Abstract

In this paper, we study the effects of different ASE noise models on the performance of turbo code (TC) decoders. A soft-decoding algorithm,the Bahl, Cocke, Jelinek, and Raviv (BCJR) decoding algorithm <citegrp><citeref rid="ref1], is generally used in the TC decoders. The BCJR algorithm is a maximum a posteriori probability (MAP) algorithm, and is very sensitive to the noise statistics. The Gaussian approximation of the ASE noise is widely used in the study of optical-fiber communication systems [2"type="ref"></citeref><citeref rid="ref3"type="ref"></citeref><citeref rid="ref4"type="ref"></citeref> <citeref rid="ref5"type="ref"></citeref><citeref rid="ref6"type="ref"></citeref> <citeref rid="ref7"type="ref"></citeref><citeref rid="ref8"type="ref"></citeref> </citegrp>, and there exist standard TCs for additive white Gaussian noise (AWGN) channels. We show that using a MAP decoding algorithm based on the Gaussian noise assumptions, however, may significantly degrade the TC decoder performance in an optical-fiber channel with non-Gaussian ASE noise. To take full advantage of TC, the accurate noise statistics in optical-fiber transmissions should be used in the MAP decoding algorithm.

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  1. D. Marcuse, "Derivation of analytical expressions for the bit-error probability in lightwave systems with optical amplifiers", J. Lightwave Technol., vol. 8, pp. 1816-1823, Dec. 1990.
  2. P. A. Humblet and M. Azizoglu, "On the bit error rate of lightwave systems with optical amplifiers", J. Lightwave Technol., vol. 9, pp. 1576-1582, Nov. 1991.
  3. R. Holzlöhner, V. S. Grigoryan, C. R. Menyuk and W. L. Kath, "Accurate calculation of eye diagrams and bit error rates in optical transmission systems using linearization", J. Lightwave Technol., vol. 20, pp. 389-400, Mar. 2002.
  4. P. J. Winzer, M. Pfennigbauer, M. M. Strasser and W. R. Leeb, "Optimum filter bandwidths for optically preamplified RZ and NRZ receivers", J. Lightwave Technol., vol. 19, pp. 1263-1273, Nov. 2001.

J. Lightwave Technol. (4)

D. Marcuse, "Derivation of analytical expressions for the bit-error probability in lightwave systems with optical amplifiers", J. Lightwave Technol., vol. 8, pp. 1816-1823, Dec. 1990.

P. A. Humblet and M. Azizoglu, "On the bit error rate of lightwave systems with optical amplifiers", J. Lightwave Technol., vol. 9, pp. 1576-1582, Nov. 1991.

R. Holzlöhner, V. S. Grigoryan, C. R. Menyuk and W. L. Kath, "Accurate calculation of eye diagrams and bit error rates in optical transmission systems using linearization", J. Lightwave Technol., vol. 20, pp. 389-400, Mar. 2002.

P. J. Winzer, M. Pfennigbauer, M. M. Strasser and W. R. Leeb, "Optimum filter bandwidths for optically preamplified RZ and NRZ receivers", J. Lightwave Technol., vol. 19, pp. 1263-1273, Nov. 2001.

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