Title :
Constrained coding techniques for the suppression of intrachannel nonlinear effects in high-speed optical transmission
Author :
Djordjevic, Ivan B. ; Vasic, Bane
Author_Institution :
Dept. of Electr. & Comput. Eng., Univ. of Arizona, Tucson, AZ, USA
Abstract :
A problem of suppression of intrachannel nonlinearities through the use of constrained coding is considered. Three different techniques are proposed and compared with respect to their efficiency, namely 1) constrained coding; 2) combined constrained and error control coding; and 3) deliberate error insertion. Significant Q-factor improvement up to 16 dB depending on code rate and number of spans is demonstrated. A combined constrained-iterative forward error correction (FEC) scheme can operate in the presence of strong intrachannel nonlinearities when even advanced FEC schemes would be overwhelmed with errors. It provides a coding gain of 12.1 dB at a bit error rate (BER) of 10-9. Deliberate error insertion is an efficient approach to balance the encoder complexity and the achievable coding gain.
Keywords :
Q-factor; encoding; error statistics; forward error correction; iterative methods; optical fibre communication; telecommunication channels; 12.1 dB; FEC; Q-factor; bit error rate; code rate; coding gain; constrained coding; constrained-iterative forward error correction; deliberate error insertion; intrachannel nonlinear effect suppression; Bit error rate; Error correction; Forward error correction; Four-wave mixing; Gain; High speed optical techniques; Iterative decoding; Nonlinear optics; Optical mixing; Parity check codes; Constrained coding; intrachannel cross-phase modulation; intrachannel four-wave mixing; optical communications;
Journal_Title :
Lightwave Technology, Journal of
DOI :
10.1109/JLT.2005.860139
