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提出了基于介质分层的光纤光栅新模型．此模型用于计算光纤光栅的波长响应不仅十分简单方便，而且与耦合模理论及实验吻合得相当好．研究了逐段啁啾光纤光栅的接续问题，发现π／２相移对反射谱的重要影响，还获得了其它有价值的新结论．
A new model of fiber grating based on media stratification is proposed. This model is not only very simple and convenient to calculate the wavelength response of FBG, but also fits well with the coupled-mode theory and experiment. The continuation problem of chirp fiber grating with period-by-period was studied. The important influence of π / 2 phase shift on the reflection spectrum was found, and other valuable new conclusions were obtained.