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光纤通信系统的偏振模色散(PMD)是限制系统传输容量和距离的关键因素。系统输出信号的偏振度(DOP)反映了系统的偏振模色散。利用光纤通信系统的Jones矩阵模型,在理论上得到了系统的输出光脉冲Stokes矢量的表达式。在此基础上分析和计算了系统的输出脉冲的偏振度特性。结果表明,系统的输出信号的偏振度随入射脉冲偏振态的变化而变化,当入射脉冲偏振态与系统的主偏振态一致时,系统的输出信号的偏振度达到极大;同时,随着系统的偏振模色散幅度的增大而变小。系统的输出信号的偏振度还随着信号原始啁啾系数绝对值的增大而减小,但与啁啾系数的符号无关。
Polarization mode dispersion (PMD) in optical fiber communication systems is a key factor that limits the system’s transmission capacity and distance. The degree of polarization (DOP) of the system output signal reflects the polarization mode dispersion of the system. By using the Jones matrix model of optical fiber communication system, the expression of the Stokes vector of the output light pulse of the system is obtained theoretically. On this basis, the polarization characteristics of the system output pulse are analyzed and calculated. The results show that the polarization degree of the output signal of the system changes with the polarization state of the incident pulse. When the polarization state of the incident pulse coincides with the main polarization state of the system, the polarization degree of the output signal of the system reaches a maximum. At the same time, The polarization mode dispersion width increases and becomes smaller. The degree of polarization of the output signal of the system also decreases as the absolute value of the original chirp coefficient of the signal increases, but it is independent of the sign of the chirp coefficient.