中文说明：光栅滤波程序，布拉格光栅、啁啾光栅取谱，取样光栅b57058733bragge,delta Neff delta_neff_average tlamda Pg Pe epsrate
English Description：
Grating filter program, Bragg grating, chirped grating spectrum, sampling grating b57058733bragge, delta Neff Delta_ neff_ average tlamda Pg Pe epsrate