光传输系统中的新颖超强FEC级联码

基于级联码对光传输系统中级联码特性和ITU-T G.975.1中2种超强前向纠错（Super-FEC）码型进行分析后，提出了光传输系统中FEC码型的主要构造方法并构造了一种适用于光传输系统中的新颖RS(255,239)+BCH(2?040,1?930)级联码. 仿真结果表明,该级联码与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，并在经过3次迭代、误码率为10-12时其净编码增益（NCG）比ITU-T G.975.1中BCH(3?860,3?824)+BCH(2?040,1?930)码和RS(255,239)+CSOC(k0/n0=6/7,J=8) 码要分别大045?dB和048?dB，且比RS(255,239)大281?dB，更适用于光传输系统.

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

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.