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||Information Theory Applied to Fiber-optic Transmission: Limits to Spectral Efficiency of Optical Fibers Due to the Kerr Nonlinearity
||Dr. René-Jean Essiambre
Distinguished Member of Technical Staff
Bell-Labs, Alcatel-Lucent, Crawford Hill, NJ
|Day and Time
Friday, April 25, 2008, 11:00 a.m.
||Room BA 1170, Bahen Centre for Information Technology
University of Toronto
40 St. George Street
map - select BA
Circuits & Devices Joint Chapter and Communications Chapter
Emanuel Istrate, E-mail:
Fiber-optic communication systems constitute the backbone of
the communication network infrastructure. The main physical elements
of the optical paths in these networks are the optical fiber (as the
physical medium for transport) and the optical amplifier (to combat
signal attenuation). The transmission bandwidth available over each
optical path is enormous, on the order of 10 THz. Despite such a large
bandwidth being available, there is a tremendous demand to increase
the capacity of fiber-optic communication systems by increasing
spectral efficiencies to multiple bits/s/Hz while still maintaining
transmission distances on the order of a few thousands of kilometers.
Achieving such high spectral efficiency requires using signals with
multiple levels in phase and/or amplitude, and possibly using both
states of polarization. Transmission of such multilevel signals
becomes increasingly impacted by the Kerr fiber nonlinearity, a
physical phenomenon unique to the ‘fiber channel’. The Kerr
nonlinearity results in signal distortions that rapidly increase with
signal power. The question then arises: how to apply Shannon’s
information theory to the `fiber channel’ and is there a maximum
spectral efficiency associated to the Kerr fiber nonlinearity?
In this talk, we will describe how we applied Shannon’s theory to the
`fiber channel’ and present the early results in the direction of
conservatively estimating the fiber capacity. A spectral efficiency of
~5 bits/s/Hz (in a single polarization) for transmission over 2000 km
in an optically-routed network will be shown to be achievable.
René-Jean Essiambre, Ph.D., is a researcher at Bell Laboratories,
Alcatel-Lucent, where he is conducting research on management of fiber
nonlinearities and in the design of fiber-optic communication systems.
His recent interest includes capacity limits of fiber-optic networks
due to fiber nonlinearity, optimization techniques for the design of
optical networks, advanced modulation formats, optical phase
conjugation and optical regeneration in the context of increasing
capacity, reach and functionality of wavelength-division multiplexed
Dr. Essiambre has served on the European Conference on Optical
Communication (ECOC) and Optical Fiber Communication (OFC) committees.
He is a recipient of the 2005 “Engineering Excellence Award” from the
Optical Society of America and is Fellow of the same society as well
as a senior member of the IEEE. He is currently a Distinguished member
of Technical Staff (DMTS) at Bell Laboratories at Alcatel-Lucent.