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偏振模色散是高速光纤通信系统的主要问题之一。在用偏振度作为反馈信号的动态偏振模色散补偿系统中 ,偏振度与差分群延时的关系对于准确快速的动态偏振模色散补偿很重要。推导出了准单色光波情况下任意波形和高斯脉冲的偏振度的数学表达式 ,理论分析了高斯脉冲情况下分光比、脉冲宽度和连续脉冲个数分别对偏振度与差分群延时关系的影响 ,并用 10Gbit/s归零 /不归零伪随机码序列进行了实验 ,实验证明了理论推导和理论分析的正确性。实验还表明偏振度的大小与脉冲啁啾和光纤色散无关 ,从而肯定了将实际光脉冲化简为准单色光波分析的可行性。
Polarization mode dispersion is one of the major problems in high-speed optical fiber communication systems. In the system of dynamic polarization mode dispersion compensation with polarization as the feedback signal, the relationship between polarization degree and differential group delay is very important for accurate and fast dynamic polarization mode dispersion compensation. The mathematical expressions of the degree of polarization of arbitrary waveform and Gaussian pulse in the case of quasi-monochromatic light wave are deduced. The relationship between the polarization degree and the delay of the differential group is theoretically analyzed for the splitting ratio, pulse width and number of continuous pulses respectively under Gaussian pulse The experiments were carried out with 10Gbit / s zero / non-return-to-zero pseudorandom code sequence. The experiment proves the correctness of theoretical derivation and theoretical analysis. Experiments also show that the degree of polarization has nothing to do with the pulse chirp and fiber dispersion, which affirms the feasibility of reducing the actual optical pulse to quasi-monochromatic light wave analysis.