椭圆形高折射率芯Bragg光纤的偏振和色散特性

应用全矢量有限元方法，分析了椭圆形高折射率芯Bragg光纤的偏振和色散特性，详细讨论了光纤结构参量对模式双折射的影响，结果发现：椭圆形高折射率芯Bragg光纤的模式双折射在10－3量级，比传统保偏光纤高出一个量级，且随波长的增加而单调递增；模式双折射随包层低折射率材料填充比的增加而减小，但与包层周期的变化几乎无关.此外，提高椭圆率或材料间的折射率比可显著增强模式双折射.研究结果有助于设计高性能的一维微结构保偏光纤.

Polarization and Dispersive Properties of Elliptical High-Index-Core Bragg Fibers

In this paper,it is investigated the polarization and the dispersive properties of the elliptical high- index-core Bragg fibers via a powerful full-vector finite element method. The simulation results show that the modal birefringence of the elliptical high-index-core Bragg fibers is on the magnitude of 10-3 , about one order magnitude larger than that of conventional polarization maintaining fibers. The dependence of the modal birefringence on the fiber structural parameters has been fully investigated. The modal birefringence decreases with the filling ratio of the low-refractive-index material and changes little with the variation of the period of the cladding layers. Larger ellipticity or higher index-contrast will result in enhanced modal birefringence. These results will be helpful to the design of high performance one-dimensional microstructured polarization maintaining fibers.