用分布傅里叶计算硅波导中的非线性薛定谔方程，考虑硅波导中色散及非线性损耗-solution of NLSE(two pulses propagate in silicon waveguide) using split step fourier method

利用Newton-Cotes积分公式求解第二类非线性Volterra积分方程:-Using the Newton- Cotes integration formula for solving nonlinear on the second integral equation:

这是一个求非线性方程一个实根的牛顿法，函数返回标志值。若返回的标志值大于等于0则表示正常返回-This is a nonlinear equation for a real root of the Newton method, function return value signs. If the sign of the return value greater than or equal to 0 that the normal return