The Optical Networking and Communication
Conference & Exhibition

Los Angeles Convention Center,
Los Angeles, California, USA

SC105 - Modulation Formats and Receiver Concepts for Optical Transmission Systems

Sunday, 19 March
09:00 - 13:00

Short Course Level: Advanced Beginner


Peter Winzer, Chandrasekhar Sethumadhavan; Bell Labs, Alcatel-Lucent, USA

Short Course Description:

The ever-increasing traffic demands in carrier networks, driven by emerging data-centric services and applications, have led to intense research and development in the area of high-capacity (several 10 Tbit/s), high-speed (up to 400 Gb/s per wavelength) optical transport networks. In order to enable such high capacities and speeds over appreciable transmission distances (>1000 km), spectrally efficient yet impairment-tolerant transmission technologies have moved into the focus of optical communications research and have led to considerable innovation in modulation and detection strategies. This course gives an overview of modulation formats and multiplexing techniques for optical networking applications, both from a conceptually fundamental and from a state-of-the-art technological point of view. The discussed modulation formats include intensity modulation, phase modulation, and quadrature amplitude modulation; multiplexing techniques include wavelength division multiplexing (WDM), polarization division multiplexing (PDM), subcarrier multiplexing, discrete multi-tone (DMT), and orthogonal frequency division multiplexing (OFDM), and also an introduction to space division multiplexing (SDM) as the currently emerging research frontier, heavily discussed throughout the conference sessions. The course covers optical receiver design and optimization principles, both for direct-detection and digital coherent (intradyne) receivers, including some basic discussion of the underlying digital electronic signal processing (DSP) at both the receiver and the transmitter, as well as some fundamentals of error correcting coding techniques from a systems perspective. Finally, the course highlights the interplay of modulation format, receiver design, and the wide variety of transmission impairments found in optically routed long-haul networks and points to latest research trends in optical modulation and multiplexing.

Short Course Benefits:

This course should enable you to:

  • Describe the basic concepts behind optical modulation and multiplexing techniques.

  • Explain the basic concepts behind advanced optical modulation formats, their performance, and their generation using state-of-the-art opto-electronic components and digital signal processing.

  • Explain the basic concepts of optical receiver design, including direct and coherent detection as well as related digital signal processing techniques.

  • Recognize and discuss the interplay between modulation format, transceiver design, and transmission impairments.

  • Get an insight into future trends in research and product commercialization of optical transport systems enabled by advanced modulation and multiplexing techniques, software-defined transceivers, and flexible WDM architectures.

Short Course Audience:

This advanced-beginner course is intended for a diverse audience including lightwave system researchers and engineers as well as opto-electronic subsystem designers. Some basic knowledge of optical modulation and detection technologies will help in better understanding the course but is not a prerequisite. Past attendees will find substantial updates to this course, which we continuously adapt to reflect the latest trends in research as well as in product development, and may hence find it useful to attend again.

Instructor Biography:

Peter J. Winzer received his doctorate in electrical engineering/communications engineering from the Vienna University of Technology, Vienna, Austria, in 1998. His academic work, largely supported by the European Space Agency (ESA), was related to the analysis and modeling of space-borne Doppler wind lidar and highly sensitive free-space optical communication systems. In this context, he specialized in optical modulation formats and high-sensitivity receivers using coherent and direct detection. He continued to pursue this field of research after joining Bell Labs in 2000, where he focused on Raman amplification, optical modulation formats, advanced receiver concepts, as well as digital signal processing and multiplexing techniques for  high-speed fiber-optic communication. 

S. Chandrasekhar (M’89, SM’00, F’01) received the B.Sc., M.Sc., and Ph.D. degrees in physics from the University of Bombay, Bombay, India, in 1973, 1975, and 1985, respectively. He was at the Tata Institute of Fundamental Research, Bombay, India, from 1975 to 1985. He joined AT&T Bell Laboratories (later called Lucent Technologies, Bell Laboratories, then Alcatel-Lucent, Bell Labs, and now Nokia Bell Labs), Crawford Hill Laboratory, Holmdel, NJ, in 1986. He initially worked on compound semiconductor devices and high-speed optoelectronic integrated circuits (OEIC's). Since January 1999, he has been responsible for forward looking research in WDM Optical Networking at 40Gb/s, 100Gb/s and beyond 100Gb/s. His current interests include coherent optical transmission systems for high spectral efficiency transport and networking beyond 100Gb/s, multi-carrier superchannels, and software-defined transponders for efficient end-to-end optical networking. He is a Fellow of the IEEE, a Fellow of the Optical Society of America, and Fellow, Nokia Bell Labs. He served as an Associate Editor of IEEE Photonics Technology Letters for over ten years, and is currently an Associate Editor of Optics Express. He holds over 30 US patents and has published over 250 peer-reviewed journal articles. He was awarded the IEEE LEOS Engineering Achievement Award in 2000 and the OSA Engineering Excellence Award in 2004 for his contributions to OEICs and WDM systems research. He was recognized as a member of the “100Gb/s Coherent (Long Haul – High Capacity WDM Interface) Team” that was the receipient of the 2010 Bell Labs President’s Award.

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