中文说明：使用基于分步傅里叶方法的计算光纤中非线性效应，如交叉相位调制和多阶色散等因素对在光纤中传播的多个光场的幅度和频率的影响情况
English Description：
Based on the split step Fourier method, the influence of nonlinear effects such as cross phase modulation and multi-order dispersion on the amplitude and frequency of multiple optical fields propagating in the fiber is calculated