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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 resonant properties of microstructured fiber Bragg gratings are studied by using the beam propagation method. The multi-resonant peak structure of the microstructured FBG was verified and the number of resonance peaks was dependent on the inner cladding diameter. The influence of the germanium-doped fiber core size on the overall reflectivity, the resonant peak intensity and the resonant wavelength shift was studied quantitatively , So as to provide a reference for the design of photosensitive microstructured optical fiber. It is proposed that when the grating produces a suitable linear chirp, a broadband tunable spectrum can be obtained. When the chirp coefficient of a triangular microstructured optical fiber grating is equal to 0.0012, a 3dB broad band spectrum.