一阶与二阶PMD矢量统计依赖特性研究

Statistical Dependence Properties Existed between the First and Second-Order PMD Vector

采用短光纤级联模型,对一阶和二阶偏振模色散(PMD)矢量的统计依赖特性进行了仿真研究.仿真结果表明,光纤PMD值越大,偏振有关色度色散、去偏振项、偏振主态(PSP)旋转速率和二阶PMD的覆盖范围也越大.对于特定的PMD值,随着差分群时延值的增加,平均偏振有关色度色散保持不变,平均PSP旋转速率迅速减小,而平均去偏振项和二阶PMD线性增大.在二阶PMD中,去偏振项占主导地位,偏振有关色度色散只有很小的贡献.

With the aid of modeling a long optical fiber with 1 000 cascaded small fiber segments, the statistical dependence existed between the first-and the second-order polarization mode dispersion (PMD) vector was numerically simulated. The simulated result shows that: the higher the PMD value of an optical fiber is, the larger range the covering of the polarization-dependent chromatic dispersion (PCD), the principal state of polarization (PSP) rotation rate, and the depolarization become. For a specified PMD value, with the increasing of differential group delay, the averaged PCD keeps constant; the averaged depolarization and second-order PMD will be increased linearly; but the averaged PSP rotation rate will be decreased rapidly. It is also shown that the depolarization will play a role of domination in the second-order PMD, and PCD will only have a little contribution.