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研究了具有高双折射的光子晶体光纤(HB PCF)中均匀布拉格光栅(FBG)的光谱特性。利用紧凑的超格子模型,对光子晶体光纤的传输特性进行分析,研究正向传输和反向传输的模式之间的耦合规律,从而研究写入光子晶体光纤中的均匀布拉格光栅的特性。首先给出具有C6v对称性的零双折射光子晶体光纤中光纤布拉格光栅的布拉格波长λB随光纤结构参量的变化规律;然后分析一种高双折射光子晶体光纤中的光纤布拉格光栅的光谱特性,高双折射使两个不同偏振态的反射峰分开较大;最后分析了一种常用的双模双折射光子晶体光纤中光纤布拉格光栅的光谱特性,LP01模和LPe11模的两个偏振态对应的反射谱都由于高双折射而分开。
The spectral characteristics of a uniform Bragg grating (FBG) in a high birefringence photonic crystal fiber (HB PCF) are investigated. The compact super lattice model is used to analyze the transmission characteristics of photonic crystal fiber. The coupling law between the forward transmission and the backward transmission mode is studied to study the characteristics of uniform Bragg gratings written in photonic crystal fiber. Firstly, the variation of the Bragg wavelength λB with the parameters of the fiber in a zero birefringence photonic crystal fiber with C6v symmetry is given. Then the spectral characteristics of a fiber Bragg grating in a high birefringence photonic crystal fiber are analyzed. The birefringence makes the reflection peaks of two different polarization states separate greatly. Finally, the spectral characteristics of fiber Bragg grating in a commonly used bimodal birefringent photonic crystal fiber are analyzed. The reflection of two polarization states of LP01 mode and LPe11 mode Spectra are separated by high birefringence.