正方形多芯光子晶体光纤的有限元分析

The finite element analysis of square-lattice multi-core photonic crystal fiber

从Helmholtz方程出发,通过全矢量有限单元法及移位迭代算法,完成了对正方形多芯光子晶体光纤同位相超模的数值模拟分析,详细分析了工作波长、包层空气占空比和两类空气孔直径对五芯光子晶体光纤的同位相超模的影响,结果表明光纤结构是影响纤芯之间模场形态的重要因素,通过优化纤芯间不同类型的空气孔直径,能实现多芯光子晶体光纤同位相超模场的各纤芯等振幅输出.

Based on the Helmholtz equations,the full-vector finite element method accompanied by the shifted iteration algorithm was used to analyze in-phase supermode field of square-lattice multi-core photonic crystal fiber.For a five cores photonic crystal fiber,a detailed analysis of the influences of the wavelength,air duty in cladding and diameters of air holes on in-phase supermode field was carried out.The results show that the form of fiber structure plays a key role on mode shape between fiber cores.At last by optimizing diameters of different air holes between fiber cores,the in-phase supermode shapes which have the same amplitude in each core have been obtained for a multi-core photonic crystal fiber.