数值分析了光纤截面结构变化对于光栅传输谱的影响，并给出这种影响的定性解释。
The influence of the structure change of the fiber cross section on the transmission spectrum is simulated, and derived qualitatively.
传输谱和弯曲特性测试表明布拉格光纤样品具有两个明显的传输波段，体现了带隙导光的特征。
The measurements of the fiber sample demonstrate its bandgap-guided properties, showing two obvious bandgap guided transmission bands.
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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