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Study on the Novel Super-FEC Concatenated Code for Optical Transmission Systems

Sheng Gu

Abstract

The main construction methods of the forward error correction(FEC) code type for optical transmission systems are proposed and a novel super forward error correction(Super-FEC) concatenated code of RS(255,239)+BCH(2?040,1?930) to be applied for optical transmission systems is constructed after the characteristics of the concatenated code for optical transmission systems and the two super forward error correction(Super-FEC) code types in ITU-T G.975.1 ere analyzed.The simulation results show that this novel concatenated code,comparing with the RS(255,239)+CSOC(k0/n0=6/7,J=8) code in ITU-T G.75.1,has a lower redundancy and the better error-correction performance.Furthermore,its net coding gain(NCG) is respectively 0.45?dB,0.48?dB more than that of BCH(3?860,3?824)+BCH(2?040,1?930) code and RS(255,239)+CSOC(k0/n0=6/7,J=8) code in ITU-T G.75.1 and 2.81?dB more than that of RS(255,239) code at the third iteration for the bit error rate of 10-12.Therefore,the novel Super-FEC concatenated code can better be used in optical transmission systems.

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Key concepts: Forward error correction, BCH code, Constant-weight code, Coding gain, Computer science, Error detection and correction, Code rate, Concatenated error correction code