初始啁啾对光纤中传播的飞秒光孤子的影响

采用分步傅里叶变换作为数值模拟的方法，以二阶飞秒光孤子和基态飞秒光孤子为例，讨论了初始啁啾对光纤中传播的飞秒光孤子的时域特征和频谱结构的影响，概括出如下的结论：初始啁啾通过影响飞秒光孤子谱线的红移，而对飞秒光孤子由拉曼效应引发的脉冲延迟产生较大影响，正的初始啁啾使脉冲延迟加剧，负的初始啁啾使脉冲延迟减小。

Effect of initial chirp on femtosecond optical soliton time characters and spectrums has been studied by analyzing second-order and fundamental femtosecond soliton transmission numerically by use of the split-step Fourier method. We show that initial chirp, which can greatly effect the main spectral lines' redshift, consequently, can greatly effect the soliton retardation caused by Raman effect. The femtosecond soliton retardation is strengthened by positive initial chirp but decreased by negative initial chirp.