应用耦合模理论和传输矩阵法计算模拟了长周期光纤光栅的透射谱，并对其进行了切趾优化。

Based on the coupled-mode theory, the transfer-matrix method is used to calculate the transmission spectra of phase-shifted long-period fiber gratings (LPFG).

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还简单讨论了所观察到的界面模及其与限制模的组合谱。

A brief discussion on interface modes and their combination with confined modes are also presented.

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对长周期光纤光栅传输谱谐振波长的应变特性用耦合模理论进行研究，推导出谐振波长应变灵敏度的解析表达式。

The strain sensitivity characteristic of long-period fibre grating (LPFG) was studied by coupled-mode theory and the strain sensitivity analytic equation of the resonant wavelength was deduced.

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