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本文描述了偏振模色散（ＰＭＤ）的成因及其统计特性。并针对偏振模色散对模拟和高比特率数字通信系统的影响进行了详细的讨论。光纤和光缆的测量结果表明，为了在光缆中得到合理的光纤偏振模色散值，适当地选取测量状态是很重要的。如果规定允许的偏振模色散最大值为０５ｐｓ／ｋｍ，则可以保证偏振模色散不会对下一代数字通信系统产生影响。西康光纤偏振模色散的典型值仅仅只有上述值的十分之一左右
This article describes the causes of PMD and its statistical properties. The effects of polarization mode dispersion on analog and high bit rate digital communication systems are discussed in detail. The measurement results of the optical fiber and the optical fiber cable show that it is very important to properly select the measurement state in order to obtain a reasonable optical fiber polarization mode dispersion value in the optical fiber cable. If the maximum allowable polarization mode dispersion is 0.5ps / km, it can be guaranteed that polarization mode dispersion will not affect the next generation digital communication system. The typical value of Xikang fiber polarization mode dispersion is only about one tenth of the above value