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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10Gbit/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。
The influence of the group delay ripple of the narrow band-pass filter on the system performance is analyzed preliminarily for the WDM optical communication system supporting backbone transmission and display of large-capacity information. The modulations of ASK_NRZ and DPSK_NRZ used in 10Gbit / s optical communication system are considered respectively. The results show that the peak of EOP appears at the ripple frequency approximately equal to the signal transmission rate on the EOP-ripple frequency curve. High frequency region of ripple frequency, DPSK_ NRZ is better than ASK_NRZ. The magnitude of the ripple found in the calculation basically determines the effect on the overall system performance. The simulation results have important reference value for the parameter design of large-capacity optical communication system and narrow-band pass filter.