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光纤通信线路检测到的电功率随差分群延迟变化,可以作为PMD补偿的反馈控制信号.给出了这一变化关系的理论计算和曲线并通过实验验证这一关系,确定电压信号与DGD的变化关系.建立了一套完整的实验系统,并考虑了影响反馈电压信号的多种因素以及减小这些影响的措施.眼图给出的实验结果说明了补偿的效果,还利用误码测试仪测量了补偿前后的接收灵敏度的改变以定量说明补偿的效果,最后比较了不同情况下的补偿结果.
The detected electric power of optical fiber communication line changes with the differential group delay, which can be used as the feedback control signal of PMD compensation. The theoretical calculation and curve of this relationship are given and the relationship between voltage signal and DGD is confirmed through experiments A complete set of experimental system was established and considered various factors affecting the feedback voltage signal and measures to reduce these effects.The experimental results given in the eye diagram showed the effect of compensation and the error tester was also used to measure The change of receiving sensitivity before and after compensation can quantitatively explain the effect of compensation. Finally, the compensation results under different conditions are compared.