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.
DISPERSION
Digital communication
Channel models
TRANSMISSION
SPECTRAL EFFICIENCY
Optical fiber communication
CAPACITY
INTERLEAVED CODED MODULATION
SYSTEMS
Mutual Information
INFORMATION RATES
Fiber nonlinear optics
NETWORKS
DISTANCE
FIBER
Author
Tobias Eriksson
Chalmers, Microtechnology and Nanoscience (MC2), Photonics
Tobias Fehenberger
Technical University of Munich
Peter Andrekson
Chalmers, Microtechnology and Nanoscience (MC2), Photonics
Magnus Karlsson
Chalmers, Microtechnology and Nanoscience (MC2), Photonics
Norbert Hanik
Technical University of Munich
Erik Agrell
Chalmers, Signals and Systems, Communication, Antennas and Optical Networks
Journal of Lightwave Technology
0733-8724 (ISSN) 1558-2213 (eISSN)
Vol. 34 9 2256-2266 7404211Areas of Advance
Information and Communication Technology
Subject Categories
Telecommunications
Communication Systems
DOI
10.1109/JLT.2016.2528550