分步傅里叶算法求解非线性薛定谔方程，非常有用的方法，目前被广泛应用,sst solve the NLS equation .it s the very useful numercial method~!

This M-File solves Nonlinear schrodinger equation and display the results in 3d graphics along with it the Pulse broadening ratio and phase shift has also been calculated and displayed.