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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 signals in Dense Wavelength Division Multiplexing (DWDM) systems are affected by a variety of nonlinear effects, focusing on the effects of stimulated Raman scattering (SRS), attenuation and noise on communication quality. Based on the fiber transmission equation, the optimal threshold of the receiver is deduced, and the impact of various factors on the bit error rate is analyzed by numerical simulation. The results show that the influence of initial power change on the bit error rate is more sensitive to the change of transmission distance than the original transmission power. After the introduction of system noise, the impact of noise on the system bit error rate exceeds the SRS effect and becomes the main factor affecting the communication quality .