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为了评估随机变化的偏振模色散(PMD)(包括一阶和二阶PMD)使系统信号裂化的程度,降低其对高速光纤通信系统传输速率和传输容量的不利影响,在斯托克斯空间中推导了偏振模色散(PMD)矢量的数学表达式。对PMD效应所导致的脉冲展宽进行了数学分析,给出了差分群时延(DGD)的变化、一阶PMD矢量和二阶PMD矢量方向的变化对脉冲展宽的影响。通过数学推导得出,在大多数情况下,二阶PMD无法完全补偿,需通过控制单元的调整使其对系统的影响达到极小值。通过实验分析,得到了和数学推导中同样的结果,从而证明了模型的正确性。
In order to assess the extent to which system signals are cracked by randomly varying PMD (including first-order and second-order PMDs) and to reduce their adverse effect on the transmission rate and transmission capacity of high-speed optical fiber communication systems, in Stokes space The mathematical expression of PMD vector is deduced. The pulse broadening caused by PMD effect is analyzed mathematically. The effects of the variation of DGD, the first-order PMD vector and the second-order PMD vector on pulse broadening are given. Through mathematical deduction, it can be concluded that, in most cases, the second-order PMD can not completely compensate and the influence of the control unit must be minimized to the minimum. Through experimental analysis, we get the same result as the mathematical derivation, which proves the correctness of the model.