以matlab代码的仿真M-FILE，使用转变矩阵法来评估光波导中的模式耦合方程以及光栅的反射谱分散的法布里-珀罗滤波器模拟-Perot filter simulation- simulation with matlab code M-FILE, to assess the reflection spectrum of mode coupling waveguide grating dispersion equations and the transformation matrix method