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。

And it decreases also with the increase of absolute value of the initial pulse chirp coefficient, but has no relation with the sign of chirping coefficient.

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考虑了光源初始啁啾的作用 ，推导出均方根脉宽的解析表达式 ，分析表明 ：二阶偏振模色散对脉冲展宽的作用与群速度色散及啁啾有关 ，一阶偏振模色散的作用则与这两者无关。

Taken into account both second order dispersion and SPM in the abnormal-dispersion region of single-mode fibers, we obtained the expression of chirp induced by GVD and SPM.

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