窄带通滤波片群时延纹波对 WDM 光通信系统的影响

摘要

We have investigated the effect of narrow ban&pass filter's group delay ripples on the 10 Gbit/s amplitude-shift-keying non-return-to-zero (ASK_NRZ) and differential-phase-shift-keying non-return-to-zero (DPSK_NRZ) wavelength-division-multiplexing (WDM) optical communication systems, which sup-port the huge capacity in the information transmission and display backbone networks. For both ASK and DPSK, there is a peak at a ripple frequency close to the signal data rate in the EOP (eye-opening penalty)vis Frequency of Ripple curve. The EOP of DPSK_NRZ is better than that of ASK_NRZ in the higher rip-pie frequency region. Through numerical simulation, it's found that the ripple amplitude basically deter-mines the system performance. These results will be helpful to design the large-scale transmission systems and define such narrow band-pass filter design parameters.%对应用于支撑大容量信息传输与显示的骨干网 WDM 光通信系统中,窄带通滤波器件的群时延纹波对系统性能的影响进行了初步模拟分析.分别考虑了用于 10 Gbit/s 光通信系统中的 ASK_NRZ 和 DPSK_NRZ 两种调制情况,结果表明在EOP-纹波频率的曲线上,EOP 在纹波频率大致等于信号传输速率的位置出现峰值;在整个纹波频率的高频区,DPSK_NRZ 优于 ASK_NRZ.计算发现纹波的幅度基本决定了对整个系统性能的影响.模拟结果对大容量光通信系统及窄带通滤波器件的参数设计有重要参考价值.