新型改进光双二进制传输的编解码方案

Novel coding and decoding scheme for modified optical duobinary signal transmission

提出了改进型光双二进制信号在高速率(≥10Gbit/s)传输时预编码的一种新方案。通过分析编解码过程,证明该信号传输时不易受码间干扰影响,能用二进制强度调制—直接检测的系统接收信号。仿真产生了该信号的2种码型。结果表明,采用色散补偿技术能使MD-NRZ和MD-RZ信号在长距离传输后克服眼图失真,MD-RZ信号比MD-NRZ信号在传输后有更低的误码率。

A novel pre-coding scheme for modified optical duobinary signals was proposed. It could he applied to transmit high speed data rate signals （≥10Gbit/s）. Through analyzing the process of coding and decoding, It was demonstrafed that modified optical duobinary signals have capability in reduction of pulse-to-pulse interaction, and could he directly measured through a conventional binary intensity modulation direct detection （IM-DD） receiver. Two modified optical duobinary signals＇ formats were simulated to generate. Simulation results show that MD-NRZ and MD-RZ signals＇ formats can avoid the eye diagrams＇ distortion for long-distance transmission, if the dispersion can he compensated in each amplifier span. Moreover, the MD-RZ signal has lower BER than the MD-NRZ signal after long-distance communication.