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计算了单级、多级相移光纤光栅在其折射率变化Δn为均匀分布、高斯分布和升余弦分布情况下的反射特性 ,分析了Δn的分布参数、光栅强度、光栅中的直流耦合系数、级联光栅中各级光栅的初相和相移及不同的相位组合对反射谱的影响 ,并分析了它们的应用意义。
The reflection characteristics of single-phase and multi-phase phase-shift fiber gratings under the condition of uniform distribution, Gaussian distribution and raised cosine distribution are calculated. The distribution parameters of Δn, grating intensity, DC coupling coefficient in grating, The effects of initial phase and phase shift and different phase combinations on the reflection spectra of the gratings in cascaded gratings are analyzed and their application significance is analyzed.