几种折射率深度调制函数的线性啁啾光栅特性分析

Based on the coupled-mode equations, the reflection spectrum and group delay of the linear chirped fiber grating of different refractive index depth modulation are simulated by using matrix analysis method.With different refractive depth distribution as the starting point. To begin with the refractive index distribution , the relations between the refractive index depth of linear、sine、high order modulation function and their parameters such as band width , reflective index are discussed , offering references for the designing system. The conclusion is that with the increase of linear coefficient, the maximum delay up,the peak reflectivity down; With the decrease of the period of sine modulation,the maximum delay cyclical change,the reflectivity and bandwidth basically unchanged; The delay of odd order and even order refractive index modulation function has a big difference when modulation function of the refractive index depth is high order function ,the peak reflectivity of odd order refractive index modulation function is higher than even order.