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设计了一种包层结构为圆形空气孔呈正十二边形对称排列的光子晶体光纤,通过Comsol软件结合有限元法,得出各波长与传输模式有效折射率之间的函数关系。结合耦合模理论和传输矩阵法,利用Matlab软件,对正十二边形结构的光子晶体布拉格光纤光栅的反射谱特性进行了研究分析,具体分析了不同占空比下的传输模式以及反射谱特性。研究表明随着光波波长的增加,传输模式的有效折射率随之下降;随着空气孔层数的增加,谐振波长增大,谐振峰强度增强。随着占空比的增大,传输模式数增多,谐振波长减小,而谐振峰强度基本不变。
A photonic crystal fiber whose cladding structure is a symmetrical arrangement of circular ditribular apertures is designed. Comsol software is used in combination with the finite element method to obtain the functional relationship between each wavelength and the effective refractive index of the transmission mode. Based on coupled mode theory and transfer matrix method, the reflection spectral characteristics of a regular dodecagonal photonic crystal Bragg grating using Matlab software are analyzed and analyzed. The transmission modes and the reflection spectrum characteristics under different duty cycles are analyzed in detail. . The results show that as the wavelength of light increases, the effective refractive index of the transmission mode decreases. With the increase of the number of air holes, the resonance wavelength increases and the resonance peak intensity increases. As the duty cycle increases, the number of transmission modes increases, the resonant wavelength decreases, and the resonant peak intensity remains essentially unchanged.