包层折射率改变的光子晶体光纤双折射特性分析  

Analysis on birefringence of photonic crystal fiber with changed cladding refractive index

作　　者：何静[1] 郜伟[1] 余仲秋[1] 

机构地区：[1]信息工程大学理学院,河南郑州450001

出　　处：《量子电子学报》2013年第5期594-600,共7页Chinese Journal of Quantum Electronics

摘　　要：分析了一种通过改变包层空气孔径向折射率产生双折射的光子晶体光纤,比较了几何对称性对这种光纤双折射特性的影响。利用有限元法对该光纤基模的电场分布、归一化双折射,偏振等特性进行了数值分析,并且分析了一些参数对双折射的作用。研究结果表明,可以通过调节包层径向孔内介质折射率n,空气孔直径d和包层空气孔间距∧的大小,控制光子晶体光纤的双折射特性。当同时改变光纤的几何结构和径向孔内折射率时,双折射效应明显增大,得到了比普通保偏光纤高出一个数量级的结果。这一结果为光子晶体光纤的设计和制造提供了理论依据。A photonic crystal fiber was analyzed which produces birefringence by changing the refractive index of the cladding radial holes and the influence of geometric symmetry on the birefringence feature of this fiber was compared. The finite element method was used in the data analysis of features such as the electric-field distribution, normalized birefringence and polarization of the fundamental mode of the fiber. The results implied that the birefringence feature of the photonic crystal fiber can be controlled by adjusting the medium refractive index of cladding radial holes, diameter of an air hole and space size between the cladding air holes. If the fiber＇s geometric structure and refractive index of the radial holes are changed at the same time, the birefringence effect will increase with a result of a higher order of magnitude than ordinary polarization-maintaining fiber. This result provides theoretical basis for design and manufacturing of the photonic crystal fiber.

关 键 词：纤维与波导光学 光子晶体光纤 有限元法 双折射 

分 类 号：TN929.11[电子电信—通信与信息系统]