余长源 香港理工大学教授

余长源，香港理工大学电子及资讯工程学系教授、博士生导师，美国光学学会会士。

主持/共同主持50多个研究项目，先后指导了20余名博士后研究员和40余名博士生。其团队曾获10次国际会议最佳论文奖，以及2014年第三届中国创新创业大赛全国总决赛生物医药行业团队组冠军。他撰写/合著了6个书籍章节及600余篇期刊/会议论文（100余篇主题/特邀报告，包括全球光通信领域以规格高、专业性强著称的美国光纤通信会议OFC）。此外，他还曾担任100余个国际学术会议的组委会/技术委员会的主席或成员，以及新加坡政府资讯通信发展管理局技术顾问委员会委员。

教育及工作经历：

1997年，获清华大学应用物理和企业管理双学士学位。

1999年，获美国迈阿密大学电子与计算机工程硕士学位，导师：麦克·R.王（Michael R. Wang）教授。

2005年， NEC美国研究所任访问研究员。

       2005年，获南加州大学电子工程系博士学位，导师：国际光纤通信领域著名专家，美国工程院院士、光学学会主席艾伦·E.维尔纳（Alan E.Willner）教授。

2005年12月至2015年12月在新加坡国立大学电子与计算机工程系任教（博士生导师），创立光电系统研究小组，并兼任新加坡科技研究局资讯通信研究院高级研究员。

期间于2007年任澳大利亚墨尔本大学访问教授。

2015年12月加入香港理工大学任教，现为电子及资讯工程学系教授（博士生导师），并继续兼职任教于新加坡国立大学。

 


 
2022年年底，亚洲通信与光子学会议在深圳举办，余长源团队李玉建等学生的论文《基于游标效应的双芯单孔光纤同时测量轴向应变和温度》获得厉鼎毅最佳论文奖。此奖项的设立是为了缅怀继高锟之后的光纤通信领域泰斗、波分复用系统之父厉鼎毅博士。他也是维尔纳教授在贝尔实验室做博士后研究时的华人导师。在余长源眼里，包括他的导师、他自己，以及他的学生在内，至少三代人，都曾受到这位大师的引领与指导。如今大师虽已驾鹤西去，但光纤领域的中华力量仍在继续活跃，中国光纤研究正在世界舞台大放光彩。“我们团队的最新论文获厉鼎毅奖，就是对大师最好的纪念。过去20多年间，我有幸在光电信息领域持续工作，亲历了历史：朋辈成长为海内外光通信的中坚力量，中国在本领域研发从相对落后到开始领先；中国通信市场从七国八制、外国通信公司在华利润超过鸦片，到华为等中国公司崛起、极大降低国人通信费用并参与国际竞争；我留美初期越洋电话每分钟几美元，到现在低成本网络连接世界各个角落。这翻天覆地的变化，是师、友、学生几代人扎扎实实干出来的。作为光纤通信传感领域的后辈，我们也将在高锟先生、厉鼎毅先生开创的道路上继续努力奋斗下去！”先后指导20多名博士后和40多名博士生，

至今已发表论文600多篇（含100多篇邀请报告，包括美国OFC），参与编写6本学术专著，拥有多项专利。曾任新加坡资讯通信发展管理局技术顾问委员会委员，多个国际学术会议的组委会/技术委员会的主席或成员。其团队曾获10次国际会议最佳论文奖，2020年广东省技术发明奖一等奖，及2014年第三届中国创新创业大赛生物医药行业团队组冠军。他是美国光学学会（Optica/OSA）会士。

 研究领域包括集成光电器件，光纤传感，光纤通讯系统与网络，及光电生物医疗仪器。


承担科研项目情况：

主持/共同主持新加坡、香港、中国大陆、美国、澳大利亚等地科研项目50余项，总经费超过一千万美元。

 

1. C. Yu, Z. Li, and S. Zhang, “Frontiers of high-speed optical fiber communications,” Frontiers of Fiber Optics, N.H. Zhu, L.-S. Yan, and J. Liu, editors, Science Press, 2011, ISBN: 978-7-03-032470-2 (in Chinese)

2. N. Liu and C. Yu, “Optical performance monitoring in optical fiber communications,” Frontiers of Fiber Optics, N.H. Zhu, L.-S. Yan, and J. Liu, editors, Science Press, 2011, ISBN: 978-7-03-032470-2 (in Chinese)

3. C. Yu, “Polarization mode dispersion monitoring,” Optical Performance Monitoring: Advanced Techniques for Next-Generation Photonic Networks, Calvin C. K. Chan, editor, Academic Press, Elsevier Inc., 2010, ISBN: 978-0-12-374950-5

4. A.E. Willner, C. Yu, Z. Pan, and Y. Xie, “WDM fiber optic communication networks,” Handbook of Optics, 3rd Edition, Vol. V, M. Bass, C.M. DeCusatis, J.M. Enoch, V. Lakshminarayanan, G. Li, C. MacDonald, V.N. Mahajan, E. Van Stryland, editors, McGraw-Hill, Inc., 2009, ISBN: 978-0-07-163313-0

5. A.E. Willner, Z. Pan, and C. Yu, “Optical performance monitoring,” Optical Fiber Telecommunications VB, Ivan P. Kaminow, Tingye Li, and Alan E. Willner, editors, Academic Press, Elsevier Inc., 2008, ISBN: 978-0-12-374172-1

6. C. Yu, “Comparison of advanced modulation formats for 40-Gbit/s DWDM optical fiber transmission systems with 50-GHz channel spacing,” Advanced Technologies for High-Speed Optical Communications, Lei Xu, editor, Research Signpost, 2007, ISBN: 81-308-0171-X

(229 Journal papers)

7. Z. Yang, W. Yuan, Z. Lian, and C. Yu, “Dual Fabry-Perot interferometers gas pressure sensor in a parallel configuration based on a hollow core Bragg fiber and the harmonic Vernier effect,” Optics Express, accepted (Q1)

8. M. Cui, Z. Wang, and C. Yu, “Refractive index sensing in helical broken-air-ring core micro-structured optical fiber,” Sensors, accepted (Q1)

9. J. Zhou, J. He, X. Lu, G. Wang, Y. Bo, G. Liu, Y. Huang, L. Li, C. Yang, H. Wang, W. Mo, W. Liu, C. Yu, and Z. Li, “100G fine-granularity flexible-rate passive optical networks based on discrete multi-tone with PAPR optimization,” IEEE/OSA Journal of Optical Communications and Networking, vol. 14, no. 11, pp. 944-950, November 2022 (Q1)

10. S. Liu, X. Du, and C. Yu, “H∞ filter-based dynamic joint carrier frequency offset and linear phase noise tracking for CO-OFDM systems,” Optics Express, vol. 30, no. 23, pp. 41157-41170, November 2022 (Q1)

11. J. J. Chen, W. Q. Wei, J. L. Qin, B. Yang, J. Z. Huang, Z. H. Wang, T. Wang, C. Yu, and J. J. Zhang, "Multi-wavelength injection locked semiconductor comb laser," Photonics Research, vol. 10, pp. 1840-1847, August 2022 (Q1)

12. A.A. Noman, J.N. Dash, X. Cheng, H.Y. Tam, and C. Yu, “Mach-Zehnder interferometer based fiber-optic nitrate sensor,” Optics Express, vol. 30, no. 21, pp. 38966-38974, October 2022 (Q1)

13. Z. Wei, Y. Zhang, S. Mao, Z. Liu, Z. Zang, C. Yu, Y. Dong, and H.Y. Fu, “Optical Uplink, D2D and IoT Links Based on VCSEL Array: Analysis and Demonstration,” IEEE/OSA Journal of Lightwave Technology, vol. 15, no. 1, pp. 5083 - 5096, Aug 2022 (Q1)

14. Z. Wei, Lei Wang, Z. Liu, C. Zhang, C.-J. Chen, M.-C. Wu, Y. Yang, C. Yu, L. Wang, and H. Fu, “Multi-gigabit visible light communication based on high-bandwidth InGaN quantum dot green micro-LED,” ACS Photonics, vol. 9, no. 7, pp. 2354-2366, June 2022 (Q1)

15. X. Du, Y. Xu, W. Huang and C. Yu, “Dynamic joint frequency offset and phase noise tracking by number-theoretic net-based Gaussian particle filter in coherent optical systems”, IEEE Communications Letters, vol. 26, no. 6, pp. 1388 - 1392, June 2022 (Q1)

16. F. Yang, W. Xu, W. Lyu, F. Tan, C. Yu and B. Dong, “High Fidelity MZI-BCG Sensor with Homodyne Demodulation for Unobtrusive HR and BP Monitoring,” IEEE Sensors Journal, vol. 22, no. 8, pp. 7798 - 7807, April 2022 (Q1)

17. S. Chen, F. Tan, W. Lyu, H. Luo, J. Yu, J. Qu, and C. Yu, "Deep learning-based ballistocardiography reconstruction algorithm on the optical fiber sensor," Optics Express, vol. 30, no. 8, pp. 13121-13133, April 2022 (Q1)

18. H. Wang, J. Zhou, J. Wei, D. Guo, Y. Feng, W. Liu, C. Yu, D. Wang, and Z. Li, “Multi-Rate Nyquist-SCM for C-Band 100 Gbit/s Signal over 50 km Dispersion-Uncompensated Link,” IEEE/OSA Journal of Lightwave Technology, vol. 40, no. 7, pp. 1930-1936, April 2022 (Q1)

19. Z. Wei, M. Li, Z. Liu, Z. Wang, C. Zhang, C. J. Chen, M. C. Wu, Y. Yang, C. Yu, and H.Y. Fu, “Parallel Mini/Micro-LEDs Transmitter: Size-dependent Effect and Gbps Multi-user Visible Light Communication,” IEEE/OSA Journal of Lightwave Technology, vol. 40, no. 8, pp. 2329-2340, April 2022 (Q1)

20. M. Xue, Q. Wang, Z. Xu, Y. Heng, C. Yu, and S. Pan, “Large Dynamic and Precision Optical Vector Analysis Assisted by SBS Processing,” IEEE/OSA Journal of Lightwave Technology, vol. 40, no. 8, pp. 2435-2440, April 2022 (Q1)

21. Y. Li, Z. Liu, Y. Liu, C. Yu, “Simultaneous measurement of axial strain and lateral stress based on cascaded interference structure,” Optics Express, vol. 30, no. 7, pp. 10942-10952, March 2022 (Q1)

22. B. Wang, W. Sun, J. Chen, and C. Yu, “Frequency domain anti-flickering in visible light communication system,” Optics Communications, vol. 516, Paper 128203, pp. 1-8, Mar 2022 (Q2)

23. Q. Zhao, W. Yuan, J. Qu, Z. Cheng, G.-D. Peng, and C. Yu, “Optical Fiber-Integrated Metasurfaces: An Emerging Platform for Multiple Optical Applications,” Nanomaterials, vol. 12, no. 5, p. 793.1-21, February 2022 (Q1)

24. J. Yu, F. Tan, C. Yu, “Few-Mode Fiber Characterization System Based on the Spatially and Spectrally Imaging Technique,” Sensors, vol. 22, no. 5, pp. 1809.1-13, February 2022 (Q1)

25. W. Xu, C. Yu, B. Dong, Y. Wang and W. Zhao, “Thin Piezoelectric Sheet Assisted PGC Demodulation of Fiber-Optic Integrated MZI and its Application in Under Mattress Vital Signs Monitoring,” IEEE Sensors Journal, vol. 22, no. 3, pp. 2151-2159, February 2022 (Q1)

26. Y. Li, P. Lu, C. Yu, “An Optical Fiber Sensor for Axial Strain, Curvature, and Temperature Measurement Based on Single-Core Six-Hole Optical Fiber,” Sensors, vol. 22, no. 2, pp.1666.1-13, February 2022 (Q1)

27. Z. Huang, Y. Tian, Y. Liu, H. Luo, X. Long, and C. Yu, “Optical performance monitoring using SOI-based spectral analysis,” Optics Express, vol. 30, no. 4, pp. 6397-6412, February 2022 (Q1)

28. W. Lyu, S. Chen, F. Tan, and C. Yu, “Vital Signs Monitoring Based on Interferometric Fiber Optic Sensors,” Photonics, vol. 9, no. 2, pp. 50.1-18, February 2022 (Q3)

29. J. Qu, H. Luo, and C. Yu, “Dual-Wavelength Polarization-Dependent Bifocal Metalens for Achromatic Optical Imaging Based on Holographic Principle,” Sensors, vol. 22, no. 5, Paper 1889, pp. 1-11, February 2022 (Q1)

30. A.A. Noman, J.N. Dash, X. Cheng, H.Y. Tam, and C. Yu, “PCF based modal interferometer for lead ion detection,” Optics Express, vol. 30, no. 4, pp. 4895-4904, February 2022 (Q1)

31. P. Zhang, B. Wang, Y. Yang, Abul Kalam Azad, K. Luo, K. Yu, C. Yu, and C. Lu, “SNR enhancement for Brillouin distributed optical fiber sensors based on asynchronous control,” Optics Express, vol. 30, no. 3, pp. 4231-4248, January 2022 (Q1)

32. Z. Wang, Q. Lu, J. Tu, Q. Xiao, Z. Li, C. Yu, and C. Lu, “Design, fabrication, and characterization of a low-index center and trench-assisted 7-ring-core 5-mode-group fiber for dense space-division multiplexing,” Optics Express, vol. 30, no. 1, pp. 650-663, January 2022 (Q1)

33. H. Luo, J. Lu, Z. Huang, C. Yu, and C. Lu, “Optimization strategy of power control for C+L+S band transmission using a simulated annealing algorithm,” Optics Express, vol. 30, no. 1, pp. 664-675, January 2022 (Q1)

34. Q. Wang, Z. Quan, S. Bi, C. Yu and P.Y. Kam, “Generalized Mutual Information Analysis for BICM-8QAM with Residual Phase Noise”, IEEE Communications Letters, vol. 25, no. 12, pp. 3819-3823, December 2021 (Q1)

35. Z. Yang, W. Yuan, C. Yu, “Hollow Core Bragg Fiber-Based Sensor for Simultaneous Measurement of Curvature and Temperature,” Sensors, vol. 21, no. 23, Paper 7956, pp. 1-11, November 2021 (Q1)

36. J. Lu, Q. Fan, G. Zhou, L. Lu, C. Yu, A.P.T. Lau, and C. Lu, “Automated training dataset collection system design for machine learning application in optical networks: An example of quality of transmission estimation,” Journal of Optical Communications and Networking, vol. 13, no. 11, pp. 289-300, November 2021 (Q1)

37. C. Shu, W. Zheng, Z. Wang, C. Yu, and Z. Huang, “Development and characterization of disposable sub-millimeter fiberoptic Raman needle probe for enhancing real-time in vivo deep tissue and biofluids Raman measurements,” Optics Letters, vol. 46, no. 20, pp. 5197-5200, October 2021 (Q1)

38. Z. Wei, Z. Liu, X. Liu, L. Wang, L. Wang, C. Yu, and H. Y. Fu, “8.75 Gbps visible light communication link using an artificial neural network equalizer and a single-pixel blue micro-LED,” Optics Letters, vol. 46, no.18, pp. 4670-4673, September 2021 (Q1)

39. Z. Jin, D. Janoschka, J. Deng, L. Ge, P. Dreher, B. Frank, G. Hu, J. Ni, Y. Yang, J. Li, C. Yu, D. Lei, G. Li, S. Xiao, S. Mei, H. Giessen, F. Heringdorf, C. Qiu, “Phyllotaxis-inspired nanosieves with multiplexed orbital angular momentum,” eLight, vol. 1, no. 1, pp. 1-11, September 2021 (new journal by Springer Nature, no CiteScore yet)

40. W. Lyu, W. Xu, F. Yang, S. Chen, F. Tan, C. Yu, “Non-invasive measurement for cardiac variations using a fiber optic sensor,” IEEE Photonics Technology Letters, vol. 33, no. 18, pp. 990-993, September 2021 (Q1)

41. W. Yuan, L. Li, Y. Wang, Z. Lian, D. Chen, C. Yu, and C. Lu, “Temperature and curvature insensitive all-fiber sensor used for human breath monitoring,” Optics Express, vol. 29, no. 17, pp. 26375-26384, August 2021 (Q1)

42. J. Zhou, C. Yang, D. Wang, Q. Sui, H. Wang, S. Gao, Y. Feng, W. Liu, Y. Yan, J. Li, C. Yu, and Z. Li, “Burst-error-propagation suppression for decision-feedback equalizer in field-trial submarine fiber-optic communications,” IEEE/OSA Journal of Lightwave Technology, vol. 39, no. 14, pp. 4601-4606, July 2021 (Q1)

43. X. Hao, W. Sun, J. Chen, and C. Yu, “Vertical measurable displacement approach for altitude accuracy improvement in 3D visible light positioning,” Optics Communications, vol. 490, Paper 126914, pp. 1-8, July 2021 (Q1)

44. J. Tu, Q. Lu, Z. Wang, S. Gao, W. Liu, C. Yu, Z. Li, and C. Lu, “Mode analysis of orbital angular momentum modes carrying multi-mode ring-core fiber,” Optics Communications, vol. 499, Paper 127314, pp.1-8, July 2021 (Q2)

45. W. Xu, S. Bian, B. Dong, Y. Shen, S. Han, C. Yu, W. Zhao, and Y. Wang, “Unobtrusive vital signs and activity monitoring based on dual mode fiber,” Optical Fiber Technology, vol. 64, Paper 102530, pp. 1-7, July 2021 (Q1)

46. X. Liu, Z. Wei, M. Li, L. Wang, Z. Liu, C. Yu, L. Wang, Y. Luo, H.F. Fu, “Experimental investigation of 16.6 Gbps SDM-WDM visible light communication based on a neural network receiver and tricolor mini-LEDs,” Optics Letters, vol. 46, no. 12, pp. 2888-2891, June 2021 (Q1)

47. Z. Wang, J. Tu, S. Gao, Z. Li, C. Yu, and C. Lu, “Transmission and generation of orbital angular momentum modes in optical fibers,” Photonics, vol. 8, no. 7, Paper 246, pp. 1-24, June 2021 (Invited) (Q3)

48. Z. Wei, Z. Liu, Z. Wang, M. Li, C.–J. Chen, M.-C. Wu, C. Yu, F.N. Khan, and H.Y. Fu, “Real-time multi-user video optical wireless transmission based on a parallel micro-LEDs bulb,” IEEE Photonics Journal, vol. 13, no. 3, Paper 7300211, pp. 1-11, June 2021 (Q2)

49. W. Yuan, Q. Zhao, L. Li, Y. Wang, and C. Yu, “Simultaneous measurement of temperature and curvature using ring-core fiber-based Mach-Zehnder interferometer,” Optics Express, vol. 29, no. 12, pp. 17915-17925, June 2021 (Q1)

50. W. Chen, Y. Zhang, H. Yang, Y. Qiu, H. Li, Z. Chen, and C. Yu, “Non-invasive measurement of vital signs based on seven-core fiber interferometer,” IEEE Sensors Journal, vol. 21, no. 9, pp. 10703-10710, May 2021 (Q1)

51. W. Yuan and C. Yu, "Dual Demodulation of Temperature and refractive index using ring core fiber based Mach-Zehnder interferometer," Micromachines, vol. 12, no. 3, pp. 258.1-8, March 2021 (Q2)

52. Q. Zhao, J. Qu, G.D. Peng, C. Yu, “Endless Single-Mode Photonics Crystal Fiber Metalens for Broadband and Efficient Focusing in Near-Infrared Range,” Micromachines, vol. 12, no. 2, pp. 219.1-11, February 2021 (Q2)

53. B. Wang, Y. Mao, I. Ashry, Y. Al-Fehaid, A. Al-Shawaf, T. K. Ng, C. Yu, and B. S. Ooi, “Towards detecting red palm weevil using machine learning and fiber optic distributed acoustic sensing,” Sensors, vol. 21, no. 5, Paper 1592, pp. 1-14, February 2021 (Q1)

54. H. Luo, Z. Huang, X. Wu, and C. Yu, “Cost-effective multi-parameter optical performance monitoring using multi-task deep learning with adaptive ADTP and AAH,” IEEE/OSA Journal of Lightwave Technology, vol. 39, no. 6, pp. 1733-1741, March 2021 (Q1)

55. J. Zhou, H. Wang, Y. Feng, W. Liu, S. Gao, C. Yu, and Z. Li, “Processing for dispersive intensity-modulation and direct-detection fiber-optic communications,” Optics Letters, vol. 46, no. 1, pp. 138-141, January 2021 (Q1)

56. A.A. Noman, J.N. Dash, X. Cheng, C.Y. Leong, H.Y. Tam, and C. Yu, “Hydrogel based Fabry-Pérot cavity for a pH sensor,” Optics Express, vol. 28, no. 26, pp. 38456-40074, December 2020 (Q1)

57. Q. Zhao, Q. Hao, C. Yu, Y. Luo, and G.D. Peng, “Influence of liquid nitrogen cooling on the spectral performance of BAC-P in bismuth-doped phosphosilicate fibers under liquid nitrogen temperature,” Optical Materials Express, vol. 10, no. 12, pp. 3235-3244, December 2020 (Q1)

58. K. Luo, B. Wang, N. Guo, K. Yu, C. Yu, and C. Lu, “Enhancing SNR by anisotropic diffusion for brillouin distributed optical fiber sensors,” IEEE/OSA Journal of Lightwave Technology, vol. 38, no. 20, pp. 5844-5852, October 2020 (Q1)

59. Q. Zhao, Q. Hao, Y. Luo, X. Li, S. Cui, F. Tan, C. Yu, and G.D. Peng, “Photo-induced bleaching and thermally stimulated recovery of BAC-P in Bi-doped phosphosilicate fibers,” Optics Letters, vol. 45, no. 19, pp. 5389-5392, October 2020 (Q1)

60. J. Huo, X. Zhou, C. Shang, W. Huangfu, J. Yuan, H. Ning, K. Long, C. Yu, A.P.T. Lau, and C. Lu, “Theoretical and numerical analyses for PDM-IM signals using Stokes vector receivers,” Science China Information Sciences, vol. 63, no. 10, pp. 1-9, October 2020 (Q1)

61. S. Chen, F. Tan, W. Lyu, and C. Yu, “Ballistocardiography monitoring system based on optical fiber interferometer aided with heartbeat segmentation algorithm,” Biomedical Optics Express, vol. 11, no. 10, pp. 5458-5469, October 2020 (Q1)

62. H. Wang, J. Zhou, D. Guo, Y.H. Huang, C. Yu, W. Liu, and Z. Li, “Adaptive channel-matched detection for C-band 64-Gbit/s optical OOK system over 100-km dispersion-uncompensated link,” IEEE/OSA Journal of Lightwave Technology, vol. 38, no. 18, pp. 5048-5055, September 2020 (Q1)

63. J. Tu, S. Gao, Z. Wang, Z. Liu, W. Li, C. Du, W. Liu, Z. Li, C. Yu, H. Tam, and C. Lu, “Bend-insensitive grapefruit-type holey ring-core fiber for weakly-coupled OAM mode division multiplexing transmission,” IEEE/OSA Journal of Lightwave Technology, vol. 38, no. 16, pp. 4497-4503, August 2020 (Q1)

64. M. Xue, M. Lv, Q. Wang, C. Yu, and S. Pan, “Ultrahigh-resolution optoelectronic vector analysis utilizing photonics-based frequency up- and down-conversions,” IEEE/OSA Journal of Lightwave Technology, vol. 38, no. 15, pp. 3859-3865, August 2020 (Q1)

65. W. Xu, Y. Shen, C. Yu, B. Dong, W. Zhao, Y. Wang, “Long Modal Interference in Multimode Fiber and its Application in Vital Signs Monitoring,” Optics Communications, vol. 474, Paper 126100, pp. 1-7, May 2020 (Q2)

66. F. Tan, W. Lyu, S. Chen, Z. Liu, and C. Yu, “Contactless vital signs monitoring based on few-mode and multi-core fibers,” Opto-Electronic Advances, vol. 3, no. 5, Paper 190034, pp. 1-12, May 2020 (Invited) (Q1)

67. J. Gao, X. Zhou, Q. Fan, D. Lu, J. Huo, J. Yuan, K. Long, C. Yu, A.P.T. Lau, and C. Lu, “Modulation format and baud-rate identification using asynchronous single channel sampling based on CNN,” Optics Communications, vol. 463, Paper 125363, pp. 1-5, May 2020 (Q2)

68. X. You, Y. Zhong, J. Chen, and C. Yu, “Mobile channel estimation based on decision feedback in vehicle-to-infrastructure visible light communication systems,” Optics Communications, vol. 462, Paper 125261, pp. 1-7, May 2020 (Q2)

69. B. Wang, N. Guo, L. Wang, C. Yu, and C. Lu, “Robust and fast Temperature Extraction for Brillouin Optical Time-Domain Analyzer by Using Denoising Autoencoder-Based Deep Neural Networks,” IEEE Sensors Journal, vol. 20, no. 7, pp. 3614-3620, April 2020 (Q1)

70. W. Wang, Y. Liu, X. Du, X. Zhong, C. Yu, and X. Chen, “Ultra-stable and real-time demultiplexing system of strong fiber Bragg grating sensors based on low-frequency optoelectronic oscillator,” IEEE/OSA Journal of Lightwave Technology, vol. 38, no. 4, pp. 981-988, February 2020 (Q1)

71. Z. Wang, J. Tu, Z. Liu, C. Yu, and C. Lu, “Design of weakly coupled two-mode hollow-core antiresonant fiber with low loss,” IEEE/OSA Journal of Lightwave Technology, vol. 38, no. 4, pp. 864-874, February 2020 (Q1)

72. Z. Jiang, L. Kang, T. Yue, H. Xu, Y. Yang, Z. Jin, C. Yu, W. Hong, D.H. Werner and C.W. Qiu, “A Single Noninterleaved Metasurface for High-Capacity and Flexible Mode Multiplexing of Higher-Order Poincaré Sphere Beams,” Advanced Materials, vol. 32, no. 6, Paper 1903983, pp. 1-7, February 2020 (Impact factor: 25.809) (Q1)

73. J. Zhou, H. Wang, L. Liu, C. Yu, Y. Feng, S. Gao, W. Liu, and Z. Li, “C-band 56 Gbit/s on/off keying system over a 100 km dispersion-uncompensated link using only receiver-side digital signal processing,” Optics Letters, vol. 45, no. 3, pp. 758-761, February 2020 (Q1)

74. H. Wang, J. Zhou, W. Liu, J. Li, X. Huang, L. Liu, W. Liang, C. Yu, F. Li, and Z. Li, “BGD-based Adam algorithm for time-domain equalizer in PAM-based optical interconnects,” Optics Letters, vol. 45, no. 1, pp. 141-144, January 2020 (Q1)

75. B. Wang, L. Wang, N. Guo, Z. Zhao, C. Yu, and C. Lu, “Long-distance BOTDA sensing systems using video-BM3D denoising for both static and slowly varying environment,” Optics Express, vol. 27, no. 25, pp. 36100-36113, December 2019 (Q1)

76. F. Tan, S. Chen, W. Lyu, Z. Liu, C. Yu, and H.Y. Tam, “Non-invasive human vital signs monitoring based on twin-core optical fiber sensors,” Biomedical Optics Express, vol. 10, no. 11, pp. 5940-5952, November 2019 (Q1)

77. D. Lu, X. Zhou, J. Huo, J. Gao, Y. Yang, K. He, J. Yuan, K. Long, C. Yu, A.P.T. Lau, and C. Lu, “Theoretical CSPR analysis and performance comparison for four single-sideband modulation schemes with Kramers-Kronig receiver,” IEEE Access, vol. 7, pp. 166257-166267, November 2019 (Q2)

78. J. Gao, X. Zhou, J. Huo, K. He, K. Zhong, J. Yuan, K. Long, C. Yu, A.P.T. Lau, and C. Lu, “Joint baud-rate and modulation format identification based on asynchronous delay-tap plots analyzer by using convolutional neural network,” Optics Communications, vol. 450, pp. 97-102, November 2019 (Q2)

79. W. Chen, M. Xue, D. Zhu, C. Yu, C. Lu, and S. Pan, “Optical vector analysis with improved accuracy and enhanced dynamic range,” IEEE Photonics Technology Letters, vol. 31, no. 19, pp. 1565-1568, October 2019 (Q1)

80. L. Jin, Y.W. Huang, Z. Jin, R.C. Devlin, Z. Dong, S. Mei, M. Jiang, W.T. Chen, Z. Wei, H. Liu, J. Teng, A. Danner, X. Li, S. Xiao, S. Zhang, C. Yu, J.K.W. Yang, F. Capasso and C.W. Qiu, “Dielectric multi-momentum meta-transformer in the visible,” Nature Communications, 2019, vol. 10, no. 1, pp. 1-6, October 2019 (Impact factor: 11.880) (Q1)

81. J. Zhou, H. Wang, J. Wei, L. Liu, X. Huang, S. Gao, W. Liu, J. Li, C. Yu, Z. Li, “Adaptive moment estimation for polynomial nonlinear equalizer in PAM8-based optical interconnects,” Optics Express, vol. 27, no. 22, pp. 32210-32216, October 2019 (Q1)

82. H. Wang, J. Zhou, Y. Wang, J. Wei, W. Liu, C. Yu, and Z. Li, “Optimization Algorithms of Neural Networks for Traditional Time-Domain Equalizer in Optical Communications,” Applied Sciences, vol. 9, no. 18, Paper 3907, pp. 1-10, September 2019 (Q2)

83. X. Cheng, Y. Liu, and C. Yu, “Gas pressure sensor based on BDK-doped polymer optical fiber,” Micromachines, vol. 10, no. 11, Paper 717, pp. 1-8, October 2019 (Q2)

84. X. You, J. Chen, and C. Yu, “Performance of location-based equalization for OFDM indoor visible light communications,” IEEE Transactions on Cognitive Communications and Networking, vol. 5, no. 4, pp. 1229-1243, September 2019 (Q1)

85. C. Shan, J. Zhou, D. Guo, H. Wang, L. Liu, Q. Wang, W. Liu, and C. Yu, “Hartley-Domain DD-FTN Algorithm for ACO-SCFDM in Optical-Wireless Communications,” IEEE Photonics Journal, vol. 11, no. 4, Paper 7904509, pp. 1-9, August 2019 (Q2)

86. W. Yuan, H. Qian, Y. Liu, Z. Wang, and C. Yu, “Highly sensitive temperature and humidity sensor based on Carbon nanotube-assisted mismatched single-mode fiber structure,” Micromachines, vol. 10, no. 8, Paper 521, pp. 1-9, August 2019 (Q2)

87. J. Tu, Z. Liu, S. Gao, Z. Wang, J. Zhang, B. Zhang, J. Li, W. Liu, H.Y. Tam, Z. Li, C. Yu, and C. Lu, “Ring-core fiber with negative curvature structure supporting orbital angular momentum modes,” Optics Express, vol. 27, no. 15, pp. 20358-20372, July 2019 (Q1)

88. Y. Liu and C. Yu, “Highly stretchable hybrid silica/polymer optical fiber sensors for large-strain and high-temperature application,” Optics Express, vol. 27, no. 15, pp. 20107-20116, July 2019 (Q1)

89. J. Zhou, Y. Qiao, X. Huang, C. Yu, Q. Cheng, X. Tang, M. Guo, W. Liu, and Z. Li, “Joint FDE and MLSD algorithm for 56-Gbit/s optical FTN-PAM4 system using 10G-class optics,” IEEE/OSA Journal of Lightwave Technology, vol. 37, no. 13, pp. 3343-3350, July 2019 (Q1)

90. S. Li, M. Xue, T. Qing, C. Yu, L. Wu, and S. Pan, “Ultrafast and ultrahigh-resolutio n optical vector analysis using linearly frequency-modulated waveform and dechirp processing,” Optics Letters, vol. 44, no. 13, pp. 3322-3325, July 2019 (Q1)

91. W. Wang, L. Huang, J. Tao, H. Zhu, X. Du, L. Hao, C. Yu, and X. Chen, “Tunable multiple-passband microwave photonic filter based on external optical injected Fabry-Pérot laser,” Optics Express, vol. 27, no. 9, pp. 12491-12503, April 2019 (Q1)

92. X. Du, P.Y. Kam, and C. Yu, “Joint timing and frequency synchronization in coherent optical OFDM systems,” Frontiers of Optoelectronics, vol. 12, no. 1, pp. 4-14, March 2019 (Invited) (Q2)

93. P. Zhu, J. Wang, F. Rao, C. Yu, G. Zhou, and X. Huang, “Differential Fresnel-reflection-based fiber biochemical sensor with temperature self-compensation for high-resolution measurement of Cd2+ concentration in solution,” Sensors and Actuators B: Chemical, vol. 282, pp.644-649, March 2019 (Q1)

94. X. You, J Chen, and C. Yu, “Cold-start of coherent optical receivers with decision-aided maximum likelihood phase estimation scheme,” Optics Communications, vol. 435, pp. 41-45, March 2019 (Q2)

95. B. Wang, L. Wang, N. Guo, Z. Zhao, C. Yu, and C. Lu, “Deep neural networks assisted BOTDA for simultaneous temperature and strain measurement with enhanced accuracy,” Optics Express, vol. 27, no. 3, pp. 2530-2543, February 2019 (Q1)

96. S. Dong, B. Dong, C. Yu, and Y. Guo, “Cascaded fiber up-taper modal interferometer and its application as fiber sensor,” IEEE/OSA Journal of Lightwave Technology, vol. 37, no. 11, pp. 2675-2680, June 2019 (Q1)

97. Z. Jin, S. Mei, S. Chen, Y. Li, C. Zhang, Y. He, X. Yu, C. Yu, J.K.W. Yang, B. Luk’yanchuk, S. Xiao, and C.W. Qiu, “Complex inverse design of meta-optics by segmented hierarchical evolutionary algorithm,” ACS Nano, vol. 13, no. 1, pp. 821-829, January 2019 (Impact factor: 13.90) (Q1)

98. J. Zhou, Y. Qiao, C. Yu, M. Guo, X. Tang, W. Liu, S. Chun, and Z. Li, “Joint Hartley-domain and time-domain equalizer for a 200-G (4× 56-Gbit/s) optical PAM-4 system using 10G-class optics,” Optics Express, vol. 26, no. 26, pp. 34451-34460, December 2018 (Q1)

99. J. Tu, B. Zhang, Z. Liu, X. Zhou, K. Long, Z. Li, C. Lu, and C. Yu, “Chalcogenide-glass nested anti-resonant nodeless fibers in mid-infrared region,” IEEE/OSA Journal of Lightwave Technology, vol. 36, no. 11, pp. 5244-5253, November 2018 (Q1)

100. H. Ren, Z. Wang, S. Du, Y. He, J. Chen, S. Han, C. Yu, C. Xu, and J. Yu, “Performance improvement of NOMA visible light communication system by adjusting superposition constellation: a convex optimization approach,” Optics Express, vol. 26, no. 23, pp. 29796-29806, November 2018 (Q1)

101. X. You, J. Chen and C. Yu, “Efficient indoor data transmission with full dimming control in hybrid visible light/infrared communication systems,” IEEE Access, vol. 6, pp. 77675-77684, November 2018 (Q2)

102. F. Ni, Z. Xie, Q. Ma, J. Tao, L. Wu, C. Yu, and X. Huang, “Variable optical attenuator and modulator based on a graphene plasmonic gap waveguide,” Optics Communications, vol. 426, pp. 70-74, November 2018 (Q2)

103. J. Huo, X. Zhou, K. Zhong, J. Tu, H. Wei, J. Yuan, Z. Kang, K. Long, C. Yu, A.P.T. Lau, and C. Lu, “Experimental study of single channel 100 Gbit/s PAM4 transmission over 40 km using 17 GHz EML and APD at O band,” Optical Fiber Technology, vol. 45, pp. 411-414, November 2018 (Q1)

104. X. Shen, J. Huo, X. Zhou, K. Zhong, J. Yuan, J. Tu, K. Long, C. Yu, A.P.T. Lau, and C. Lu, “Performance comparison among three different Stokes vector direct-detection receivers,” Chinese Optics Letters, vol. 16, no. 10, Paper 100605, pp.1-6, October 2018 (Q2)

105. J. Huo, X. Zhou, K. Zhong, J. Tu, J. Yuan, C. Guo, K. Long, C. Yu, A.P.T. Lau, and C. Lu, “Transmitter and receiver DSP for 112 Gbit/s PAM-4 amplifier-less transmissions using 25G-class EML and APD,” Optics Express, vol. 26, no. 18, pp. 22673-22686, September 2018 (Q1)

106. F. Tan, Z. Liu, J. Tu, C. Yu, C. Lu, and H.Y. Tam, “Torsion sensor based on inter-core mode coupling in seven-core fiber,” Optics Express, vol. 26, no. 16, pp. 19835-19844, August 2018 (Q1)

107. Y. Li, T. Song, M. Gurusamy, C. Yu, and P.Y. Kam, “Enhanced adaptive DA-ML carrier phase estimator and its application to accurate laser linewidth and SNR estimation,” Optics Express, vol. 26, no. 12, pp. 14817-14831, June 2018 (Q1)

108. N. Zhang, W. Xu, S. You, C.C. Yu, C. Yu, B. Dong, and K, Li, “Simultaneous measurement of refractive index, strain and temperature using a tapered structure based on SMF,” Optics Communications, vol. 410, pp. 70-74, March 2018 (Q2)

109. S. Dong, B. Dong, C. Yu, and Y. Guo, “High sensitivity optical fiber curvature sensor based on cascaded fiber interferometer,” IEEE/OSA Journal of Lightwave Technology, vol. 36, no. 4, pp. 1125-1130, February 2018 (Q1)

110. Y. Li, M. Wu, X. Du, Z. Xu, M. Gurusamy, C. Yu, and P.Y. Kam, “Nonlinear phase noise tolerance for coherent optical systems using soft-decision-aided ML carrier phase estimation enhanced with constellation partitioning,” Optics Communications, vol. 409, pp. 45-51, February 2018 (Q2)

111. X. Li, M. Luo, Y. Qiu, A. Alphones, W. Zhong, C. Yu, and Q. Yang, “Independent component analysis based digital signal processing in coherent optical fiber communication systems,” Optics Communications, vol. 409, pp. 13-22, February 2018 (Q2)

112. K. Zhong, X. Zhou, J. Huo, C. Yu, C. Lu, and A.P.T. Lau, “Digital signal processing for short-reach optical communications: a review of current technologies and future trends,” IEEE/OSA Journal of Lightwave Technology, vol. 36, no. 2, pp. 377-400, January 2018 (Invited) (Q1)

113. C. Yu, B. Wang, L. Wang, and C. Lu, “The application of neural network in brillouin optical time domain analyzer for temperature extraction,” Study on Optical Communications, no. 204, pp. 1-6, December 2017 (Invited)

114. Y. Xu, Z. Wang, P. Liu, J. Chen, S. Han, C. Yu, and J. Yu, “Accuracy analysis and improvement of visible light positioning based on VLC system using orthogonal frequency division multiple access,” Optics Express, vol. 25, no. 15, pp. 32618-32630, December 2017 (Q1)

115. C. Hao, Z. Nie, H. Ye, H. Li, Y. Luo, R. Feng, X. Yu, F. Wen, Y. Zhang, C. Yu, J. Teng, B. Luk’yanchuk, and C.W. Qiu, “Three-dimensional supercritical resolved light-induced-magnetic holography,” Science Advances, vol. 3, Paper 1701398, pp.1-9, October 2017 (Impact Factor 12.80) (Q1)

116. J. Huo, X. Zhou, K. Zhong, T. Gui, F. Tan, J. Tu, J. Yuan, H. Zhang, K. Long, C. Yu, A.P.T. Lau, and C. Lu, “100-Gb/s 80-km transmission of PIM-SSB-OFDM at C-band using a single-end photodetector,” Optical Engineering, vol. 56, no. 10, Paper 106116, pp.1-5, October 2017 (Q2)

117. X. Zhou, J. Huo, K. Zhong, F.N. Khan, T. Gui, H. Zhang, J. Tu, J. Yuan, K. Long, C. Yu, A.P.T. Lau, and C. Lu, “Single channel 50 Gbit/s transmission over 40km SSMF without optical amplification and in-line dispersion compensation using a Single-End PD-Based PDM-SSB-DMT system,” IEEE Photonics Journal, vol. 9, no. 5, paper 7906911, pp. 1-11, October 2017 (Q2)

118. H. Zheng, Z. Xu, C. Yu, and M. Gurusamy, “A 3-D high accuracy positioning system based on visible light communication with novel positioning algorithm,” Optics Communications, vol. 396, pp. 160-168, August 2017 (Q2)

119. F.N. Khan, K. Zhong, X. Zhou, W.H. Al-Arashi, C. Yu, C. Lu, and A.P.T. Lau, “Joint OSNR monitoring and modulation format identification in digital coherent receivers using deep neural networks,” Optics Express, vol. 25, no. 15, pp. 17767-17776, July 2017 (Q1)

120. X. You, J. Chen, C. Yu, and H. Zheng, “Time domain reshuffling for OFDM based indoor visible light communication systems,” Optics Express, vol. 25, no. 10, pp. 11606-11621, May 2017 (Q1)

121. L. Wang, N. Guo, C. Jin, K. Zhong, X. Zhou, J. Yuan, B. Zhou, C. Yu, H.Y. Tam, and C. Lu, “Coherent BOTDA using Phase- and Polarization-Diversity Heterodyne Detection and Embedded Digital Signal Processing,” IEEE Sensors Journal, vol. 17, no. 12, pp. 3728-3734, April 2017 (Q1)

122. K. Tan, Y. Huang, G.Q. Lo, C. Lee, and C. Yu, “Experimental realization of an O-band compact polarization splitter and rotator,” Optics Express, vol. 25, no. 14, pp. 3234-3241, February 2017 (Q1)

123. H. Zheng, J. Chen, C. Yu, and G. Mohan, “Inverse design of LED arrangement for visible light communication systems,” Optics Communications, vol. 382, pp. 615-623, January 2017 (Q2)

124. X. You, J. Chen, P. Wang, C. Yu, and P. Li, “Flexible decision-aided maximum likelihood phase estimation in coherent optical phase-shift-keying systems,” Photonic Network Communications, vol. 32, no. 2, pp. 204-212, October 2016 (Q2)

125. K. Zhong, X. Zhou, Y. Wang, L. Wang, J. Yuan, C. Yu, A.P.T. Lau, and C. Lu, “Experimental demonstration of 608Gbit/s short reach transmission employing half-cycle 16QAM Nyquist-SCM signal and direct detection with 25Gbps EML,” Optics Express, vol. 24, no. 22, pp. 25057-25067, October 2016 (Q1)

126. F.N. Khan, K. Zhong, W.H. Al-Arashi, C. Yu, C. Lu, and A.P.T. Lau, “Modulation format identification in coherent receivers using deep machine learning,” IEEE Photonics Technology Letters, vol. 28, no. 17, pp. 1886-1889, September 2016 (Q1)

127. B. Dong, Z. Shen, C. Yu, Y. Wang, “Modal excitations in fully and partially ethanol-filled photonic bandgap fibers and their applications as fiber sensors,” IEEE/OSA Journal of Lightwave Technology, vol. 34, no. 16, pp. 3853-3858, August 2016 (Q1)

128. P. Wang, J. Chen, X. You, Z. Ma, X. Liu, and C. Yu, “Flexible decision-aided maximum likelihood phase estimation for optical coherent QAM signals,” Acta Optica Sinica, vol. 36, no. 8, August 2016 (Q3)

129. J. Zhou, C. Yu, G. Mohan, and H. Kim, “25-Gb/s OOK transmission using 1.5-µm 10G‑class VCSEL for optical access network,” IEEE/OSA Journal of Lightwave Technology, vol. 34, no. 16, pp. 3790-3795, August 2016 (Q1)

130. X. Du, J. Zhang, Y. Li, C. Yu, and P.Y. Kam, “Efficient Joint Timing and Frequency Synchronization Algorithm for Coherent Optical OFDM Systems,” Optics Express, vol. 24, no. 17, pp. 19967-19977, August 2016 (Q1)

131. K. Tan, Y. Huang, G.Q. Lo, C. Lee, and C. Yu, “Compact highly-efficient polarization splitter and rotator based on 90° bends,” Optics Express, vol. 24, no. 13, pp. 14506-14512, June 2016 (Q1)

132. Y. Fan, J. Chen, Y. Zhang, and C. Yu, “Performance of ADC resolution-limited optical coherent receivers with DA-ML carrier phase estimation,” Photonic Network Communications, vol. 31, no. 2, pp. 285-293, April 2016 (Q2)

133. B. Dong, Y. Peng, Y. Wang, C.Yu, “Mode division multiplexing in a fiber modal interferometer for dual parameters measurement,” IEEE Photonics Technology Letters, vol. 28, no. 2, pp. 143-146, January 2016 (Q1)

134. B. Dong, C. Yu, Y. Wang, “Intensity-modulated micro-displacement sensor with an embedded fiber dual cladding modes interferometer,” Sensors and Actuators A: Physical, vol. 236, pp.334-337, December 2015 (Q1)

135. B. Dong, B. Zhang, J. Ng, Y. Wang, and C.Yu, “Ultrahigh-sensitivity fiber acoustic sensor with a dual cladding modes fiber up-taper interferometer,” IEEE Photonics Technology Letters, vol. 27, no. 21, pp. 2234 – 2237, November 2015 (Q1)

136. B. Dong, Y. Ge, Y. Wang, C. Yu, “High extinction-ratio dual thin-taper fiber interferometer fabricated by arc-discharge and its performance as sensors,” Optics Communications, vol. 355, pp. 225-229, November 2015 (Q2)

137. F.N. Khan, Y. Yu, M.C. Tan, W.H. Al-Arashi, C. Yu, A.P.T. Lau, and C. Lu, “Experimental demonstration of joint OSNR monitoring and modulation format identification using asynchronous single channel sampling,” Optics Express, vol. 23, no. 23, pp. 30337-30346, November 2015 (Q1)

138. X. Li, W.D. Zhong, A. Alphones, C. Yu, and Z. Xu, “Improving performance of channel equalization in RSOA-based WDM-PON by QR decomposition,” Optics Express, vol. 23, no. 21, pp. 27299-27305, October 2015 (Q1)

139. Q. Hu, C. Yu, P.Y. Kam, and H. Kim, “Optimum linewidth of spectrum-sliced incoherent light source using a gain-saturated semiconductor optical amplifier,” IEEE/OSA Journal of Lightwave Technology, vol. 33, no. 17, pp. 3744-3750, September 2015 (Q1)

140. Y. Yu, B. Dong, and C. Yu, “Optical signal-to-noise ratio monitoring using a Sagnac interferometer based on fiber birefringence,” IEEE Photonics Technology Letters, vol. 27, no. 18, pp. 1899-1902, September 2015 (Q1)

141. J. Zhou, C. Yu, and H. Kim, “Transmission performance of OOK and 4-PAM signals using directly modulated 1.5-μm VCSEL for optical access network,” IEEE/OSA Journal of Lightwave Technology, vol. 33, no. 15, pp. 3243-3249, August 2015 (Q1)

142. X. You, J. Chen, H. Zheng, and C. Yu, “Efficient data transmission using MPPM dimming control in indoor visible light communication,” IEEE Photonics Journal, vol. 7, no. 4, paper 7902512, pp. 1-12, August 2015 (Q2)

143. Y. Yu and C. Yu, “Optical signal to noise ratio monitoring using variable phase difference phase portrait with software synchronization,” Optics Express, vol. 23, no. 9, pp. 11284-11289, May 2015 (Q1)

144. S. Cao, P.Y. Kam, C. Yu, and X. Cheng, “Performance investigation of pilot-aided log-likelihood ratios for LDPC coded CO-OFDM,” IEEE/OSA Journal of Lightwave Technology, vol. 33, no. 10, pp. 1961-1970, May 2015 (Q1)

145. T. Lei, M. Zhang, Y. Li, P. Jia, G.N. Liu, X. Xu, Z. Li, C. Min, J. Lin, C.Yu, H. Niu, and X. Yuan, “Massive individual orbital angular momentum channels for multiplexing enabled by Dammann gratings,” Light: Science & Applications, vol. 4, no. e257, pp. 1-7, March 2015 (Impact Factor 14.00) (Q1)

146. C. Jin, N. Guo, Y. Feng, L. Wang, H. Liang, J. Li, Z. Li, C. Yu, and C. Lu, “Scanning-free BOTDA based on ultra-fine digital optical frequency comb,” Optics Express, vol. 23, no. 4, pp. 5277-5284, February 2015 (Q1)

147. Q. Hu, C. Yu, and H. Kim, “5-Gb/s upstream transmission using an RSOA seeded by ultra-narrow spectrum-sliced incoherent light,” Optical Fiber Technology, vol. 21, pp. 137-140, January 2015 (Q1)

148. X. Zhang, Z. Li, J. Li, C. Yu, A.P.T. Lau, and C. Lu, “Low-cost coherent receiver for long-reach optical access network using single-ended detection,” Optics Letters, vol. 39, no. 18, pp. 5248-5250, September 2014 (Q1)

149. C. Yu, P.Y. Kam, and S. Cao, “Carrier recovery in coherent receiver of optical orthogonal frequency division multiplexing system,” Frontiers of Optoelectronics, vol. 7, no. 3, pp. 348-358, September 2014 (Invited) (Q2)

150. X. Li, W.D. Zhong, A. Alphones, C. Yu, and Z. Xu, “Channel Equalization in Optical OFDM Systems Using Independent Component Analysis,” IEEE/OSA Journal of Lightwave Technology, vol. 32, no. 18, pp. 3206-3214, September 2014 (Q1)

151. S. Cao, P.Y. Kam, C. Yu, and X. Cheng, “Pilot-tone assisted log-likelihood ratio for LDPC coded CO-OFDM system,” IEEE Photonics Technology Letters, vol. 26, no. 15, pp. 1577-1580, August 2014 (Q1)

152. X. You, J. Chen, M. Feng, and C. Yu, “Analysis of time domain reshuffling based on dc-biased optical OFDM,” Acta Photonica Sinica, vol. 43, no. 7, July 2014 (Q4)

153. S. Hu, L. Li, X. Yi, and C. Yu, “Ultraflat widely tuned single bandpass filter based on stimulated Brillouin scattering,” IEEE Photonics Technology Letters, vol. 26, no. 14, pp. 1466-1469, July 2014 (Q1)

154. Y. Yu and C. Yu, “Dispersion insensitive optical signal to noise ratio monitoring of PDM signal by using uncorrelated signal power,” Optics Express, vol. 22, no. 11, pp. 12823-12828, June 2014 (Q1)

155. Y. Yu, B. Zhang, and C. Yu, “Optical signal to noise ratio monitoring using single channel sampling technique,” Optics Express, vol. 22, no. 6, pp. 6874-6880, March 2014 (Q1)

156. J. Liu, Z. Li, and C. Yu, “Complementary frequency shifter based on polarization modulator used for generation of a high-quality frequency-locked multicarrier,” Optics Letters, vol. 39, no. 6, pp. 1513-1516, March 2014 (Q1)

157. B. Dong, N. Chen, G. Cheng, C. Yu, and Y. Gong, “Optical pump induced thermal sensitivity reduction in a minimized Er/Yb-codoped-fiber Mach–Zehnder interferometer,” IEEE/OSA Journal of Lightwave Technology, vol. 32, no. 5, pp. 917-921, March 2014 (Q1)

158. Z. Xu, P.Y. Kam, and C. Yu, “Adaptive Maximum Likelihood Sequence Detection for QPSK Coherent Optical Communication System,” IEEE Photonics Technology Letters, vol. 26, no. 6, pp. 583-586, March 2014 (Q1)

159. X. Li, W.D. Zhong, A. Alphones and C. Yu, “Channel Equalization Using Independent Component Analysis in PDM-CO-OFDM,” IEEE Photonics Technology Letters, vol. 26, no. 5, pp. 497-500, March 2014 (Q1)

160. X. Li, W.D. Zhong, A. Alphones and C. Yu, “Time-Domain Adaptive Decision-Directed Channel Equalizer for RGI-DP-CO-OFDM,” IEEE Photonics Technology Letters, vol. 26, no. 3, pp.285-288, February 2014 (Q1)

161. W. Xu, W.B. Huang, X.G. Huang, and C. Yu, “A simple fiber-optic humidity sensor based on extrinsic Fabry–Perot cavity constructed by cellulose acetate butyrate film,” Optical Fiber Technology, vol. 19, no. 6, pp. 583–586, December 2013 (Q1)

162. S. Cao, P.Y. Kam, and C. Yu, “Time-domain blind ICI mitigation for non-constant modulus format in CO-OFDM,” IEEE Photonics Technology Letters, vol. 25, no. 24, pp. 2490-2493, December 2013 (Q1)

163. X. Li, W.D. Zhong, A. Alphones and C. Yu, “Fiber nonlinearity tolerance of APSK modulated DFT-S OFDM systems,” IEEE Photonics Technology Letters, vol. 25, no. 23, pp. 2304-2307, December 2013 (Q1)

164. J. Liu, N. Guo, Z. Li, C. Yu, and C. Lu, “Ultrahigh-Q microwave photonic filter with tunable Q value utilizing cascaded optical-electrical feedback loops,” Optics Letters, vol. 38, no. 21, pp. 4304-4307, November 2013 (Q1)

165. X. Li, W.D. Zhong, A. Alphones and C. Yu, “Pilot-aided channel equalization in RGI-PDM-CO-OFDM systems,” IEEE Photonics Technology Letters, vol. 25, no. 19, pp. 1924-1927, October 2013 (Q1)

166. S. Cao, C. Yu, and P.Y. Kam, “A performance investigation of correlation-based and pilot-tone-assisted frequency offset compensation method for CO-OFDM,” Optics Express, vol. 21, no. 19, pp. 22847-22853, September 2013 (Q1)

167. X. Li, A. Alphones, W.D. Zhong and C. Yu, “Investigation of PMD in direct-detection optical OFDM with zero padding,” Optics Express, vol. 21, no. 18, pp. 20851-20856, September 2013 (Q1)

168. D. Huang, T.H. Cheng, and C. Yu, “Study on phase interpolation filters for coherent optical communications,” IEEE Photonics Technology Letters, vol. 25, no. 17, pp. 1731-1733, September 2013 (Q1)

169. Y. Hong, J. Chen, Z. Wong, and C. Yu, “Performance of a precoding MIMO system for decentralized multiuser indoor visible light communications,” IEEE Photonics Journal, vol. 5, no. 4, Paper 7800211, pp. 1-12, August 2013 (Q2)

170. C. Jin, Y. Bao, Z. Li, T. Gui, H. Shang, X. Feng, J. Li, X. Yi, C. Yu, G. Li, and C. Lu, “High-resolution optical spectrum characterization using optical channel estimation and spectrum stitching technique,” Optics Letters, vol. 38, no. 13, pp. 2314-2316, July 2013 (Q1)

171. Z. Li, H. Shang, J. Li, C. Yu, X. Feng, B. Guan, and C. Lu, “Broadband and linear photonic RF phase shifter based on DBR fiber lasers and polarization sensitive optical phase modulator,” Optics Communications, vol. 297, pp. 55-58, June 2013 (Q2)

172. S. Cao, P.Y. Kam, and C. Yu, “Pilot-aided log-likelihood ratio for LDPC coded MPSK-OFDM transmission,” IEEE Photonics Technology Letters, vol. 25, no. 6, pp. 594-597, March 2013 (Q1)

173. B. Zhang, H. Zhang, C. Yu, X. Cheng, Y.K. Yeo, P.Y. Kam, J. Yang, H. Zhang, Y.-H. Wen, and K.-M. Feng, “An all-optical modulation format conversion for 8QAM based on FWM in HNLF,” IEEE Photonics Technology Letters, vol. 25, no. 4, pp. 327-330, February 2013 (Q1)

174. D. Huang, T.H. Cheng, and C. Yu, “Accurate two-stage frequency offset estimation for coherent optical systems,” IEEE Photonics Technology Letters, vol. 25, no. 2, pp. 179-182, January 2013 (Q1)

175. H. Zhang, B. Zhang, C. Yu, and P.Y. Kam, “Experiment on coherent optical RZ 8-star QAM systems using decision-aided maximum likelihood phase estimation,” IEEE Photonics Technology Letters, vol. 24, no. 23, pp. 2139-2141, December 2012 (Q1)

176. S. Cao, P.Y. Kam, and C. Yu, “Decision-aided, pilot-aided, decision-feedback phase estimation for coherent optical OFDM systems,” IEEE Photonics Technology Letters, vol. 24, no. 22, pp. 2067-2069, November 2012 (Q1)

177. Z. Wang, W. Zhong, and C. Yu, “Performance improvement of OOK free-space optical communication systems by coherent detection and dynamic decision threshold in atmospheric turbulence conditions,” IEEE Photonics Technology Letters, vol. 24, no. 22, pp. 2035-2037, November 2012 (Q1)

178. Z. Wang, W. Zhong, C. Yu, J. Chen, C.P. Shin, and W. Chen, “Performance of dimming control scheme in visible light communication system,” Optics Express, vol. 20, no. 17, pp. 18861-18868, August 2012 (Q1)

179. B. Dong, J. Hu, C. Yu, and J. Hao, “Multi-wavelength Q-switched erbium doped fiber laser with a short carbon nanotube based saturable absorber,” Optics Communications, vol. 285, no. 18, pp. 3864-3867, August 2012 (Q2)

180. B. Dong, J. Hu, Z. Chen, and C. Yu, “Long-distance fiber sensor system based on the second-order Raman pump and amplification,” Applied Physics B, vol. 108, no. 1, pp. 57-60, July 2012 (Q2)

181. S. Cao, C. Yu, and P.Y. Kam, “Decision-aided joint compensation of transmitter IQ mismatch and phase noise for coherent optical OFDM,” IEEE Photonics Technology Letters, vol. 24, no. 12, pp. 1066-1068, June 2012 (Q1)

182. H. Zhang, P.Y. Kam, and C. Yu, “Performance analysis of coherent optical 8-star QAM systems using decision-aided maximum likelihood phase estimation,” Optics Express, vol. 20, no. 8, pp. 9302-9311, April 2012 (Q1)

183. Z. Wang, W. Zhong, C. Yu, and S. Fu, “Performance improvement of on-off-keying free-space optical transmission systems by a co-propagating reference continuous wave light,” Optics Express, vol. 20, no. 8, pp. 9284-9205, April 2012 (Q1)

184. J. Hu, Z. Chen, and C. Yu, “150-km Long distance FBG temperature and vibration sensor system based on stimulated Raman amplification,” IEEE/OSA Journal of Lightwave Technology, vol. 30, no. 8, pp. 1237-1243, April 2012 (Invited) (Q1)

185. Z. Wang, C. Yu, W. Zhong, J. Chen, and W. Chen, “Performance of a novel LED lamp arrangement to reduce SNR fluctuation for multi-user visible light communication systems,” Optics Express, vol. 20, no. 4, pp. 4564-4573, February 2012 (Q1)

186. X. Shao, P.Y. Kam, and C. Yu, “Maximum likelihood sequence detection in laser phase noise - impaired coherent optical systems,” Optics Express, vol. 19, no. 23, pp. 22600-22606, November 2011 (Q1)

187. J. Yang, C. Yu, Y. Yang, L. Cheng, Z. Li, C. Lu, A.P.T. Lau, H.Y. Tam, and P.K.A. Wai, “PMD-insensitive CD monitoring based on RF clock power ratio measurement with optical notch filter,” IEEE Photonics Technology Letters, vol. 23, no. 21, pp. 1576-1578, November 2011 (Q1)

188. Z. Wang, C. Yu, W. Zhong, and J. Chen, “Performance Improvement by Tilting Receiver Plane in M-QAM OFDM Visible Light Communications,” Optics Express, vol. 19, no. 14, pp. 13418-13427, July 2011 (Q1)

189. S. Zhang, L. Xu, P.Y. Kam, C. Yu, J. Chen, and T. Wang, “A performance investigation of adaptive phase estimations in coherent optical communications,” IEEE Photonics Technology Letters, vol. 23, no. 8, pp. 462 - 464, April 2011 (Q1)

190. B. Dong, J. Hu, C. Liaw, J. Hao, and C. Yu, “Wideband-tunable nanotube Q-switched low threshold erbium doped fiber laser,” Applied Optics, vol. 50, no. 10, pp. 1442-1445, March 2011 (Q2)

191. J. Yang, C. Yu, L. Cheng, Z. Li, C. Lu, A.P.T. Lau, H.Y. Tam, and P.K.A. Wai, “CD-insensitive PMD monitoring based on RF power measurement,” Optics Express, vol. 19, no. 2, pp. 1354-1359, January 2011 (Q1)

192. J. Hu, and C. Yu, “Low power autocorrelation technique based on the degree-of-polarization measurement,” Optics Communications, vol. 283, no. 24, pp. 4928-4932, December 2010 (Q2)

193. T.S.R. Shen, A.P.T. Lau, and C. Yu, “Simultaneous and independent multi-parameter monitoring with fault localization for DSP-based coherent communication systems,” Optics Express, vol. 18, no. 23, pp. 23608-23619, November 2010 (Q1)

194. J. Hu, Z. Chen, X. Yang, J. Ng, and C. Yu, “100-km long distance fiber Bragg grating sensor system based on Erbium-doped fiber and Raman amplification,” IEEE Photonics Technology Letters, vol. 22, no. 19, pp. 1422 - 1424, October 2010 (Q1)

195. S. Zhang, P. Y. Kam, C. Yu, and J. Chen, “Decision-aided carrier phase estimation for coherent optical communications,” IEEE/OSA Journal of Lightwave Technology, vol. 28, no. 11, pp. 1597 – 1607, June 2010 (Q1)

196. Z. Li, C. Yu, Y. Dong, L. Cheng, L.F.K. Lui, C. Lu, A.P.T. Lau, H.Y. Tam, and P.K.A. Wai, “Linear photonic radio frequency phase shifter using a differential-group-delay element and an optical phase modulator,” Optics Letters, vol. 35, no. 11, pp. 1881-1883, May 2010 (Q1)

197. S. Zhang, P. Y. Kam, C. Yu, and J. Chen, “Bit-error rate performance of coherent optical M-ary PSK/QAM using decision-aided maximum likelihood phase estimation,” Optics Express, vol. 18, no. 12, pp. 12088 – 12103, May 2010 (Q1)

198. S. Zhang, L. Xu, J. Yu, M.-F. Huang, P. Y. Kam, C. Yu, and T. Wang, “Dual-stage cascaded frequency offset estimation for digital coherent receivers,” IEEE Photonics Technology Letters, vol. 22, no. 6, pp. 401-403, March 2010 (Q1)

199. S. Zhang, X. Li, P. Y. Kam, C. Yu, and J. Chen, “Pilot-assisted, decision-aided, maximum likelihood phase estimation in coherent optical phase-modulated systems with nonlinear phase noise,” IEEE Photonics Technology Letters, vol. 22, no. 6, pp. 380-382, March 2010 (Q1)

200. J. Yang, J. Hu, C. Yu, Y.K. Yeo, and Y. Wang, “Multi-channel 80-GHz RZ pulse train generation based on parametric process in highly-nonlinear fiber,” Optics Communications, vol. 283, no. 6, pp. 939-945, March 2010 (Q2)

201. Z. Li, Z. Jian, L. Cheng, Y. Yang, C. Lu, A.P.T. Lau, C. Yu, H.Y. Tam, and P.K.A. Wai, “Signed chromatic dispersion monitoring of 100Gbit/s CS-RZ DQPSK signal by evaluating the asymmetry ratio of delay tap sampling,” Optics Express, vol. 18, no. 3, pp. 3149-3157, February 2010 (Q1)

202. Z. Pan, C. Yu, and A.E. Willner, “Optical performance monitoring for the next generation optical communication networks,” Optical Fiber Technology, vol. 16, no. 1, pp. 20-45, January 2010 (Invited) (Q1)

203. S. Zhang, C. Yu, P.Y. Kam, and J. Chen, “Parallel implementation of decision-aided maximum likelihood phase estimation in coherent M-ary phase-shift keying systems,” IEEE Photonics Technology Letters, vol. 21, no. 19, pp. 1471-1473, October 2009 (Q1)

204. S. Zhang, P.Y. Kam, C. Yu, and J. Chen, “Laser linewidth tolerance of decision-aided maximum likelihood phase estimation in coherent optical M-ary PSK and QAM systems,” IEEE Photonics Technology Letters, vol. 21, no. 15, pp. 1075-1077, August 2009 (Q1)

205. C. Yu, Y. Wang, Z. Pan, T. Luo, S. Kumar, B. Zhang, and A.E. Willner, “Carrier-suppressed 160 GHz pulse-train generation using a 40-GHz phase modulator with polarization-maintaining fiber,” Optics Letters, vol. 34, no. 11, pp. 1657-1659, June 2009 (Q1)

206. J. Yang, C. Yu, Z. Chen, J. Ng and X. Yang, “Suppression of polarisation-induced signal fluctuation in optic distributed sensing system based on stimulated Brillouin scattering,” Electronics Letters, vol. 45, no. 3, pp. 154-156, January 2009 (Q2)

207. S. Zhang, P.Y. Kam, J. Chen, and C. Yu, “Decision-aided maximum likelihood detection in coherent optical phase-shift-keying system,” Optics Express, vol. 17, no. 2, pp. 703-715, January 2009 (Q1)

208. G.J. Pendock, X. Yi, C. Yu, and W. Shieh, “Dispersion-monitoring in WDM systems by injecting modulated ASE,” IEEE Photonics Technology Letters, vol. 20, no. 10, pp. 821 - 823, May 2008 (Q1)

209. L. Zhang, T. Luo Y. Yue, C. Yu, and A.E. Willner, “Photosensitivity-enabled dispersion controllability for quasi-phase-matching in photonic crystal fibers,” Optics Letters, vol. 32, no. 24, pp. 3498-3500, December 2007 (Q1)

210. L. Zhang, T. Luo, C. Yu, W. Zhang, and A.E. Willner, “Pattern dependence of data distortion in slow-light elements,” IEEE/OSA Journal of Lightwave Technology, vol. 25, no. 7, pp. 1754-1760, July 2007 (Q1)

211. Z. Pan, S. Chandel, and C. Yu, “Ultrahigh-speed optical pulse generation using a phase modulator and two stages of delayed Mach-Zehnder interferometers,” Optical Engineering, vol. 46, no. 7, Paper 075001, pp. 1-3, July 2007 (Q2)

212. Y. Wang, C. Yu, L.-S. Yan, A.E. Willner, R. Roussev, C. Langrock, M.M. Fejer, Y. Okawachi, J.E. Sharping, and A.L. Gaeta, “44-ns continuously tunable dispersionless optical delay element using a PPLN waveguide with two-pump configuration, DCF, and a dispersion compensator,” IEEE Photonics Technology Letters, vol. 19, no. 11, pp. 861-863, June 2007 (Q1)

213. C. Yu, Z. Pan, T. Luo, Y. Wang, L. Christen, and A.E. Willner, “Beyond 40-GHz return-to-zero optical pulse-train generation using a phase modulator and polarization-maintaining fiber,” IEEE Photonics Technology Letters, vol. 19, no. 1, pp. 42-44, January 2007 (Q1)

214. C. Yu, T. Luo, L. Zhang, and A.E. Willner, “Data pulse distortion induced by a slow light tunable delay line in optical fiber,” Optics Letters, vol. 32, no.1, pp. 20-22, January 2007 (Q1)

215. C. Yu, T. Luo, B. Zhang, Z. Pan, M. Adler, Y. Wang, J.E. McGeehan, and A.E. Willner, “Wavelength-shift-free 3R regenerator for 40-Gb/s RZ system by optical parametric amplification in fiber,” IEEE Photonics Technology Letters, vol. 18, no. 24, pp. 2569-2571, December 2006 (Q1)

216. T. Luo, C. Yu, L.-S. Yan, S. Kumar, Z. Pan, and A.E. Willner, “Simple autocorrelation technique based on degree-of-polarization measurement,” IEEE Photonics Technology Letters, vol. 18, no. 15, pp. 1606 - 1608, August 2006 (Q1)

217. L.-S. Yan, X.S. Yao, C. Yu, Y. Wang, L. Lin, Z. Chen, and A.E. Willner, “High-speed and highly repeatable polarization-state analyzer for 40-Gb/s system performance monitoring,” IEEE Photonics Technology Letters, vol. 18, no. 4, pp. 643 - 645, February 2006 (Q1)

218. T. Luo, C. Yu, Z. Pan, Y. Wang, J.E. McGeehan, M. Adler, and A.E. Willner, “All-optical chromatic dispersion monitoring of a 40-Gb/s RZ signal by measuring the XPM-generated optical tone power in a highly nonlinear fiber,” IEEE Photonics Technology Letters, vol. 18, no. 2, pp. 430 - 432, January 2006 (Q1)

219. L. Zhang, C. Yang, C. Yu, T. Luo, and A.E. Willner, “PCF-based polarization splitters with simplified structures,” IEEE/OSA Journal of Lightwave Technology, vol. 23, no. 11, pp. 3558 - 3565, November 2005 (Q1)

220. T. Luo, C. Yu, Z. Pan, Y. Wang, Y. Arieli, and A.E. Willner, “Dispersive effects monitoring for RZ data by adding a frequency-shifted carrier along the orthogonal polarization state,” IEEE/OSA Journal of Lightwave Technology, vol. 23, no. 10, pp. 3295 - 3301, October 2005 (Q1)

221. Y. Wang, C. Yu, T. Luo, Z. Pan, L.-S. Yan, and A.E. Willner, “Tunable all-optical wavelength conversion and wavelength multicasting using orthogonally polarized fiber FWM,” IEEE/OSA Journal of Lightwave Technology, vol. 23, no.10, pp. 3331 - 3338, October 2005 (Q1)

222. L.-S. Yan, Y. Wang, B. Zhang, C. Yu, J. McGeehan, L. Paraschis, and A.E. Willner, “Reach extension in 10-Gb/s directly modulated transmission systems using asymmetric and narrowband optical filtering,” Optics Express, vol. 13, no. 13, pp. 5106-5115, June 2005 (Q1)

223. L.-S. Yan, C. Yu, Y. Wang, T. Luo, L. Paraschis, and A.E. Willner, “40-Gb/s transmission over 25 km of negative-dispersion fiber using asymmetric narrow-band filtering of a commercial directly modulated DFB laser,” IEEE Photonics Technology Letters, vol. 17, no. 6, pp. 1322-1324, June 2005 (Q1)

224. C. Yu, L. Christen, T. Luo, Y. Wang, Z. Pan, L.-S. Yan, and A.E. Willner, “All-optical XOR gate using polarization rotation in single highly–nonlinear fiber,” IEEE Photonics Technology Letters, vol. 17, no. 6, pp. 1232-1234, June 2005 (Q1)

225. C. Yu, L.-S. Yan, T. Luo, Y. Wang, Z. Pan, and A.E. Willner, “Width-tunable optical RZ pulse train generation based on four-wave mixing in highly-nonlinear fiber,” IEEE Photonics Technology Letters, vol. 17, no. 3, pp. 636-638, March 2005 (Q1)

226. Z. Pan, Y.W. Song, C. Yu, Y. Wang, and A.E. Willner, “Using sampled nonlinearly-chirped fiber Bragg gratings to achieve 40-Gbit/s tunable multi-channel dispersion compensation,” Optics Communications, vol. 241, no. 4-6, pp. 371-375, November 2004 (Q2)

227. C. Yu, Z. Pan, Y. Wang, Y.W. Song, D. Gurkan, M.C. Hauer, D. Starodubov and A.E. Willner, “Polarization-insensitive all-optical wavelength conversion using dispersion-shifted fiber with a fiber Bragg grating and a Faraday rotator mirror,” IEEE Photonics Technology Letters, vol. 16, no. 8, pp. 1906 - 1908, August 2004 (Q1)

228. S.M.R. Motaghian Nezam, Y.W. Song, C. Yu, J. McGeehan, A.B. Sahin, and A.E. Willner, “First-order PMD monitoring for NRZ data using RF clock regeneration techniques,” IEEE/OSA Journal of Lightwave Technology, vol. 22, no. 4, pp. 1086 - 1093, April 2004 (Q1)

229. C. Yu, Q. Yu, Z. Pan, A.B. Sahin, and A.E. Willner, “Optically compensating the PMD-induced RF power fading for single-sideband subcarrier-multiplexed systems,” IEEE Photonics Technology Letters, vol. 16, no. 1, pp. 341 –343, January 2004 (Q1)

230. Z. Pan, Y.W. Song, C. Yu, Y. Wang, Q. Yu, J. Popelek, H. Li, Y. Li, and A.E. Willner, “Tunable chromatic dispersion compensation in 40-Gb/s systems using nonlinearly chirped fiber Bragg gratings,” IEEE/OSA Journal of Lightwave Technology, vol. 20, no. 12, pp. 2239 –2246, December 2002 (Q1)

231. Y.W. Song, Z. Pan, S.M.R. Motaghian Nezam, C. Yu, Y. Wang, D. Starodubov, V. Grubsky, J.E. Rothenberg, J. Popelek, H. Li, Y. Li, R. Caldwell, R. Wilcox, and A.E. Willner, “Tunable dispersion slope compensation for 40-Gb/s WDM systems using broadband nonchannelized third-order chirped fiber Bragg gratings,” IEEE/OSA Journal of Lightwave Technology, vol. 20, no. 12, pp. 2259 –2266, December 2002 (Q1)

232. Z. Pan, Y. Wang, C. Yu, T. Luo, A.B. Sahin, Q. Yu, and A.E. Willner, “Intrabit polarization diversity modulation for the mitigation of PMD effects,” IEEE Photonics Technology Letters, vol. 14, no. 10, pp. 1466 –1468, October 2002 (Q1)

233. M.R. Wang, C. Yu, and A.J. Varela, “Efficient pseudo-nondiffracting beam shaping using a quasicontinuous-phase diffractive element,” Optical Engineering, vol. 40, no. 4, pp. 517-524, April 2001 (Q2)

234. C. Yu, M.R. Wang, A.J. Varela, and B. Chen, “High-density non-diffracting beam array for optical interconnection,” Optics Communications, vol. 177, no. 1-6, pp. 369-376, April 2000 (Q2)

235. X.H. Huang, M.R. Wang, and C. Yu, “High-efficiency flat-top beam shaper fabricated by a nonlithographic technique,” Optical Engineering, vol. 38, no. 2, pp. 208-213, February 1999 (Q2) 

 

 

456. J. Zhou, C. Yu, and H. Kim, “1.5-µm, 21.4-Gb/s 4-PAM VCSEL link for optical access applications,” Conference on Optical Fiber Communication (OFC) 2015, paper Th2A.54, pp. 1-3, Los Angeles, CA, USA, 22-26 March, 2015

457. J. Chen, X. You, H. Zheng, and C. Yu, “MPPM Dimming Control for OFDM-based Visible Light Communication Systems,” 14th IEEE International Conference on Communication Systems (ICCS) 2014, Paper SS10-1, pp. 1-5, Macau, November 19-21, 2014 (Invited)

458. C. Yu, “Carrier recovery for digital coherent transmission,” Asia Communications and Photonics Conference and Exhibition (ACP) 2014, Paper Workshop3.3, pp. 1, Shanghai, China, November 11-14, 2014 (Invited)

459. Y. Fan, J. Chen, P. Cao, and C. Yu, “Performance of carrier phase estimation QPSK optical coherent receiver with N bit resolution ADCs,” 13th International Conference on Optical Communications and Networks (ICOCN) 2014, Paper M32.3, pp. 1-4, Suzhou, China, November 9-10, 2014 (Invited)

460. J. Chen, N. Ma, H. Yang, and C. Yu, “On the performance of MU-MIMO indoor visible light communication system based on THP algorithm,” 3rd IEEE/CIC International Conference on Communications in China (ICCC) 2014, Paper OCSN-2, pp. 1-5, Shanghai, China, October 13-15, 2014 (Invited)

461. J. Chen, X. You, H. Zheng, and C. Yu, “Excess signal transmission with dimming control pattern in indoor visible light communication systems,” Photonics Asia 2014, Paper 9270-40, pp. 1-8, Beijing, China, October 9-11, 2014 (Invited)

462. P. Luo, Z. Ghassemlooy, H. Le Minh, A. Khalighi, X. Zhang, M. Zhang, and C. Yu, “Experimental demonstration of an indoor visible light communication positioning system using dual-tone multi-frequency technique,” 3rd International Workshop on Optical Wireless Communications (IWOW) 2014, pp. 55-59, Funchal, Madeira Island, Portugal, September 17, 2014

463. J. Zhou, C. Yu, and H. Kim, “1.5-µm, 10-Gbps 4-PAM VCSEL transmission for optical access networks,” 12th International Conference on Optical Internet (COIN) 2014, paper FA2-2, pp. 1-3, Jeju, South Korea, August 27-29, 2014

464. C. Yu, Z. Chen, and J. Hu, “Long-range and biomedical measurements based on optical fiber strain sensor,” 35th Progress in Electromagnetic Research Symposium (PIERS) 2014, Paper 4A1-12, pp. 1, Guangzhou, China, August 25-28, 2014 (Invited)

465. J. Chen, Y. Hong, X. You, H. Zheng, and C. Yu, “Conceptual design of multi-user visible light communication systems over indoor lighting infrastructure,” 9th International Symposium on Communication Systems, Networks and Digital Signal Processing (CSNDSP) 2014, Paper 355, pp. 1-4, Manchester, UK, July 23-25, 2014 (Invited)

466. Y. Hong, J. Chen, and C. Yu, “Performance improvement of the pre-coded multi-user MIMO indoor visible light communication system,” 9th International Symposium on Communication Systems, Networks and Digital Signal Processing (CSNDSP) 2014, Paper 62, pp. 1-4, Manchester, UK, July 23-25, 2014

467. Y. Yu and C. Yu, “Pulse carver alignment monitoring for RZ-DPSK and DQPSK signals based on delay-tap sampling technique,” 9th International Symposium on Communication Systems, Networks and Digital Signal Processing (CSNDSP) 2014, Paper 233, pp. 1-4, Manchester, UK, July 23-25, 2014

468. Z. Xu, P.Y. Kam, and C. Yu, “Performance of pilot-assisted maximum likelihood sequence detection for QAM signals,” Signal Processing in Photonics Communications Conference, OSA Advanced Photonics Congress (SPPCom) 2014, Paper SW1C.2, pp. 1-3, San Diego, CA, USA, July 13-17, 2014

469. C. Yu and Y. Yu, “Optical performance monitoring in fiber transmission systems based on electrical sampling technique,” 16th International Conference on Transparent Optical Networks (ICTON) 2014, Paper V.1, pp. 1-4, Graz, Austria, July 6-10, 2014 (Invited)

470. H. Zheng, C. Yu, and H. Kim, “The performance of inter-satellite BFSK and 4FSK optical communication system with pointing error,” OptoElectronics and Communications Conference (OECC) 2014, Paper TU3F-3, pp. 1-3, Melbourne, Australia, July 6-10, 2014

471. Z. Xu, H. Zheng, C. Yu, and P.Y. Kam, “Performance of pilot-assisted maximum-likelihood sequence detection in a rotated-8QAM coherent optical system,” OptoElectronics and Communications Conference (OECC) 2014, Paper TH10E-1, pp. 1-3, Melbourne, Australia, July 6-10, 2014

472. X. Li, Zhuoran Xu, W.D. Zhong, A. Alphones and C. Yu, “Independent component analysis based modified constant modulus algorithm in coherent optical receiver,” OptoElectronics and Communications Conference (OECC) 2014, Paper TH10E-3, pp. 1-3, Melbourne, Australia, July 6-10, 2014

473. X. Li, Z. Xu, W.D. Zhong, A. Alphones, C. Yu, and Z.W. Xu, “Channel equalization based on QR decomposition in direct detection optical DFT-S OFDM,” OptoElectronics and Communications Conference (OECC) 2014, Paper TH10E-3, pp. 1-3, Melbourne, Australia, July 6-10, 2014

474. Y. Fan, J. Chen, and C. Yu, “ADC resolution requirement for DA-ML phase estimation QPSK optical coherent receiver,” OptoElectronics and Communication Conference (OECC) 2014, pp. 442-444, Melbourne, VIC, Australia, July 6-10, 2014

475. C. Yu，P.Y. Kam，and Z. Xu, “Carrier recovery in coherent receiver of optical fiber communication system with laser phase noise,” International Photonics and OptoElectronics Meetings (POEM) 2014, Paper OTh3B.1, pp. 1-3, Wuhan, China, June 18-21, 2014 (Invited)

476. S. Cao, P.Y. Kam, and C. Yu, “Pilot-aided log-likelihood ratio for LDPC coded M-QAM CO-OFDM system,” Conference on Optical Fiber Communication (OFC) 2014, Paper W3J.1, pp. 1-3, San Francisco, CA, USA, March 9-13, 2014

477. Y. Yu and C. Yu, “OSNR monitoring by using single sampling channel generated 2-D phase portrait,” Conference on Optical Fiber Communication (OFC) 2014, Paper Th2A.49, pp. 1-3, San Francisco, CA, USA, March 9-13, 2014

478. X. Li, W.D. Zhong, A. Alphones and C. Yu, “Channel equalization based on independent component analysis for coherent optical PDM-OFDM,” Conference on Optical Fiber Communication (OFC) 2014, Paper Tu3G.2, pp. 1-3, San Francisco, CA, USA, March 9-13, 2014

479. J. Zhou, H. Kim, and C. Yu, “10-Gb/s, 20-km VCSEL optical access link at 1.5 μm with 23-dB power budget,” Conference on Optical Fiber Communication (OFC) 2014, Paper W2A.2, pp. 1-3, San Francisco, CA, USA, March 9-13, 2014

480. J. Chen, Y. Hong, Z. Wang, and C. Yu, “Precoded visible light communications,” 9th International Conference on Information, Communications and Signal Processing (ICICS) 2013, Paper. P0273, pp. 1-4, Tainan, Taiwan, December 10-13, 2013 (Invited)

481. D. Huang, T.-H. Cheng, and C. Yu, “Decision-aided carrier phase estimation with selective averaging for low-cost optical coherent communication,” 9th International Conference on Information, Communications and Signal Processing (ICICS) 2013, Paper. P0214, pp. 1-4, Tainan, Taiwan, December 10-13, 2013

482. J. Chen, Y. Hong, Z. Wang, and C. Yu, “Enhanced signal processing and system configurations for visible light communication,” Asia Communications and Photonics Conference and Exhibition (ACP) 2013, pp. 1-3, Beijing, China, November 12-15, 2013 (Invited)

483. J. Chen, Y. Hong, X. Ma, Z. Wang, and C. Yu, “Advanced technologies in visible light communication systems,” Paper V-2.1, 11th International Conference on Optical Internet (COIN) 2013, pp. 1-3, Beijing, China, October 18-20, 2013 (Invited)

484. X. Ma, J. Chen, X. You, and C. Yu, “Time domain reshuffling of DC-biased optical OFDM signals,” 11th International Conference on Optical Internet (COIN) 2013, Paper. V-3.5, pp. 1-3, Beijing, China, October 18-20, 2013

485. C. Yu, Z. Chen, and J. Hu, “Biomedical optical fiber sensor,” Australian Biomedical Engineering Conference (ABEC) 2013, Paper a54, pp. 1, Sydney, Australia, October 13-16, 2013 (Invited)

486. C. Yu, and Y. Yu, “OSNR monitoring in optical fiber communication systems,” International Conference on Lasers, Optics & Photonics (OPTICS) 2013, pp. 1, San Antonio, TX, USA, October 7-9, 2013 (Invited)

487. J. Chen, X. Ma, and C. Yu, “Time domain reshuffling of asymmetrically clipped optical OFDM signals,” IEEE Photonics Conference (IPC) 2013, pp. 1-2, Bellevue, WA, USA, September 8-12, 2013

488. Y. Yu, C.F. Loh, Z. Xu and C. Yu, “OSNR Monitoring for PDM RZ-DQPSK System by Low Bandwidth Sampling Technique,” Asia-Pacific Conference on Communications (APCC) 2013, Paper V-2.1, pp. 1-2, Bali Dynasty Resort, Bali, Indonesia, August 29-31, 2013

489. Y. Yu and C. Yu, “Simultaneous OSNR and CD Monitoring for NRZ-DPSK and DQPSK Signals by Single-Channel Sampling Technique,” Asia-Pacific Conference on Communications (APCC) 2013, Paper VII-3.1, pp. 1-2, Bali Dynasty Resort, Bali, Indonesia, August 29-31, 2013

490. C. Yu, and Y. Yu, “Optical performance monitoring in high-speed fiber communication systems based on low-bandwidth delay-tap sampling,” 8th International Conference on Communications and Networking in China (ChinaCom) 2013, pp. 1-4, Guilin, China, August 14-16, 2013 (Invited)

491. Z. Chen, J. Hu, and C. Yu, “Fiber sensor for long-range and biomedical measurements,” 12th International Conference on Optical Communications and Networks (ICOCN) 2013, Paper SC2In1, Paper SC2In2, pp. 1-4, Chengdu, China, July 26-28, 2013 (Invited)

492. C. Yu, and Y. Yu, “Optical performance monitoring based on filtering in high-speed optical fiber communication systems,” Signal Processing in Photonics Communications Conference, OSA Advanced Photonics Congress (SPPCom) 2013, Paper SP4D.4, pp. 1-3, Rio Grande, Puerto Rico, USA, July 14-17, 2013 (Invited)

493. X. Li, A. Alphones, W.D. Zhong and C. Yu, “Improved U-S OFDM for fiber nonlinearity mitigation in long haul transmission,” OptoElectronics and Communications Conference (OECC) 2013, Paper TuR4-5, pp. 1-2, Kyoto, Japan, June 30-July 4, 2013

494. Z. Xu, C. Yu, and P.Y. Kam, “Performance of adaptive maximum likelihood sequence detection with nonlinear phase Noise,” OptoElectronics and Communications Conference (OECC) 2013, Paper TuPR-16, pp. 1-2, Kyoto, Japan, June 30-July 4, 2013

495. W. Zhong, Z. Wang, and C. Yu, “Performance enhancement techniques for free-space optical transmission systems,” 15th Anniversary International Conference on Transparent Optical Networks (ICTON) 2013, Paper TuA3.1, pp. 1-4, Cartagena, Spain, June 23-27, 2013 (Invited)

496. Z. Xu, B. Zhang, C. Yu, and P.Y. Kam, “Adaptive maximum likelihood sequence detection in 100-Gb/s coherent optical communication systems,” Conference on Optical Fiber Communication (OFC) 2013, Paper JTh2A.46, pp. 1-3, Anaheim, CA, USA, March 17-21, 2013

497. S. Cao, S. Zhang, C. Yu, and P.Y. Kam, “Full-range pilot-assisted frequency offset estimation for OFDM systems,” Conference on Optical Fiber Communication (OFC) 2013, Paper JW2A.53, pp. 1-3, Anaheim, CA, USA, March 17-21, 2013

498. H. Ju, C. Yu, C.P. Chin, and Y.S. Kwok, “LED-camera communication system with RGB coding,” IEEE Photonics Global Conference (PGC) 2012, Paper 2-3G-4, pp. 1-4, Singapore, December 13-16, 2012

499. Y. Yu, J. Yang, and C. Yu, “Optical signal to noise ratio monitoring using a novel optical notch filtering scheme,” IEEE Photonics Global Conference (PGC) 2012, Paper 2-2G-4, pp. 1-4, Singapore, December 13-16, 2012

500. S. Cao, C. Yu, and P.Y. Kam, “Mitigation of nonlinearity based on optimized percentage of dispersion pre-compensation in coherent optical PDM-OFDM systems,” IEEE Photonics Global Conference (PGC) 2012, Paper 2-1G-3, pp. 1-4, Singapore, December 13-16, 2012 (Best Student Paper Award)

501. C. Yu, J. Yang, and Y. Yu, “Dispersion and OSNR monitoring in high-speed optical fiber communication system,” 11th International Conference on Optical Communications and Networks (ICOCN) 2012, Paper FRI-18, pp. 1-4, Pattaya, Thailand, November 28-30, 2012 (Invited)

502. Z. Wang, J. Chen, W. Zhong, C. Yu, and W. Chen, “User-oriented visible light communication system with dimming control scheme,” 11th International Conference on Optical Communications and Networks (ICOCN) 2012, Paper THU-09, pp. 1-4, Pattaya, Thailand, November 28-30, 2012 (Invited)

503. Y. Yu, J. Yang, and C. Yu, “Low cost and CD insensitive optical signal to noise ratio monitoring method using beat noise,” International Conference on Communications Systems (ICCS) 2012, Paper MC7-2, pp. 1-4, Singapore, November 21-23, 2012

504. C. Yu, P.Y. Kam, and S. Cao, “Decision-aided phase estimation in single carrier and OFDM coherent optical communication systems,” Asia Communications and Photonics Conference and Exhibition (ACP) 2012, Paper AS4C.1, pp. 1-4, Guangzhou, China, November 7-10, 2012 (Invited)

505. C. Yu, “Optical performance monitoring in high-speed reconfigurable optical fiber communication networks,” 7th International Conference on Communications and Networking in China (ChinaCom) 2012, Paper OCN04-1, pp. 1-4, Dianchi Garden Hotel, Kunming, China, August 8-10, 2012 (Invited)

506. S. Cao, P.Y. Kam, and C. Yu, “Log-likelihood Metric for LDPC coded BDPSK-OFDM Transmission,” OptoElectronics and Communications Conference (OECC) 2012, Paper 4B3-4, pp. 1-2, BEXCO, Busan, Korea, July 2-6, 2012

507. S. Cao, P.Y. Kam, and C. Yu, “Pre-distortion versus Post-equalization for IQ Mismatch Compensation in CO-OFDM,” OptoElectronics and Communications Conference (OECC) 2012, Paper 4B3-2, pp. 1-2, BEXCO, Busan, Korea, July 2-6, 2012

508. Z. Wang, W. Zhong, C. Yu, J. Chen, and W. Chen, “Performance of variable M-QAM OFDM visible light communication system with dimming control,” OptoElectronics and Communications Conference (OECC) 2012, Paper 6B1-3, pp. 1-2, BEXCO, Busan, Korea, July 2-6, 2012

509. C. Yu, P.Y. Kam, S. Zhang and J. Chen, “Decision-aided carrier phase estimation for coherent optical communication systems,” Signal Processing in Photonics Communications Conference, OSA Advanced Photonics Congress (SPPCom) 2012, Paper SpTh1B.1, pp. 1-2, Cheyenne Mountain Resort, Colorado Springs, CO, USA, June 19-21, 2012 (Invited)

510. C. Yu, “Dispersion monitoring in high-speed optical communication systems,” 21st Wireless and Optical Communications Conference (WOCC) 2012, pp. 16-19, Kaohsiung, Taiwan, April 19-21, 2012 (Invited)

511. C. Yu, P.Y. Kam, S. Zhang and J. Chen, “Phase estimation in coherent optical fiber communication systems with advanced modulation formats,” Conference on Optical Fiber Communication (OFC) 2012, Paper OTu2G.7, pp. 1-3, Los Angeles, CA, USA, March 4-8, 2012 (Invited)

512. Z. Wang, C. Yu, W. Zhong, and J. Chen, “A novel LED arrangement to reduce SNR fluctuation for multi-user in visible light communication systems,” International Conference on Information, Communications and Signal Processing (ICICS) 2011, Paper TM6, pp. 1-4, Singapore, December 13-16, 2011

513. Z. Wang, W. Zhong, and C. Yu, “Dynamic decision threshold and adaptive coherent detection in FSO communication system,” International Conference on Information, Communications and Signal Processing (ICICS) 2011, Paper WA6, pp. 1-5, Singapore, December 13-16, 2011

514. C. Yu, J. Yang, J. Hu, and B. Zhang, “Chromatic dispersion monitoring based on RF spectrum analysis and delay-tap sampling,” 10th International Conference on Optical Communications and Networks (ICOCN) 2011, Paper WE1, pp. 1-2, Guangzhou, China, December 5-7, 2011 (Invited)

515. J. Chen, C. Yu, Z. Wang, J. Shen, and Y. Li, “Indoor optical wireless integrated with white LED lighting: perspective & challenge,” 10th International Conference on Optical Communications and Networks (ICOCN) 2011, Paper MO6, pp. 1-2, Guangzhou, China, December 5-7, 2011 (Invited)

516. C. Yu, J. Yang, J. Hu, and B. Zhang, “Optical performance monitoring in high-speed optical fiber communication systems,” International Photonics and OptoElectronics Meetings (POEM) 2011, Paper OCSN-2, pp. 1-10, Wuhan, China, November 2-5, 2011 (Invited)

517. J. Hu, Z. Chen, and C. Yu, “150-km long distance fiber sensor system based on Raman amplification,” IEEE Sensors Conference 2011, Paper 1319, pp. 113-116, Limerick, Ireland, October 28-31, 2011

518. W. Chen, C. Yu, Y.S. Kwok and F. Chin, “Video transmission system based on visible light communication,” International Conference on Information Photonics & Optical Communications (IPOC) 2011, Paper 1-3C-3, pp. 1-3, Singapore, October 21-23, 2011

519. X. Shao, C. Yu, and P.Y. Kam, “Joint carrier phase estimation and maximum likelihood sequence detection (J-CPE-MLSD) in coherent optical systems with laser phase noise,” International Conference on Information Photonics & Optical Communications (IPOC) 2011, Paper 2-2C-2, pp. 1-3, Singapore, October 21-23, 2011

520. S. Cao, C. Yu, and P.Y. Kam, “Decision-aided joint compensation of channel distortion and transmitter IQ imbalance for coherent optical OFDM,” IEEE Topical Meeting on Microwave Photonics (MWP) 2011, pp. 312-315, Singapore, October 18-21, 2011

521. C. Yu, P.Y. Kam, S. Zhang and J. Chen, “Phase and frequency offset estimation in coherent optical fiber communication systems,” OptoElectronics and Communications Conference (OECC) 2011, Paper 7B2_1, pp. 1-2, Kaohsiung, Taiwan, July 4-8, 2011 (Invited)

522. S. Cao, C. Yu, and P.Y. Kam, “Decision-aided carrier phase estimation for coherent optical OFDM,” OptoElectronics and Communications Conference (OECC) 2011, Paper 7B2_3, pp. 1-2, Kaohsiung, Taiwan, July 4-8, 2011

523. Z. Xu, S. Zhang, P.Y. Kam, and C. Yu, “On the performance of decision-aided maximum likelihood and its adaptive phase estimation with nonlinear phase noise,” OptoElectronics and Communications Conference (OECC) 2011, Paper 6B3_3, pp. 1-2, Kaohsiung, Taiwan, July 4-8, 2011

524. H. Zhang, C. Yu, and P.Y. Kam, “Optimal ring ratio of 16-Star quadrature amplitude modulation in coherent optical communication systems,” OptoElectronics and Communications Conference (OECC) 2011, Paper 7P3_030, pp. 1-2, Kaohsiung, Taiwan, July 4-8, 2011

525. C. Yu, P.Y. Kam, S. Zhang and J. Chen, “Carrier recovery based on digital signal processing in coherent optical fiber communication systems,” International Symposium on Photonics & Optical Communications (SPOC) 2011, Paper 6.3, pp. 1, Chengdu, China, July 1-3, 2011 (Invited)

526. J. Hu, J. Yang, F. Xu, and C. Yu, “Chromatic dispersion monitoring of RZ-DQPSK signal with low bandwidth detector by evaluating the amplitude ratio of delay tap sampling,” 3rd International High Speed Intelligent Communication Forum (HSIC) 2011, Paper 14, pp. 1, Hong Kong, May 30-31, 2011

527. J. Hu, Z. Chen, J.T. Teo, and C. Yu, “100-km long distance FBG vibration sensor based on matching filter demodulation,” 21st International Conference on Optical Fibre Sensors (OFS) 2011, Proceedings of SPIE, vol. 7753, 77538N, pp. 1-4, Ottawa, Canada, May 15-19, 2011

528. H. Zhang, P. Y. Kam, and C. Yu, “Laser linewidth tolerance of coherent optical 64QAM and 16PSK systems using decision-aided maximum likelihood phase estimation,” Conference on Lasers and Electro-Optics (CLEO) 2011, Paper JWA17, pp. 1-2, Baltimore, MD, USA, May 1-6, 2011

529. S. Zhang, L. Xu, P. Y. Kam, C. Yu, and T. Wang, “Study on the performance of decision-aided maximum likelihood phase estimation with a forgetting factor,” Conference on Optical Fiber Communication (OFC) 2011, Paper JWA022, pp. 1-3, Los Angeles, CA, USA, March 6-10, 2011

530. J. Yang, C. Yu, and Z. Li, “PMD insensitive CD monitoring based on RF power ratio measurement utilizing FBG filter,” IEEE Photonics Global Conference (PGC) 2010, Paper 2-2F-5, pp. 1-5, Singapore, December 14-16, 2010

531. Z. Wang, W. Zhong, S. Zhang, C. Yu, and Y. Ding, “Performance evaluation of OOK free-space optical transmission system with dynamic decision threshold and coherent detection,” IEEE Photonics Global Conference (PGC) 2010, Paper 3-1F-4, pp. 1-5, Singapore, December 14-16, 2010

532. C. Yu and J. Yang, “CD and PMD monitoring based on RF spectrum analysis with optical filtering,” Asia Communications and Photonics Conference and Exhibition (ACP) 2010, Paper FN1, pp. 1-8, Shanghai, China, December 8-12, 2010 (Invited)

533. J. Yang, M. He, H. Lu, Z. Li, and C. Yu, “Chromatic dispersion monitoring of DQPSK and D8PSK signals based on delay-tap sampling technique,” International Conference on Communications Systems (ICCS) 2010, paper PM1-2-1-4, pp. 1-5, Singapore, November 17-19, 2010

534. Z. Li, L. Cheng, C. Lu, and C. Yu, “A novel dispersion monitoring scheme by evaluating eye diagram for 100Gbit/s CS-RZ DQPSK systems,” International Conference on Communications Systems (ICCS) 2010, paper PM1-2-1-2, pp. 1-5, Singapore, November 17-19, 2010

535. C. Yu, P.Y. Kam, S. Zhang, and J. Chen, “Phase estimation in coherent communication systems with semiconductor laser noises,” Photonics Asia 2010, Paper 7844-19, pp. 1-10, Beijing, China, October 18-20, 2010 (Invited)

536. H. Lu, S. Zhang, C. Yu, and P.Y. Kam, “Impact of amplifier beat and nonlinear phase noises on coherent optical communication system,” 9th International Conference on Optical Communications and Networks (ICOCN) 2010, pp. 294-298, Nanjing, China, October 24-27, 2010

537. S. Zhang, C. Yu, P.Y. Kam, and J. Chen, “Performance comparison between decision-aided maximum likelihood and adaptive decision-aided phase estimation,” 9th International Conference on Optical Communications and Networks (ICOCN) 2010, pp. 253-257, Nanjing, China, October 24-27, 2010

538. S. Zhang, L. Xu, P. Y. Kam, C. Yu, and T. Wang, “Performance investigation of the joint SPM compensation in a long-haul coherent dual-polarization QPSK system,” Europe Conference on Optical Communication (ECOC) 2010, Paper P3.15, pp. 1-3, Torino, Italy, September 19-23, 2010

539. C. Yu, J. Yang and J. Hu, “Nonlinear fiber based processing for high speed optical communication and sensor systems,” IEEE Photonics Society Summer Topical Meetings (SUM) 2010, Paper TuC2-3, pp. 1-2, Playa del Carmen, Riviera Maya, Mexico, July 19-21, 2010 (Invited)

540. J. Yang, C. Yu, L. Cheng, Z. Li, and C. Lu, “PMD insensitive CD monitoring based on RF power ratio in D8PSK and DQPSK systems,” 9th International Conference on Optical Internet (COIN) 2010, Paper TuC3-3, pp. 1-4, Jeju, Korea, July 11-14, 2010

541. C. Yu, P.Y. Kam, S. Zhang and J. Chen, “Decision-aided maximum likelihood phase estimation in coherent communication systems,” OptoElectronics and Communications Conference (OECC) 2010, Paper 9B3-1, pp. 1-2, Sapporo, Japan, July 5-9, 2010 (Invited)

542. Z. Li, C. Yu, L. Cheng, L.F.K. Lui, C. Lu, A.P.T. Lau, H.Y. Tam, and P.K.A. Wai, “Stable photonic RF phase shifter based on a polarization sensitive optical phase modulator,” OptoElectronics and Communications Conference (OECC) 2010, Paper 6D2-6, pp. 1-2, Sapporo, Japan, July 5-9, 2010

543. S. Zhang, C. Yu, P.Y. Kam, and J. Chen, “Optimizing the performance of normalized least-mean square phase estimation for digital coherent receivers,” OptoElectronics and Communications Conference (OECC) 2010, Paper 7P-16, pp. 1-2, Sapporo, Japan, July 5-9, 2010

544. H. Zhang, S. Zhang, P.Y. Kam, C. Yu, and J. Chen, “Optimized phase error tolerance of 16-star quadrature amplitude modulation in coherent optical communication systems,” OptoElectronics and Communications Conference (OECC) 2010, Paper 8P-15, pp. 1-2, Sapporo, Japan, July 5-9, 2010

545. Y. Yu, H. Zhang, and C. Yu, “107-Gb/s WDM DQPSK Systems with 50 GHz Channel Spacing by Low-Crosstalk Demodulators,” OptoElectronics and Communications Conference (OECC) 2010, Paper 7P-23, pp. 1-2, Sapporo, Japan, July 5-9, 2010

546. S. Shen, A.P.T. Lau, and C. Yu, “Joint nonlinear parameters and OSNR monitoring for DSP-based coherent systems,” OptoElectronics and Communications Conference (OECC) 2010, Paper 7P-20, pp. 1-2, Sapporo, Japan, July 5-9, 2010

547. J. Hu, Z. Chen, X. Yang, J. Ng, and C. Yu, “100-km long distance FBG vibration sensor,” 2nd Asia-Pacific Optical Sensors Conference (APOS) 2010, Paper P0093, pp. 1-2, Guangzhou, China, June 28-30, 2010

548. C. Yu, “High speed optical pulse train generation and measurement in optical fiber communication systems,” International High Speed Intelligent Communication Forum (HSIC) 2010, Paper TR74.6, pp. 1-2, Singapore, May 13-14, 2010 (Invited)

549. J. Yang, and C. Yu, “Broadband multi-wavelength light source generation using a single phase modulator in a loop,” Conference on Lasers and Electro-Optics (CLEO) 2010, Paper JThE56, pp. 1-2, San Jose, CA, USA, May 16-21, 2010

550. J. Yang, C. Yu, L. Cheng, Z. Li, C. Lu, A.P.T. Lau, H.Y. Tam, and P.K.A. Wai, “CD insensitive PMD monitoring by using FBG notch filter in 57-Gbit/s D8PSK and 38-Gbit/s DQPSK systems,” Conference on Lasers and Electro-Optics (CLEO) 2010, Paper CThDD4, pp. 1-2, San Jose, CA, USA, May 16-21, 2010

551. S. Zhang, P. Y. Kam, C. Yu, and J. Chen, “Frequency offset estimation using a Kalman filter in coherent optical phase-shift keying systems,” Conference on Lasers and Electro-Optics (CLEO) 2010, Paper CFC1, pp. 1-2, San Jose, CA, USA, May 16-21, 2010

552. S. Zhang, L. Xu, J. Yu, M.-F. Huang, P. Y. Kam, C. Yu, and T. Wang, “Novel ultra wide-range frequency offset estimation for digital coherent optical receiver,” Conference on Optical Fiber Communication (OFC) 2010 , Paper OMK1, pp. 1-3, San Diego, CA, USA, March 21-25, 2010

553. S. Zhang, L. Xu, J. Yu, P. Y. Kam, C. Yu, and T. Wang, “Experimental demonstration of decision-aided maximum likelihood phase estimation in 8-channel 42.8-Gbit/s DWDM coherent PolMux-QPSK system,” Conference on Optical Fiber Communication (OFC) 2010, Paper OWV3, pp. 1-3, San Diego, CA, USA, March 21-25, 2010

554. J. Yang, K.W.L. Chee, and C. Yu, “CD insensitive PMD monitoring for different modulation formats based on RF tone power measurement using an FBG notch filter,” 7th International Conference on Information, Communications and Signal Processing (ICICS) 2009, Paper P0727, pp. 1-5, Macau, December 8-10, 2009 (Best Student Paper Award)

555. S. Zhang, J. Chen, C. Yu, W. Rong, and P. Y. Kam, “ADC bandwidth optimization in coherent optical polarization multiplexing quadrature phase-shift keying system,” Asia Communications and Photonics Conference and Exhibition (ACP) 2009 , Paper FC3, pp. 1-6, Shanghai, China, November 2-6, 2009

556. J. Hu, Z. Chen, X. Yang, J. Ng, C. Yu, “Long distance fiber Bragg grating sensor system based on Erbium-doped fiber and Raman amplification,” Asia Communications and Photonics Conference and Exhibition (ACP) 2009, Paper TuC5, pp. 1-6, Shanghai, China, November 2-6, 2009 (Best Student Presentation Award Honorable Mention)

557. J. Yang, J. Hu, C. Yu, Y.K. Yeo, and Y. Wang, “Multi-channel 80-GHz pulse train generation based on four-wave mixing in highly nonlinear fiber,” OptoElectronics and Communications Conference (OECC) 2009, Paper TuA5, pp. 1-2, Hong Kong, July 13-17, 2009 (Certificate of Merits)

558. J. Hu, C. Yu, “An improved autocorrelation technique based on the degree-of-polarization measurement,” OptoElectronics and Communications Conference (OECC) 2009, Paper ThM4, pp. 1-2, Hong Kong, July 13-17, 2009

559. J. Yang, J. Hu, C. Yu, Y.K. Yeo, and Y. Wang, “80-GHz multi-channel RZ pulse train generation based on XPM and FWM in a nonlinear optical loop mirror,” 5th International Conference on Materials for Advanced Technologies (ICMAT) 2009, Paper P-S5.03, pp. 1-3, Singapore, June 28-July 3, 2009

560. J. Yang, C. Yu, Z. Chen, J. Ng, and X. Yang, “Polarization insensitivity optic distributed strain sensing system based on stimulated Brillouin scattering,” 5th International Conference on Materials for Advanced Technologies (ICMAT) 2009, P-S10.12, pp. 1-3, Singapore, June 28-July 3, 2009 (Best Paper Award)

561. X. Li, S. Zhang, C. Yu, and P. Y. Kam, “Pilot decision-aided maximum likelihood phase estimation in coherent optical QPSK and 8PSK systems with nonlinear phase noise,” Conference on Lasers and Electro-Optics (CLEO) 2009, Paper CMZ4, pp. 1-2, Baltimore, MD, USA, May 31-June 5, 2009

562. S. Zhang, P. Y. Kam, and C. Yu, “Block length effect of decision-aided maximum likelihood phase estimation in coherent optical communication systems,” Conference on Lasers and Electro-Optics (CLEO) 2009, Paper CMZ3, pp. 1-2, Baltimore, MD, USA, May 31-June 5, 2009

563. S. Zhang, P.Y. Kam, J. Chen, and C. Yu, “A comparison of phase estimation in coherent optical PSK system,” IEEE Photonics Global Conference (PGC) 2008, Paper C3-4A-03, Singapore, December 8-11, 2008

564. G.J. Pendock, W. Shieh, X. Yi, and C. Yu, “Measuring dispersion in WDM links with modulated background ASE,” OptoElectronics and Communications Conference (OECC) 2008, Paper WeK-2, pp. 1-2, Sydney, Australia, July 7-10, 2008

565. S. Zhang, P.Y. Kam, J. Chen, and C. Yu, “Adaptive decision-aided maximum likelihood phase estimation in coherent optical DQPSK system,” OptoElectronics and Communications Conference (OECC) 2008, Paper TuA-4, pp. 1-2, Sydney, Australia, July 7-10, 2008

566. S. Zhang, P.Y. Kam, J. Chen, and C. Yu, “Receiver sensitivity improvement using decision-aided maximum likelihood phase estimation in coherent optical DQPSK system with nonlinear phase noise,” Conference on Lasers and Electro-Optics (CLEO) 2008, Paper CthJJ2, pp. 1-2, San Jose, CA, USA, May 4-9, 2008

567. C. Yu, “Optical short pulse generation and measurement based on fiber polarization effects,” 17th Wireless and Optical Communications Conference (WOCC) 2008, Paper Optical-11, pp. 66, Taichung, Taiwan, April 23-24, 2008 (Invited)

568. J. Yang, C. Yu, Z. Chen, J. Ng, and X. Yang, “Suppression of polarization sensitivity in BOTDA fiber distributed sensing system,” 19th International Conference on Optical Fibre Sensors (OFS) 2008, Proceedings of SPIE, vol. 7004, Paper 700421, pp. 1-4, Perth, Australia, April 14-18, 2008

569. C. Yu, G.J. Pendock, X. Yi, and W. Shieh, “Dispersion measurement through WDM systems with modulated background ASE,” Conference on Optical Fiber Communication (OFC) 2008, Paper JWA29, pp. 1-3, San Diego, CA, USA, February 24-28, 2008

570. C. Yu, J. Yang, Z. Li, and Y. Wang, “Multi-channel 160-GHz pulse generator using a 40-GHz phase modulator and two stages of PM fiber,” 6th International Conference on Information, Communications and Signal Processing (ICICS) 2007, Paper P0848, pp. 1-4, Singapore, December 10-13, 2007

571. C. Yu, Z. Li, J. Yang and Y. Wang, “Multi-channel high-speed optical pulse train generation based on phase modulation at half frequency,” Conference on Lasers and Electro-Optics (CLEO) 2007, Paper CMJJ7, pp. 1-2, Baltimore, MD, USA, May 6-11, 2007

572. Z. Li, Y.J. Wen, C. Yu, W. Rong, Y. Wang, and T.H. Cheng, “Optimizing Raman/EDFA hybrid amplifier based on dual-order stimulated Raman scattering of a single pump,” Conference on Lasers and Electro-Optics (CLEO) 2007, Paper JTuA63, pp. 1-2, Baltimore, MD, USA, May 6-11, 2007

573. Y. Dong, Z. Li, C. Yu, Y.J. Wen, Y. Wang, C. Lu, W. Hu and T.H. Cheng, “Generation of multi-channel short-pulse sources using nonlinear optical loop mirror based on photonic crystal fiber,” Conference on Optical Fiber Communication (OFC) 2007, Paper JWA9, pp. 1-3, Anaheim, CA, USA, March 25-29, 2007

574. C. Yu, “Applications of fiber nonlinearities in high-speed WDM optical communication systems,” 15th Wireless and Optical Communications Conference (WOCC) 2006, Paper PS-4-2, pp. 1, Hangzhou, China, October 12-13, 2006 (Invited)

575. Z. Zhu, A.M.C. Dawes, D. Gauthier, M.D. Stenner, M.A. Neifeld, T. Luo, C. Yu, L. Zhang, and A.E. Willner, “Recent advances in stimulated Brillouin scattering slow light,” OSA Topical Meeting on Slow and Fast Light, Paper TuB1, pp. 1, Washington D.C., USA, July 23-26, 2006 (Invited)

576. Z. Pan, S. Chandel, and C. Yu, “160 GHz optical pulse generation using a 40 GHz phase modulator and two stages of delayed MZ interferometers,” Conference on Lasers and Electro-Optics (CLEO) 2006, Paper CFP2, pp. 1-2, Long Beach, CA, USA, May 21-26, 2006

577. C. Yu, L. Xu, and T. Wang, “>Six-times the transmission distance over standard single-mode fiber for 10-Gb/s directly-modulated system by off-center filtering and electronic equalization,” Conference on Lasers and Electro-Optics (CLEO) 2006, Paper CMNN4, pp. 1-2, Long Beach, CA, USA, May 21-26, 2006

578. T. Luo, L. Zhang, W. Zhang, C. Yu, S. Hu, and A.E. Willner, “Reduction of pattern dependent distortion on data in an SBS-based slow light fiber element by detuning the channel away from the gain peak,” Conference on Lasers and Electro-Optics (CLEO) 2006, Paper CThCC4, pp. 1-2, Long Beach, CA, USA, May 21-26, 2006

579. C. Yu, L. Xu, E. Ip, P.N. Ji, T. Wang, S. Murakami, Y. Yano, and T. Tajima, “Comparison of modulation formats for 40-Gbit/s DWDM optical fiber transmission systems with 50-GHz channel spacing,” IEEE Sarnoff Symposium 2006, Paper S4.5, pp. 1-4, Princeton, NJ, USA, March 27-28, 2006

580. L. Zhang, T. Luo, W. Zhang, C. Yu, Y. Wang, and A.E. Willner, “Optimizing operating conditions to reduce data pattern dependence induced by slow light elements,” Conference on Optical Fiber Communication (OFC) 2006, Paper OFP7, pp. 1-3, Anaheim, CA, USA, March 5-10, 2006

581. A.E. Willner, L. Zhang, T. Luo, C. Yu, W. Zhang, and Y. Wang, “Data bit distortion induced by slow light in optical communication systems,” SPIE Photonics West ‘06, Proceedings of SPIE, vol. 6130, pp. 175-182, San Jose, CA, USA, January 21-26, 2006 (Invited)

582. C. Yu, T. Luo, L. Zhang, and A.E. Willner, “Distortion effects on data pulses in a slow light tunable delay line due to stimulated Brillouin scattering in a highly nonlinear fiber,” Europe Conference on Optical Communication (ECOC) 2005, Paper Mo4.5.2, pp. 1-2, Glasgow, Scotland, September 25-29, 2005

583. T. Luo, C. Yu, L.-S. Yan, S. Kumar, Z. Pan, A.E. Willner, and S. Yao, “Simple autocorrelation technique by tuning a DGD element and measuring a pulse's degree-of-polarization,” Europe Conference on Optical Communication (ECOC) 2005, Paper We2.3.3, pp. 1-2, Glasgow, Scotland, September 2005

584. Y. Wang, C. Yu, L.-S. Yan, A.E. Willner, R. Roussev, C. Langrock, and M.M. Fejer, “Continuously-tunable dispersionless 44-ns all optical delay element using a two-pump PPLN, DCF, and a dispersion compensator,” Europe Conference on Optical Communication (ECOC) 2005, Paper Th1.3.3, pp. 1-2, Glasgow, Scotland, September 25-29, 2005

585. L.-S. Yan, X Yao, L. Lin, Z. Chen, C. Yu, Y. Wang, and A.E. Willner, “<1-ms highly-repeatable polarization-state generator and analyzer for 40-Gb/s system performance monitoring,” Europe Conference on Optical Communication (ECOC) 2005, Paper Th3.2.3, pp. 1-2, Glasgow, Scotland, September 25-29, 2005

586. L. Zhang, T. Luo, L. Yan, Y. Wang, C. Yu, and A.E. Willner, “Periodic dispersion compensation induced by photo-sensitivity for achieving quasi-phase matching in holey fibers,” Conference on Lasers and Electro-Optics (CLEO) 2005, Paper JWB49, pp. 1-2, Baltimore, MD, USA, May 22-27, 2005

587. C. Yu, T. Luo, B. Zhang, Z. Pan, M. Adler, Y. Wang, J.E. McGeehan, and A.E. Willner, “3R regeneration of a 40-Gbit/s optical signal by optical parametric amplification in a highly-nonlinear fiber,” Conference on Optical Fiber Communication (OFC) 2005 , Paper OTuO1, pp. 1-3, Anaheim, CA, USA, March 6-11, 2005

588. C. Yu, Z. Pan, T. Luo, S. Kumar, L.-S. Yan, B. Zhang, L. Zhang, Y. Wang, M. Adler, and A.E. Willner, “160-GHz pulse generator using a 40-GHz phase modulator and PM fiber,” Conference on Optical Fiber Communication (OFC) 2005 , Paper OThR5, pp. 1-3, Anaheim, CA, USA, March 6-11, 2005

589. T. Luo, Z. Pan, C. Yu, L.-S. Yan, S. Kumar, B. Zhang, M. Adler, A.E. Willner, and S. Yao, “Optical-fiber-based autocorrelation technique using a tunable DGD element and highly-nonlinear fiber,” Conference on Optical Fiber Communication (OFC) 2005, Paper OFH6, pp. 1-3, Anaheim, CA, USA, March 6-11, 2005

590. L.-S. Yan, T. Lu, B. Zhang, C. Yu, D. Yevick, and A.E. Willner, “Fiber transmission system application and limitation of multicanonical sampling in PMD emulation,” Conference on Optical Fiber Communication (OFC) 2005, Paper OThT4, pp. 1-3, Anaheim, CA, USA, March 6-11, 2005

591. Z. Pan, A.E. Willner, C. Yu, and Y. Wang, “Applications of highly nonlinear fiber in WDM communications systems,” OSA/SPIE Optics in the Southeast 2004, Paper D2, pp. 1, Charlotte, NC, USA, November 4-5, 2004 (Invited)

592. C. Yu, Z. Pan, T. Luo, Y. Wang, L. Christen, and A.E. Willner, “40-GHz RZ and CS-RZ pulse generation using a phase modulator and PM fiber,” Europe Conference on Optical Communication (ECOC) 2004, Paper We.4.P.125, pp. 1-2, Stockholm, Sweden, September 5-9, 2004

593. L.-S. Yan, Y. Wang, B. Zhang, C. Yu, J. McGeehan, L. Paraschis, and A.E. Willner, “1,400 km transmission using a directly modulated DFB Laser and optical sideband filtering in an 8x10 Gb/s WDM system,” Europe Conference on Optical Communication (ECOC) 2004, Paper Mo4.5.7, pp. 1-2, Stockholm, Sweden, September 5-9, 2004

594. C. Yu, L.-S. Yan, T. Luo, Y. Wang, Z. Pan, and A.E. Willner, “Width-tunable optical pulse generation based on four-wave mixing in highly-nonlinear fiber,” Conference on Lasers and Electro-Optics (CLEO) 2004, Paper CTuN4, pp. 1-2, San Francisco, CA, USA, May 16-21, 2004

595. C. Yu, L. Christen, T. Luo, Y. Wang, Z. Pan, L.-S. Yan, and A.E. Willner, “All-optical XOR gate based on Kerr effect in single highly-nonlinear fiber,” Conference on Lasers and Electro-Optics (CLEO) 2004, Paper CFA4, pp. 1-2, San Francisco, CA, USA, May 16-21, 2004

596. Y. Wang, C. Yu, T. Luo, Z. Pan, L.-S. Yan, and A.E. Willner, “Tunable all-optical wavelength conversion and wavelength multicasting using orthogonally-polarized fiber FWM,” Conference on Lasers and Electro-Optics (CLEO) 2004, Paper CFA6, pp. 1-2, San Francisco, CA, USA, May 16-21, 2004

597. L.-S. Yan, Y. Wang, B. Zhang, C. Yu, J. McGeehan, L. Paraschis, and A.E. Willner, “Reach extension in 10-Gb/s directly modulated systems using narrow-band partial optical filtering,” Conference on Lasers and Electro-Optics (CLEO) 2004, Paper CWA18, pp. 1-2, San Francisco, CA, USA, May 16-21, 2004

598. T. Luo, C. Yu, L.-S. Yan, Z. Pan, Y. Wang, Y.W. Song, and A.E. Willner, “Polarization-insensitive single-pump optical parametric amplifier by depolarization of the pump,” Conference on Optical Fiber Communication (OFC) 2004, Paper TuC1, pp. 1-3, Los Angeles, CA, USA, February 22-27, 2004

599. T. Luo, C. Yu, Z. Pan, Y. Wang, Y. Arieli, and A.E. Willner, “Chromatic-dispersion-insensitive DGD monitoring by adding a frequency-shifted carrier along the orthogonal polarization state,” IEEE LEOS Annual Meeting2003, Paper TuA4, pp. 1-2, Tucson, AZ, USA, October 26-30, 2003

600. C. Yu, Y. Wang, T. Luo, Z. Pan, S.M.R. Motaghian Nezam, A.B. Sahin, and A.E. Willner, “Chromatic-dispersion-insensitive PMD monitoring for NRZ data based on clock power measurement using a narrowband FBG notch filter,” Europe Conference on Optical Communication (ECOC) 2003, Paper Tu4.2.3, pp. 1-2, Rimini, Italy, September 21-25, 2003

601. Y. Wang, Z. Pan, C. Yu, T. Luo, A. Sahin, and A.E. Willner, “A multi-wavelength optical source based on supercontinuum generation using phase and intensity modulation at the line-spacing rate,” Europe Conference on Optical Communication (ECOC) 2003, Paper Th3.2.4, pp. 1-2, Rimini, Italy, September 21-25, 2003

602. C. Yu, Z. Pan, Y. Wang, Y.W. Song, D. Gurkan, M.C. Hauer, D. Starodubov, and A.E. Willner, “Polarization-insensitive four-wave mixing wavelength conversion using a fiber Bragg grating and a Faraday rotator mirror,” Conference on Optical Fiber Communication (OFC) 2003, Paper WG2, pp. 1-3, Atlanta, GA, USA, March 23-28, 2003

603. Y. Wang, Z. Pan, A.B. Sahin, L.-S. Yan, C. Yu, and A.E. Willner, “In-line chromatic dispersion monitoring using optically-added phase-modulated in-band tones For 10 Gb/s system,” Conference on Optical Fiber Communication (OFC) 2003, Paper WP3, pp. 1-3, Atlanta, GA, USA, March 23-28, 2003

604. Z. Pan, Y.W. Song, C. Yu, Y. Wang, J. Popelek, H. Li, Y. Li, and A.E. Willner, “Tunable dispersion compensation in a 4´40-Gb/s system using sampled nonlinearly-chirped fiber Bragg gratings (NG-FBGs),” Europe Conference on Optical Communication (ECOC) 2002, Paper 10.3.2, pp. 1-2, Copenhagen, Denmark, September 8-12, 2002

605. Y.W. Song, Z. Pan, C. Yu, Y. Wang, J. Popelek, H. Li, Y. Li, and A.E. Willner, “Error-free tunable dispersion slope compensation for 40-Gb/s WDM Systems using nonchannelized 3rd-order chirped fiber Bragg gratings,” Europe Conference on Optical Communication (ECOC) 2002, Paper 6.2.1, pp. 1-2, Copenhagen, Denmark, September 8-12, 2002

606. C. Yu, Q. Yu, Z. Pan, A.B. Sahin, and A.E. Willner, “Optical compensation of PMD-induced power fading for single sideband subcarrier-multiplexed Systems,” Conference on Optical Fiber Communication (OFC) 2002, Paper WQ5, pp. 1-3, Anaheim, CA, USA, March 17-22, 2002

607. Z. Pan, Y. Wang, C. Yu, T. Luo, A.B. Sahin, Q. Yu, and A.E. Willner, “Intra-bit polarization diversity modulation for PMD mitigation,” Europe Conference on Optical Communication (ECOC) 2001, Paper We.P.37, pp. 1-2, Amsterdam, Netherlands, September 30-October 4, 2001

608. C. Yu, M.R. Wang, and A.J. Varela, “High-efficiency non-diffracting beam shaping using a diffractive element,” OSA Annual Meeting 1999, Paper TuFF6, pp. 1, San Jose, CA, USA, September 26-October 1, 1999

609. C. Yu, M.R. Wang, and A.J. Varela, “High density non-diffracting beam array for optical interconnection,” OSA Annual Meeting 1999, Paper TuQQ4, pp. 1, San Jose, CA, USA, September 26-October 1, 1999

 

循光而行 通达万里

——记香港理工大学教授余长源

 2023-11-28

从中国古籍中记载的小孔成像实验，到西方爱因斯坦重新确立光的波粒二象性，人类对光的追逐与探索从未间断，且随着科学进步蓬勃发展。以至于自1901年以来的114项诺贝尔物理学奖中有47项与光子学有关。如今，光子学研究已经涉及从基础科学到几乎所有的工程应用，光纤通信便是其中一个十分活跃的领域，不仅为现代互联网的诞生发展铺设了信息高速公路，也衍生出了光纤传感等应用。

▲余长源

2022年11月8日，美国光学学会（Optica/OSA）发布了2023年度新当选会士（Fellow）名单，来自全球24个国家和地区的109位学者入选。香港理工大学教授余长源榜上有名。作为长期致力于集成光电器件、光纤传感、光纤通信系统与网络及光电生物医疗仪器研究的学者，他的当选理由，正是为光纤通信和传感系统中的信号处理作出了重大贡献且积极服务于光学界。循光而行，从中国到美国，从新加坡再回到中国，立足香港，无论宽阔大道，还是蜿蜒山路，余长源始终不懈追寻，技术应用因此遍地开花、通达万里。 

恩师指引，踏上追光之路 

余长源是福建人，父母与中小学老师开明，成长环境宽松自由。少年时期，他考入福州一中就读，成绩名列前茅，同时入选数学和物理奥林匹克竞赛福建省集训队，最终凭借优异的表现保送清华大学现代应用物理系，也与几位志同道合的伙伴成为终身挚友。从小余长源心目中最闪光的英雄就是物理学家杨振宁和李政道。求知若渴的他在本科学习期间还选修了企业管理的经济学双学位。他早早认识到科技在社会经济生产中的重要作用，坚定了要走科研路的决心。“很感谢我的本科毕业论文导师朱嘉麟教授，在他的指导下，我了解了关于半导体物理与激光基本理论，完成了关于‘Ⅱ-Ⅵ半导体量子点中的激子’的论文，并对此产生了兴趣。”提起恩师，余长源充满感激。

1997年从清华大学毕业后，余长源赴美留学。在美国迈阿密大学电子与计算机工程系，他跟随麦克·R.王（Michael R. Wang）教授研究光电器件，开始与“光”有了更为深入的接触。1999年硕士毕业后，他进入南加州大学电子工程系读博，师从国际光纤通信领域的著名专家，美国工程院院士、光学学会主席艾伦·E.维尔纳（Alan E.Willner）教授，于2005年获得博士学位。由此，他完成了从半导体与激光基础理论到光电器件再到光纤通信系统一段完整的光电信息科技的学习经历，“光”成为他接下来生命里一直追逐的目标。

在世界光纤通信史上，1966年是一个重要年份。彼时的华人科学家、后来的诺贝尔奖得主高锟博士在这年发表了一篇划时代性的论文，他在文章中提出低损耗的石英玻璃光学纤维可望作为通信媒质，从此开创了光纤通信研究领域。此后半个多世纪，如何让光更快、更远、更准地传递信息的问题，引得无数科研人员呕心沥血，投身于光纤通信技术跃迁的浩荡发展史。随着掺铒光纤放大器（EDFA）和波分复用系统（WDM）的普及，光纤通信容量每10年增长100倍，以光纤通信为主干网的互联网让信息的传播无远弗届，彻底改变世界。余长源攻读博士期间，正值光纤通信由单波长10Gb/s向40Gb/s及更大容量发展的关键时期。“维尔纳教授所带领的研究组是当时美国非常重要也是规模最大的光纤通信研究组之一，我跟随教授及师兄师姐学习了几年，做了一系列有关高速可重构波分复用光纤通信系统中的色散和非线性效应研究。”基于这些科研成果，余长源获得了2004年度国际电气电子工程师协会（IEEE）光电学会优秀博士生奖，成为当年的12名获奖人之一。

▲在美国南加州大学的博士毕业典礼上，余长源（左二）与恩师、父母合影

博士毕业后，余长源短暂地在日本电气公司（NEC）美国研究所任访问研究员，2005年年底，他加入新加坡国立大学电子与计算机工程系任教，担任光电系统研究小组创始负责人及博士生导师。新加坡给予年轻导师充足的经费支持，在这里，余长源也兼任新加坡科技研究局资讯通信研究院高级研究员，并于2007年任澳大利亚墨尔本大学访问教授。10年耕耘，硕果累累，他的团队先后多次获得国际会议最佳论文奖。他也积极开展与中国内地的科研合作，并参与了新加坡国立大学苏州研究院的筹建工作。经新加坡国立大学苏州研究院推荐，在2014年中国创新创业大赛中，他与同事及学生将研发与市场相结合，凭借项目“基于光纤传感的智能健康监测系统与应用”，打败来自五湖四海的上万名竞争对手，获得生物医学领域全国冠军，被人民网、《科技日报》和江苏电视台等官方媒体报道。

2015年，为与移居香港的父母团聚，也被香港背靠内地、地处科研与产业双优的大湾区科创环境所吸引，余长源正式加入香港理工大学电子与资讯工程学系任教授。“有赖政策支持，我不仅可以申请香港的资金，还可以申请国家自然科学基金，科技部、广东省的基金。香港理工大学在深圳也设有研究院，我跟内地同行展开了不少合作研究。从国家层面到地方政府，都给了我坚实的支持。”对于过往，余长源非常感恩——“自进入光纤通信研究领域以来，互联网信息量成倍地增长，对通信技术不断提出更高的要求，这就需要从业者持续学习，迭代自己的技术储备，创新不止。我幸运的地方在于，一路都在世界前沿的研究院所工作，有足够的支持，能够更清晰地感知潮流变化并投身其中。我招收的研究生，所带领的团队成员也很优秀，大家可以齐心协力，快速地向前发展。”

这些年林林总总下来，余长源已经主持/共同主持50多个研究项目，从中国香港、中国内地，新加坡、美国和澳大利亚获得超过1000万美元的资金，并先后指导了20余名博士后研究员和40余名博士生。他撰写/合著了6个书籍章节及600余篇期刊/会议论文（包括100余篇国际学术会议的主题/邀请报告，比如美国光纤通信会议OFC）。此外，他还曾服务于100余个国际会议的组委会或技术委员会，以及新加坡政府电信标准咨询委员会，为光学界持续贡献了创新力量。 

共谋发展，弄潮光纤通信 

从几何光学角度来说，由于全内反射的效应，光可以在光纤内往返曲折地向前传输成千上万公里。因其带宽非常宽，可携带大量信息，在互联网高速发展的今天，全球光纤正以超音速（每小时约1600公里）的速度部署。如此大量的信息传输，要求极低的误码率，如何运用数学和物理方法，将干扰因素降低，将性能提升，是光纤通信研究要处理的问题。

“一段时间里，光的调制主要以强度调制为主。困难在于，如果光探测器只能测光的强度，其相位信息就会全部丢失。若要测光的相位，还须在接收机那一端有另外的激光进行干涉，把相位信息转成强度信息，这个就叫相干接收机。有了相干接收机后，光通信系统就变成相干光通信系统。”余长源解释道。因公认具有灵敏度高的优势，各国相干光通信的理论和实验早在20世纪80年代就热烈展开，但随后因掺铒光纤放大器发展的影响，归于沉寂。然而当时间来到2005年，互联网普及，信息爆炸式增长，对作为整个通信系统基础的物理层提出了更高的传输性能要求。传统光通信系统频谱效率有限，如何在现有设备基础上提高光通信系统的容量与性能成为产业界和学术界面临的切实问题。

由此，20多年前曾被寄予厚望的相干光通信技术，再次被人们想起来。余长源和他的光电系统研究小组，成为相干光通信这一波研究的弄潮儿。“我们幸运的地方在于，率先获得新加坡科技研究局及教育部在这方面的科研资助，成为这一时期最早一批的研究者。为了解决在没有光学锁相环的情况下进行载波恢复的关键难题，我和团队成员借用了无线通信的一些算法，还有成员发明了相位估计的新算法。这些成果在学界引起了广泛反响，根据2016年加拿大科学院理事会的调查，我们关于相干光学系统数字载波恢复的论文引用量为领域内的前1%。我指导的博士生中有6人因为这方面的研发成果获得了博士学位。”

当下，全球互联网用户规模已突破80亿（超过人口总数）。以香港为例，人均拥有超过3部终端电子设备上网。而根据研究，未来10～15年，全球光纤传输最大截面流量将达到1000 Tbps，单纤超过100 Tbps。用户数量和网络流量的迅猛增长对现有光通信提出新的挑战。P比特级（1000 Tbps）光传输系统与关键技术的研究被提上了日程。“美国、日本及欧洲，均已开始对基于少模多芯复用的高谱效率光传输系统展开研究，但是针对P比特传输系统的关键问题尚未突破。尤其是正交模式关联传输等理论尚未成熟。”在此背景下，余长源带领团队依托国家重点研发计划“宽带通信和新型网络”重点专项，针对关键科学问题——少模多芯信号的正交关联传输问题、高谱效率P比特光信号的调制解调问题、长距离传输中的多通道信号损伤与联合补偿问题进行研究。预计基于DSP的高频谱效率Nyquist强滤波，实现超密集载波复用；通过对星座图的概率整形，提升高阶信号的信噪比；解决单通道高谱效率光信号的抗噪声问题。

除了通信容量的增加，通信能耗问题也日益突出。2020年通信能耗已占全球总能耗的5%，市场渴求更快的处理器和更高的带宽传输。依托深圳自然科学基金重点基础研究计划，余长源对面向数据中心的光互连系统及关键技术展开了研究。针对如何进一步扩展容量、如何进一步降低成本、如何进一步降低功耗的问题进行探索。目前，他正领导团队深入研发系列创新技术，包括基于交错载波的双偏振KK接收机，实现双偏振信息传输和接收；采用Kalman滤波器快速获取偏振跟踪信息；基于少模多芯光纤的矩阵式多域协同优化光互连传输机理研究等。

在光纤通信领域，余长源的贡献还体现在光信号监测、可见光通信、自由空间光学（FSO）系统的研究上，发表了一系列高质量论文，被斯坦福大学评为全球前2%被引用次数最多的科学家，也多次获得香港理工大学工程学院的优秀科研学术奖及科研经费成就奖。值得一提的是，在自由空间光学系统上，他还带领团队参与了我国空间站光学舱巡天望远镜粤港澳大湾区科学中心的工作，助力我国航天事业的发展。此外，他积极跟产业界合作，参与了华为公司的长距离相干光通信、短距离光互连、空间光无线通信系统等一系列重要研发项目，成绩斐然，助力中国企业的崛起。

回首20世纪90年代，虽然已经有华为、中兴、武汉邮电科学研究院、北京邮电大学等这样的企业、研究院所和高校在进行自主研发，但中国的光纤通信研究整体上仍然落后。然而“三十年河东，三十年河西”，当余长源满载硕果回到祖国，这些中国的“追光者”已来到了技术追赶的最后阶段，如今历时近10年，在学术界和产业界的一道努力下，中国的光纤通信研究尤其是系统集成领域终于迈进了与国际水平并行乃至引领的新纪元。余长源十分庆幸亲历并见证了这段滔滔浪潮，不仅在其中贡献了科研力量，也实现了自我的积淀与突破。 

创新创业，投身传感与成像 

学术研究外，余长源也鼓励他的学生在毕业后抓住时代机遇、创新创业。

当光在光纤中传播时，在外界温度、压力、位移等因素作用下，光波的振幅、相位、偏振态等参量会直接或间接地发生变化，因而可将光纤作为敏感元件来探测各种物理量，催生了光纤传感的发展。如何利用信号处理的方法，将光纤传感性能做进一步提升，是余长源在光纤通信的研究之外尝试的另一项重要研究工作。而且，对比光纤通信，光纤传感对设备与资金投入的要求较小，是更适合初创公司的领域。

因为电绝缘、耐高温、不受电磁干扰（EMI）影响、灵敏度高，集信息感知与传输功能于一体，光纤传感器系统起初被用于高电压、易燃易爆、高危特种行业安全生产监测。早在新加坡工作期间，余长源与资讯通信研究院的同事就开始尝试光纤传感在生物医疗领域的应用，包括研发非侵入式的智能光纤健康监测系统：系统可实时监测呼吸、心跳等多种生命体征，然后将信号传输到智能手机和互联网，获取用户的坐姿、睡姿、睡眠阶段和健康状况等信息，最终构建基于大数据的健康监测平台。基于光纤微弯损耗传感技术，余长源的博士生胡俊浩在毕业后建立了硅谷初创公司（Darma.co），开发光纤传感健康监测的系统与平台。谷歌创始人拉里·佩奇（Larry Page）在路演期间测试了产品原型，被美国广播公司（ABC）等20多家美国媒体报道。

“香港理工大学的设备可以用于多种新型光纤的制造，在这里我继续进行光纤传感的研究。”基于学校的硬件优势及多年光纤传感技术的积淀，余长源带领团队制作了双芯光纤干涉传感生命体征监测仪，从光的强度测量过渡到相位测量，得到更精准的测量结果，并在《光电进展》（Opto-Electronic Advances）发表了综述文章。团队跟香港的慈善机构合作，将这款监测仪用于阿尔茨海默病及相关痴呆症远程活动监测系统，便利了医护人员的工作。学生团队又将相关技术用于汽车驾驶领域，“基于光纤干涉仪的汽车驾驶员智能健康监测系统”项目在2020年第六届全国大学生3S杯物联网技术与应用“三创”竞赛中，打败600多个竞争对手，获得一等奖；之后又在广东省“众创杯”创业创新大赛中，与1916名竞争对手同台竞技，斩获银奖；研究论文《基于多芯光纤干涉仪的无创智能监测系统》在2018年中国杭州举办的亚洲通信与光子学会议（ACP，在中国举办的光通信领域顶级会议）上脱颖而出，获得最佳海报奖。

“我的另一名学生王碧炜，在沙特阿拉伯大学交换学习时，跟当地的石油公司合作，利用光时域反射和分布式传感的原理，将光纤传感技术用于油气领域的井下监测、油气管道监测等方面。”毕业后，王碧炜博士和毛渊博士共同创立了艾克森光电科技（中山）公司，主要产品便是分布式光纤声波传感器，致力于在石油/天然气、周界安全、轨道交通、智慧农业等领域的应用，与国际上的同类传感器相比，可测信号更精细，测量结果更稳定。

光电信息技术的另一个重要应用是成像。超表面是指一种亚波长的二维人造材料，可实现对电磁波偏振、振幅、相位等特性的灵活有效调控。它颠覆传统光学原理（反射/折射定律），尺寸小、易集成，光学设计自由度高。依据超表面材料制作的超透镜，被《科学》（Science）期刊评为2016年十大科技突破之一，相比传统镜头的笨重，它微型化、易集成，应用市场广阔，可望掀起成像系统的革命。余长源的团队开展了超表面光纤器件的前沿研究，取得不少成果。他的博士生郝成龙、谭凤泽等毕业后创建了深圳迈塔兰斯科技有限公司，对超透镜的量产和透过率难题进行了攻关，致力于将平面超透镜技术广泛应用于消费电子类、安防监控、汽车电子、光通信及AR/VR等领域，引领相关光学产业技术的变革。2020年以来，此公司已获得各类创新创业大赛荣誉8项，融资近2亿元人民币，技术成果和应用成效备受好评。

2022年年底，亚洲通信与光子学会议在深圳举办，余长源团队李玉建等学生的论文《基于游标效应的双芯单孔光纤同时测量轴向应变和温度》获得厉鼎毅最佳论文奖。此奖项的设立是为了缅怀继高锟之后的光纤通信领域泰斗、波分复用系统之父厉鼎毅博士。他也是维尔纳教授在贝尔实验室做博士后研究时的华人导师。在余长源眼里，包括他的导师、他自己，以及他的学生在内，至少三代人，都曾受到这位大师的引领与指导。如今大师虽已驾鹤西去，但光纤领域的中华力量仍在继续活跃，中国光纤研究正在世界舞台大放光彩。“我们团队的最新论文获厉鼎毅奖，就是对大师最好的纪念。过去20多年间，我有幸在光电信息领域持续工作，亲历了历史：朋辈成长为海内外光通信的中坚力量，中国在本领域研发从相对落后到开始领先；中国通信市场从七国八制、外国通信公司在华利润超过鸦片，到华为等中国公司崛起、极大降低国人通信费用并参与国际竞争；我留美初期越洋电话每分钟几美元，到现在低成本网络连接世界各个角落。这翻天覆地的变化，是师、友、学生几代人扎扎实实干出来的。作为光纤通信传感领域的后辈，我们也将在高锟先生、厉鼎毅先生开创的道路上继续努力奋斗下去！”
 

专家简介：

余长源，香港理工大学电子及资讯工程学系教授、博士生导师，美国光学学会会士。1997年获清华大学应用物理和企业管理双学士学位，1999年获美国迈阿密大学电子与计算机工程硕士学位，2005年获美国南加州大学电子工程博士学位。2005年至2015年在新加坡国立大学电子与计算机工程系任教，创立光电系统研究小组，并兼任新加坡科技研究局资讯通信研究院高级研究员，2015年12月加入香港理工大学。主持/共同主持50多个研究项目，先后指导了20余名博士后研究员和40余名博士生。其团队曾获10次国际会议最佳论文奖，以及2014年第三届中国创新创业大赛全国总决赛生物医药行业团队组冠军。他撰写/合著了6个书籍章节及600余篇期刊/会议论文（100余篇主题/特邀报告，包括全球光通信领域以规格高、专业性强著称的美国光纤通信会议OFC）。此外，他还曾担任100余个国际学术会议的组委会/技术委员会的主席或成员，以及新加坡政府资讯通信发展管理局技术顾问委员会委员。

 来源：科学中国人  2023年11期