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利用矩阵分析法,针对两个相同光栅构成的光纤布拉格光栅法布里-珀罗(F-P)腔滤波器进行理论分析。数值模拟分析了光栅长度变化对光栅以及F-P腔滤波器反射特性的影响,指出光栅长度增加对反射特性影响的优缺点,分析利用常用切趾函数对光栅进行切趾,减小由于光栅长度增加导致反射谱的的旁瓣增大,对组成的F-P腔滤波器的反射特性的优化,得到了光栅切趾对F-P腔滤波器的反射特性的影响规律。对于在实际应用中制作出性能优良的光纤布拉格光栅F-P腔滤波器有一定的参考价值。
Using the matrix analysis method, the theoretical analysis of two fiber Bragg grating Fabry-Perot (F-P) cavity filters with the same grating is carried out. The influence of grating length variation on the reflection characteristics of the grating and FP cavity filter is analyzed numerically. The advantages and disadvantages of the influence of the grating length on the reflection characteristic are pointed out. The apodization of the grating is carried out by using the common apodization function, which is reduced due to the increase of grating length The sidelobe of the reflection spectrum increases, and the influence of the grating apodization on the reflection characteristic of the FP cavity filter is obtained by optimizing the reflection characteristics of the FP cavity filter. For the practical application of fiber Bragg grating F-P cavity filter with good performance have some reference value.