噪声和SRS效应对DWDM系统误码率的影响分析

Analysis of the BER with noise and SRS effects on DWDM system

密集波分复用(DWDM)系统中信号受多种非线性效应的影响,重点分析了受激拉曼散射(SRS)、衰减与噪声对通信质量的影响。以光纤传输方程为基础,推导接收机的最佳判决门限,结合数值仿真分析各因素对误码率的影响。结果显示相对于传输距离变化对误码率的影响,初始功率变化对其的影响更为敏感,引入系统噪声后,噪声对系统误码率的影响超过了SRS效应,成为影响通信质量的主要因素。

The signal transferring in the DWDM system is affected by SRS effect and attenuation, and the receiving signal and noise will simultaneously affect the communication result. In this paper, based on the computer model,the influence of various factors on BER was analyzed with theoretical derivation and numerical simulation for three cases. The results show that only attenuation has little influence on BER, while under the condition of both SRS and attenuation, the BER increases rapidly as the rise of the initial power. Furthermore, when simultaneously considering noise, attenuation and SRS effect, the BER will be greatly affected.