空芯光子带隙光纤结构参数对其有效折射率的影响

Influence of the Structural Parameters of Air-core Photonic Bandgap Crystal Fiber on Effective Index

利用有限元法,从理论和数值上研究了19孔纤芯空芯光子晶体带隙光纤(PBGFs)的结构参数对其有效折射率的影响.采用拓扑优化方法改善纤芯空气孔内层厚度和角度,研究了基本模型的有效折射率与结构参数的关联性.采用完美匹配层(APML)做吸收边界条件,数值结果表明选择边界条件对结果的精度和准确性有很大的影响,有限元法能有效地分析和设计光子晶体光纤,此研究为设计特殊用途的PBGFs提出了一种参考.

This paper uses a finite element method(FEM) method to explore the effective index of air-core photonic bandgap fibers(PBGFs) with 19-cell theoretically and numerically.The topology optimization method is employed to improve the inner glass ring thickness and the corner of the inner glass ring in the PBGFs.The anisotropic perfectly matched layer(APML) is used as an absorbing boundary condition in simulation.Numerical results show that APML is important optimization parameters in FEM,Which will make a great impact on the precision and accuracy of results.It is also shown that the FEM approach can be effectively used in the analysis and design of the PCF with special propagation characteristics.The research presents a reference for designing of PBGFs with specific purpose.