研究结果表明：三阶色散所致啁啾是非线性的，存在极值，极值点在脉冲中心附近，并且与入射高斯脉冲的初始啁啾有关。
The results show that chirp is nonlinear and has extreme value near the center of the pulse and depends on the initial chirp.
数值模拟发现，在脉冲传输距离与扰动周期长度的关系中存在着一种多极值结构。
We numerically show that there are many extremums in dependence of the propagation distance on the period lengths of perturbation.
本文给出一类多元函数—三元函数是否存在极值的快速判别方法，并讨论它在实际问题中的应用。
In this paper, a convenient judgement method about extreme value of one class multivariate functions-trivariate functions was given, and its application in reality was discussed.
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