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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 20, Iss. 7 — Mar. 26, 2012
  • pp: 7915–7928

Analysis of soft-decision FEC on non-AWGN channels

Junho Cho, Chongjin Xie, and Peter J. Winzer  »View Author Affiliations

Optics Express, Vol. 20, Issue 7, pp. 7915-7928 (2012)

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Soft-decision forward error correction (SD-FEC) schemes are typically designed for additive white Gaussian noise (AWGN) channels. In a fiber-optic communication system, noise may be neither circularly symmetric nor Gaussian, thus violating an important assumption underlying SD-FEC design. This paper quantifies the impact of non-AWGN noise on SD-FEC performance for such optical channels. We use a conditionally bivariate Gaussian noise model (CBGN) to analyze the impact of correlations among the signal’s two quadrature components, and assess the effect of CBGN on SD-FEC performance using the density evolution of low-density parity-check (LDPC) codes. On a CBGN channel generating severely elliptic noise clouds, it is shown that more than 3 dB of coding gain are attainable by utilizing correlation information. Our analyses also give insights into potential improvements of the detection performance for fiber-optic transmission systems assisted by SD-FEC.

© 2012 OSA

OCIS Codes
(060.1660) Fiber optics and optical communications : Coherent communications
(060.2330) Fiber optics and optical communications : Fiber optics communications
(060.5060) Fiber optics and optical communications : Phase modulation

ToC Category:
Fiber Optics and Optical Communications

Original Manuscript: November 9, 2011
Revised Manuscript: February 20, 2012
Manuscript Accepted: March 10, 2012
Published: March 21, 2012

Junho Cho, Chongjin Xie, and Peter J. Winzer, "Analysis of soft-decision FEC on non-AWGN channels," Opt. Express 20, 7915-7928 (2012)

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