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.

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。

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Starting with waveguide ray theory, the condition for single-mode waveguide is derived, and design of single-mode strip waveguide is accomplished with effective index method.

从导波的射线理论出发，导出了波导单模条件，运用有效折射率法完成了单模波导的优化设计。

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The effective index refractive of every mode is 2.0044, 1.7098, measured by prism coupler method.

利用棱镜耦合法测得了该薄膜中每条模所对应的有效折射率为2.0044和1.7098。

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