初始啁啾对WDM系统中偏振模色散的影响

Impacts of initial chirp on polarization mode dispersion in WDM system

依据耦合非线性薛定谔方程,利用分步傅利叶方法求耦合方程的数值解,仿真分析了初始啁啾对波分复用系统中偏振模色散的影响。仿真结果表明:输入功率较小时,正啁啾与二阶色散共同作用对偏振模色散进行抑制;输入功率较大时,正啁啾与二阶色散、非线性效应共同作用部分补偿了偏振模色散所造成的脉冲展宽;啁啾不宜过大,存在最佳值。

Based on coupled nonlinear Schrodinger equation, the numerical solutionsbtained with Split - step Fourier Method . The impacts that initial chirp affects the polarization mode dispersion in wavelength division multiplex system are simulated and analyzed. The results show that： when the power of the input signal is low, the co- effects positive chirp and second - order dispersion inhibit polarization mode dispersion; while it＇s high, the co- effects positive chirp, second- order dispersion and nonlinear effects compensate pulse＇s expand resulted from polarization mode dispersion partially; the chirps exist optimum values and they shouldn＇t be too large.