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采用模式耦合理论给出了描述光纤光栅特性的理论模型，分析了布拉格光纤光栅的反射和色散谱特性，并利用数值模拟方法研究了光栅的结构参数优化设计的方案，所得结果可作为这类布拉格光纤光栅结构参数设计的参考依据
Based on the theory of mode coupling, a theoretical model for describing the properties of fiber gratings is presented. The characteristics of the reflection and dispersion spectra of the fiber gratings are analyzed. The numerical simulation is used to study the optimal design of the gratings. The obtained results can be used as the Bragg Reference Design of Fiber Grating Structure Parameters