啁啾光纤光栅反射谱与时延仿真研究

Study on simulation of reflection spectrum and group delay in chirped fiber grating

为了了解啁啾光纤光栅的特性,基于耦合模方程,利用矩阵分析法对啁啾光纤光栅的反射谱和时延进行了数值模拟,并且分析了不同啁啾系数或不同长度对啁啾光纤光栅反射谱和时延的影响。得出的结果是:啁啾光栅长度一定,随着啁啾系数的增大,其反射谱变宽、时延减小;啁啾系数一定,随着光栅长度的增大,其反射谱变窄、时延增大。

In order to characterize the chirped fiber grating,based on coupled-mode theory, the reflection spectrum and group delay in chirped fiber grating are simulated by using matrix method.The effect of different chirped coefficient or length on reflection spectrum and group delay are analyzed. A conclusion can be drawn that the reflection spectrum is widen and group delay is shortened with the increasing of the chirped coefficient when the length of grating is constant ; the reflection spectrum is narrowed and group delay is lengthened, with the increasing of its length when the chirped coefficient is constant.