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针对空芯光子带隙光纤内部结构提出了一种准确的建模方法,使用全矢量有限元法研究了纤芯结构变化对光纤散射损耗的影响,对不同纤芯壁厚度以及不同纤芯半径的空芯光子带隙光纤进行了仿真计算,并以归一化分界面场强表征散射损耗的大小。计算结果表明,纤芯壁相对厚度Tc≈4时,散射损耗可以得到较大的降低,同时散射损耗也会随着纤芯半径的增大而减小。通过对纤芯结构进行优化,理论上在1.5~1.56μm波段范围内散射损耗可比现有光纤减小50%。
Aiming at the internal structure of hollow photonic band gap fiber, an accurate modeling method is proposed. The influence of the change of fiber structure on the fiber scattering loss is studied by the full vector finite element method. The influences of different core wall thickness and different core radius Hollow photonic bandgap fibers are simulated and the scattering loss is characterized by the normalized interfacial field strength. The calculation results show that the scattering loss can be greatly reduced when the relative thickness of the core wall is Tc≈4, and the scattering loss decreases with the increasing of the core radius. By optimizing the core structure, theoretically the scattering loss in the 1.5-1.56μm band can be reduced by 50% compared to the existing fiber.