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利用有限元法对一种柚子型光子晶体光纤中的传输模式进行了模拟,得到了各传输模式的有效折射率和模场分布。结合耦合模理论和相关函数方法,对柚子型光子晶体光纤布拉格光栅反射谱进行了理论分析,解释了柚子型光纤光栅出现多个谐振峰的原因;数值分析了光纤纤芯直径和空气孔尺寸对光栅传输谱的影响。结果表明谐振峰波长随纤芯直径的增大向长波方向漂移,而随空气孔增大向短波方向移动,并且不同谐振模式的变化幅度不同;利用相位模板法写制了光子晶体光纤光栅,实验结果与理论分析能够很好地吻合。
The transmission modes in a grapefruit-type photonic crystal fiber are simulated by finite element method, and the effective refractive index and mode field distribution of each transmission mode are obtained. Based on the coupled-mode theory and the correlation function method, the reflection spectra of grapefruit-type photonic crystal fiber Bragg grating are analyzed theoretically, and the reasons for the occurrence of multiple resonance peaks of grapefruit fiber grating are explained. The fiber core diameter and pore size are analyzed numerically Effect of grating transmission spectrum. The results show that the resonance peak wavelength drifts toward the long wave with the increase of the core diameter and moves toward the short wave with the increase of the air hole, and the amplitude of the resonant modes changes with different amplitude. The photonic crystal fiber grating is written by the phase plate method, The results are in good agreement with the theoretical analysis.