基于波长移位的单纤双向系统的传输性能仿真

摘要

This paper sets up a simulation model by using the Optisystem for a DQPSK modulation-based single-fiber bidirec-tional WDM transmission system for performing system capacity expansion,inhibiting the effects of dispersion on the system by step dispersion compensation and reducing the FWM effects by non-uniform channel interval setting and non-uniform disper-sion management.The results indicate that when the transmission distance of an 8-channel 40 Gbit/s WDM transmission sys-tem is 600 km,the Q factor of a single-fiber bidirectional transmission is improved by 14.9 dB to the maximum compared with a single-fiber unidirectional transmission system.Furthermore,when the dispersion and FWM effects are inhibited,the system Q factor can be improved by over 1 1 dB.%利用 Optisystem 仿真软件搭建了基于 DQPSK(差分正交相移键控)编码的 WDM(波分复用)单纤双向传输系统，实现系统传输扩容；同时提出采用分段色散补偿方法抑制色散对系统的影响，利用非均匀信道间隔设置和非均匀色散管理降低四波混频效应。结果表明：在传输距离为600 km、单信道速率为40 Gbit/s 的8信道 WDM 系统中，单纤双向传输时系统的品质因子(Q 值)比单纤单向传输系统最大提高了14.9 dB；对系统进行色散和四波混频抑制后，系统 Q 值还可以提高11 dB 以上。