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本文研究了纤芯结构对空芯光子晶体光纤光子带隙和传输损耗的影响,得到了适合光纤制备工艺的纤芯结构.首先利用平面波展开法计算了一定占空比三角形结构的空芯光子晶体光纤的带隙结构,给出了在传输波长λ=1.55μm时光纤的结构参数值,并模拟了纤芯直径对带隙位置和大小的影响,得出纤芯直径的取值范围,通过分析泄露损耗特性得出纤芯壁厚的取值.然后根据分析结果设计出了光纤端面图,运用全矢量有限元法模拟出在不同纤芯直径的情况下的模场分布,通过对比分析得出光纤的最佳纤芯半径R为1.6Λ—1.75Λ.研究结果表明,选择合适的纤芯结构既能满足空芯光子晶体光纤的光子带隙和损耗特征,又可以适当降低光纤制备工艺的难度.
In this paper, the effect of core structure on the photonic bandgap and transmission loss of hollow-core photonic crystal fiber is studied, and the fiber core structure suitable for optical fiber fabrication process is obtained.Firstly, the hollow-core photonic crystal with a certain duty cycle triangular structure is calculated by the plane wave expansion method The bandgap structure of the fiber is given, and the structural parameter values of the fiber at the transmission wavelength λ = 1.55μm are given. The influence of the core diameter on the position and size of the bandgap is simulated, and the range of the core diameter is obtained. Leakage loss characteristics of the core wall thickness values obtained.According to the analysis results of the design of the fiber end-face map, the use of full-vector finite element method to simulate the different core diameter in the case of mode field distribution obtained by comparative analysis The optimal core radius R of the optical fiber is 1.6Λ-1.75Λ. The results show that the suitable core structure can meet the photonic bandgap and loss characteristics of hollow-core photonic crystal fiber and reduce the difficulty of fiber preparation process .