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设计了一种基于双折射效应的新型矩形纤芯光子晶体光纤偏振分束器,通过在矩形晶格结构的光子晶体光纤的每个纤芯中引入一对椭圆来增加结构的双折射。应用全矢量有限元法(FEM)分析了双芯光子晶体光纤中结构参数对双折射和耦合长度特性的影响,数值模拟了该偏振分束器的性能。结果表明:增大椭圆率可以在增大结构的双折射的同时减小耦合长度,并且该分束器在工作波长为1.55μm、传输长度为282μm的光纤中能够实现偏振状态的隔离,消光比达到最小值-45.42dB,并且在1.507~1.596μm、带宽为89nm的范围内消光比小于-10dB。
A new type of rectangular-core PCF polarization beam splitter based on birefringence effect is designed to increase the birefringence of the structure by introducing a pair of ellipses into each core of a photonic crystal fiber with rectangular lattice structure. The influence of the structural parameters on the birefringence and coupling length characteristics in a two-core photonic crystal fiber is analyzed by the full-vector finite element method (FEM), and the performance of the polarization beam splitter is numerically simulated. The results show that increasing the ellipticity can reduce the coupling length while increasing the birefringence of the structure, and the beamsplitter can achieve the polarization state isolation in the optical fiber with the working wavelength of 1.55 μm and the transmission length of 282 μm. The extinction ratio Reached the minimum value of -45.42 dB, and the extinction ratio was less than -10 dB in the range of 1.507 to 1.596 μm and the bandwidth of 89 nm.