A늌W

2009 Seminar

20090808(Stanford, CA)

                                        Hybrid Fiber Coax (HFC) for Digital TV, Voice, and High Speed Internet Services

 

Abstract:

Cable TV companies signal distribution infrastructure is HFC (Hybrid Fiber Coax). The HFC system have to support vast bandwidth demand for hundred channels HDTV, high spped internet, and quality of service (QoS) for real-time data, such as voice over IP (VoIP), video on demand (VoD) and other multimedia services, telephony service signals. The principle and applications of technologies use in HFC to mitigate the bandwidth demain and to provide bandwidth efficiency in HFC system are the focus of the seminar. The technologies including digital compression, QAM modulation, FDM (Frequency Division Multiplexing) , WDM (Wavelength Division Multiplexing) , digital return path, and DOCSIS (Data over cable service interface specifications) . The HFC transmission system architecture and transmission distance enhencement and bandwidth utilization will also be presented.

Biography:

Nelson M. Shen, Ph.D. ľ ʿ
Biographical Info 

Nelson M. Shen, Ph.D., is a 30-year fiber optics industry veteran in Cable TV/Telecom/Data communication systems/components. He is currently work in development of fiber optics communications equipment for Hybrid Fiber Coax system (HFC) in Harmonic, Inc. Before Harmonic, Nelson developed fiber optics system/equipment/ component at Cisco System, Inc. San Jose, California, at Raychem/Raynet in Menlo Park, California, at GTE in Mountain View, California and other start up companies. He served as Engineer, VP, or CTO positions in one or more of the companies. 

Over the course of his career, Nelson has been associated with a number of areas of technical development resulting in the creation of intellectual property such as optical fiber splicers, optical fiber couplers, optical switches, optical isolator, optical fiber sensors, optical transmitters and receivers, coaxial connectors, and electronic packaging systems. He has worked on more than 16 successfully granted fiber optics and technology patents.

Nelson earned a B.S. in Physics from Chung Yuan Christian University, and a Ph.D. in Laser Spectroscopy from the University of Texas at Dallas.