ssprop3.0.1版本，适合与matlab6.5以上版本对接包括常用的实例和matlab函数

光脉冲经过一段光纤后的表达式 This function solves the nonlinear Schrodinger equation for pulse propagation in an optical fiber using the split-step Fourier method. The following effects are included in the model: group velocity dispersion (GVD), higher order dispersion, loss, and self-phase modulation (gamma).