Nonlinear BCJR equalizer for suppression of intrachannel nonlinearities in 40 Gb/s optical communications systems

被引：20

作者：

Djordjevic, Ivan B. ^{[1
]}

Vasic, Bane ^{[1
]}

机构：

[1] Univ Arizona, Dept Elect & Comp Engn, Tucson, AZ 85721 USA

来源：

OPTICS EXPRESS | 2006年 / 14卷 / 11期

关键词：

D O I：

10.1364/OE.14.004625

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

A maximum a posteriori probability ( MAP) symbol decoding supplemented with iterative decoding is proposed as an effective mean for suppression of intrachannel nonlinearities. The MAP detector, based on Bahl-Cocke-Jelinek-Raviv algorithm, operates on the channel trellis, a dynamical model of intersymbol interference, and provides soft-decision outputs processed further in an iterative decoder. A dramatic performance improvement is demonstrated. The main reason is that the conventional maximum-likelihood sequence detector based on Viterbi algorithm provides hard-decision outputs only, hence preventing the soft iterative decoding. The proposed scheme operates very well in the presence of strong intrachannel intersymbol interference, when other advanced forward error correction schemes fail, and it is also suitable for 40 Gb/s upgrade over existing 10 Gb/s infrastructure. (c) 2006 Optical Society of America.

引用

页码：4625 / 4635

页数：11

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