微结构光纤光栅谐振峰的分析

The Analysis of Microstructure Optical Fiber Bragg Grating Resonant Peaks

利用光束传播法对微结构光纤布拉格光栅谐振特性进行了模拟研究。验证了微结构光纤光栅的多谐振峰结构,并且谐振峰数量取决于内包层直径;定量地研究了微结构光纤光栅掺锗纤芯尺寸对整体反射率、各谐振峰强度和谐振波长漂移的影响,从而为设计光敏微结构光纤提供参考依据;提出当这种光栅产生合适的线性啁啾时,可获得宽带可调谐光谱,三角形微结构光纤光栅啁啾系数等于0.0012时可产生接近15nm的3dB宽带光谱。

The Microstructure Optical Fiber Bragg Grating （MOF-FBG） is simulated using beam propagation method （BPM）. The result validates the multi-peak structure of MOF-FBG, and the dimension of the MOF inner-clad determines the peak number. The influences of germanium core on the total reflection, the resonant peaks intensity and the resonant wavelengths shift are investigated quantitatively. All the results will provide reference for designing the photosensitive MOF. We harp also proposed the broad tunable spectrum can be obtained by making the MOF-FBG generate appropriate linear chirp,e, g. almost 15nm the 3dB broad spectrum canbe attained when the chirp coefficient is 0. 0012 for the triangular MOF-FBG in the paper.