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Low-density parity check codes and iterative decoding for long-haul optical communication systems

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3 Author(s)
B. Vasic ; Dept. of Electr. & Comput. Eng., Univ. of Arizona, Tucson, AZ, USA ; I. B. Djordjevic ; R. K. Kostuk

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.

Published in:

Journal of Lightwave Technology  (Volume:21 ,  Issue: 2 )