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Optica Publishing Group
  • Journal of Lightwave Technology
  • Vol. 21,
  • Issue 2,
  • pp. 438-
  • (2003)

Low-Density Parity Check Codes and Iterative Decoding for Long-Haul Optical Communication Systems

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Abstract

A forward-error correction )FEC) scheme based on low-density parity check (LDPC) codes and iterative decoding using belief propagation in code graphs is presented in this paper. We show that LDPC codes provide a significant system performance improvement with respect to the state-of-the-art FEC schemes employed in optical communications systems. We present a class of structured codes based on mutually orthogonal Latin rectangles. Such codes have high rates and can lend themselves to very low-complexity encoder/decoder implementations. The system performance is further improved by a code design that eliminates short cycles in a graph employed in iterative decoding.

[IEEE ]

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