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将长周期光纤光栅简化为三层阶跃折射率波导结构 ,采用弱导标量近似和泄漏模式的概念结合耦合模理论较全面地、定量地分析了环境折射率变化对长周期光纤光栅谐振峰位置和深度等特性的影响 ,获得了一些有益的结论 ,与实验符合得很好
The long-period fiber grating is simplified as a three-layer step-index waveguide structure. The concept of weak-induced scalar approximation and leakage mode is combined with the coupled-mode theory to comprehensively and quantitatively analyze the effect of environmental refractive index change on the resonance peak position Depth and other characteristics of the impact obtained some useful conclusions, in good agreement with the experiment