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.

Key words: concatenated code, optical transmission systems, super forward error correction, net coding gain