Impact of 4D Channel Distribution on the Achievable Rates in Coherent Optical Communication Experiments
Journal article, 2016
We experimentally investigate mutual information and generalized mutual information for coherent optical transmission systems. The impact of the assumed channel distribution on the achievable rate is investigated for distributions in up to four dimensions. Single channel and wavelength division multiplexing (WDM) transmission over transmission links with and without inline dispersion compensation are studied. We show that for conventional WDM systems without inline dispersion compensation, a circularly symmetric complex Gaussian distribution is a good approximation of the channel. For other channels, such as with inline dispersion compensation, this is no longer true and gains in the achievable information rate are obtained by considering more sophisticated four-dimensional (4D) distributions. We also show that for nonlinear channels, gains in the achievable information rate can also be achieved by estimating the mean values of the received constellation in four dimensions. The highest gain for such channels is seen for a 4D correlated Gaussian distribution.
SYSTEMS
Channel models
INFORMATION RATES
DISTANCE
Fiber nonlinear optics
TRANSMISSION
NETWORKS
SPECTRAL EFFICIENCY
CAPACITY
Mutual Information
Optical fiber communication
FIBER
INTERLEAVED CODED MODULATION
Digital communication
DISPERSION
Author
Tobias Eriksson
Chalmers, Microtechnology and Nanoscience (MC2), Photonics
Tobias Fehenberger
Technische Universitat Munchen
Peter Andrekson
Chalmers, Microtechnology and Nanoscience (MC2), Photonics
Magnus Karlsson
Chalmers, Microtechnology and Nanoscience (MC2), Photonics
Norbert Hanik
Technische Universitat Munchen
Erik Agrell
Chalmers, Signals and Systems, Kommunikationssystem, informationsteori och antenner
Journal of Lightwave Technology
0733-8724 (ISSN)
Vol. 34 9 2256-2266 7404211Areas of Advance
Information and Communication Technology
Subject Categories (SSIF 2011)
Telecommunications
Communication Systems
DOI
10.1109/JLT.2016.2528550