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Information rates of next-generation long-haul optical fiber systems using coded modulation

Gabriele Liga ; Alex Alvarado Segovia ; Erik Agrell (Institutionen för signaler och system, Kommunikationssystem) ; Polina Bayvel
Journal of Lightwave Technology (07338724). Vol. PP (2016), 99, p. Art. no. 7553569.
[Artikel, refereegranskad vetenskaplig]

A comprehensive study of the coded performance of long-haul spectrally-efficient WDM optical fiber transmission systems with different coded modulation decoding structures is presented. Achievable information rates are derived for three different square QAM formats and the optimal format is identified as a function of distance and specific decoder implementation. The four cases analyzed combine hard-decision (HD) or softdecision (SD) decoding together with either a bit-wise or a symbol-wise demapper, the last two suitable for binary and nonbinary codes, respectively. The information rates achievable for each scheme are calculated based on the mismatched decoder principle. These quantities represent true indicators of the coded performance of the system for specific decoder implementations and when the modulation format and its input distribution are fixed. In combination with the structure of the decoder, two different receiver-side equalization strategies are also analyzed: electronic dispersion compensation and digital backpropagation. We show that, somewhat unexpectedly, schemes based on nonbinary HD codes can achieve information rates comparable to SD decoders and that, when SD is used, switching from a symbol-wise to a bit-wise decoder results in a negligible penalty. Conversely, from an information-theoretic standpoint, HD binary decoders are shown to be unsuitable for spectrally-efficient, long-haul systems.

Nyckelord: Achievable information rates; coded modulation; forward error correction; generalized mutual information; hard-decision decoding; mutual information; nonbinary codes; optical communications; soft-decision decoding

Denna post skapades 2016-12-19. Senast ändrad 2017-03-31.
CPL Pubid: 246213


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Institutionen för signaler och system, Kommunikationssystem (1900-2017)


Annan elektroteknik och elektronik

Chalmers infrastruktur