Title: Recent Efforts on Coherent Optical Communication and Visible Light Wireless
Speaker: Dr. Jian Chen(Institute for Infocomm Research，Singapore)
Time: 3:30(pM), Nov.24, 2009
Venue: Academic Meeting Room, Institute of Semiconductors, CAS
Abstract：The key obstacle for applying coherent optical communication with synchronous detection is the requirement of recovering the optical carrier phase, since optical phase-locked loop (PLL) is difficult to implement. We report our efforts to use electrical digital signal processing (DSP) based on decision-aided maximum likelihood (DA-ML) carrier phase estimation to approximate the ideal synchronous coherent detection in optical phase modulation systems, so as to eliminate the optical PLL.DA-ML can also improve the performance of the transmission systems in the presence of fiber degrading effects, including chromatic dispersion, PMD, and fiber nonlinearities. We also report our adaptive DA-ML scheme for practical implementation. In the second part of the talk, we report our efforts and strategy to integrate communication functionality to augment / complement existing services by next-generation energy-saving white LED lighting infrastructure. The requirements / challenges for new material, device and system integration with underlying lighting are investigated in detail. Finally we review some relevant on-going IEEE standardization activities related to lightwave communications.
About Speaker：
Dr. Jian Chen received the B.S., M.S., and Ph. D. degrees in electronic engineering from Southeast University, Nanjing, People's Republic of China (PRC), in 1988, 1990, and 1994, respectively. From 1999 to 2001, he was with the Department of Electrical Engineering of the Korea Advanced Institute of Science and Technology (KAIST), Daejeon, Korea, where he was involved in research and development of fiber nonliear effects and fiber Raman amplifiers for high-capacity wavelength-division-multiplexing (WDM) transmission systems. In 2002, he was with the Institute for Communication Research of National University of Singapore (NUS) as member of technical staff. From 2003, he joined the Communications & Devices Division of the Institute of Infocomm Research (I2R) as a research scientist, Singapore. He has been engaged in research on optical access networks, 100 Gbps/s coherent fiber optical communication and indoor visible light wireless. He is currently a voter of IEEE 802 standardization committee and an editor of Singapore next generation broadband network standardization committee.