利用固有值和固有矢量的方法解出了耦合模方程，并对其进行理论性分析。
We have obtained the coupled-mode equation by using the eigenvalues and eigenvectors, and given a theoretical analysis.
将修正的矢量等效折射率模型和耦合模理论相结合，系统地研究了光子晶体光纤长周期光栅(PCFLPG)的特性。
The properties of long period gratings in photonic crystal fibers (PCFLPG) are systematically analyzed by the improved full-vector effective index model and the coupled mode theory.
采用耦合模理论对倾斜光纤光栅的传播特性进行分析，并推导出模式传播的波动方程、模式间的耦合系数及坡印亭矢量。
The wave equations, modes coupled coefficient and Poynting vector have been got here. The sensing theory of tilted fiber Bragg grating is presented here.
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