然后对端泵入射光进行建模，研究了纤芯偏心距的优化。
Then, we study the optimization of the offset of the fiber core by simulation of the pumped light.
提出一种基于纤芯失配的光纤倏逝波甲烷传感器。
An optical fiber evanescent wave methane gas sensor based on core diameter mismatch is reported.
光纤光栅是利用光纤材料的光敏性，在纤芯内形成空间相位光栅，它可以改变光波在光导纤维中的传输路径。
Optical fibre grating utilize photosensitive characteristic to form the space phase grating in the core, it can change the transmission route of the light wave in the light-transmitting fibre.
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