光通信系统中一种新颖的级联码型

Novel concatenated code type for optical communication systems

基于级联码对光通信系统中级联码特性和ITU-T G.975.1中两种超强前向纠错(SFEC)码型进行分析和研究后,提出了一种新颖的RS(255,239)+BCH(1023,963)级联码型。仿真表明,该码型与ITU-T G.975.1中RS(255,239)+CSOC(k0/n0=6/7,J=8)码相比较,具有更低的冗余度和更好的纠错性能,并且在经过三次迭代且误码率(BER)为10-12时其净编码增益(NCG)比ITU-T G.975.1中RS(255,239)+CSOC(k0/n0=6/7,J=8)码和BCH(3860,3824)+BCH(2040,1930)码要分别大0.60dB和0.57dB。因而,它更适用于超长距离、超大容量和超高速的光通信系统中,并可以作为SFEC码的一种候选码型。

A novel concatenated code type of RS（255, 239）＋BCH（1023, 963） is proposed after analyzing and studying the characteristics of the concatenated code for optical communication systems and the two Super Forward Error Correction（SFEC） code types in ITU-T G.975.1. The simulation results show that this novel code type, compared with the RS（255, 239）＋ CSOC（k0/n0=6/7, J=8） code in ITU-T G.975.1, has a lower redundancy and the better error-correction performance, furthermore, its net coding gain（NCG） is respectively 0.60dB and 0,57dB more than that of RS（255,239）＋ CSOC（k0/n0=6/7, d=8） code and BCH（3860, 3824）＋BCH（2040, 1930） code in ITU-T G975.1 at the third iteration for the bit error rate （BER） of 10^-12. Therefore, the novel concatenated code type can be better used in ultra long-haul, ultra large-capacity and ultra high-speed optical communication systems. Furthermore, it can be regarded as a candidate code type of the SFEC codes.