中文摘要：

采用全矢量定域基函数模型，以聚合物PMMA为基材，研究了椭圆芯三角点阵扁六角结构光子晶体光纤（Photonic crystal fibers，PCFs）的偏振特性，分析了其相位模双折射和群模双折射与相对孔间隔比的依赖关系，并与椭圆芯三角点阵正六角结构PCFs的研究结论进行比较；研究发现，椭圆芯扁六角结构PCF的偏振特性强烈的依赖于光纤的结构参数，由于色度色散的存在，在短波长段，群双折射远远高于相位模双折射，通过适当调节光纤的相对孔径和相对孔间隔比，有望在给定波长实现高双折射和零偏振模色散单模运行．该研究为高双折射聚合物光子晶体保偏光纤的制备提供了理论依据．

英文摘要：

The polarization properties of elliptical core triangle lattice oblate hexangular structures photonic crystal fibers （PCF） were investigated by full vector localized basis function model based on polymer PMMA. The dependences of relative holes-spacing rate and phase modal birefringence and group birefringence were numerically analyzed, and compared them with those of triangle lattice square hexangular structure. The results show that the polariza- tion properties of elliptical core ablate hexangular structure PCF are strongly dependent on structures parameters of PCF. Due to chromatic dispersion, the group birefringence is larger than phase birefringence. But, by choosing suitable relative hole-diameter or relative hole- spacing rate, it is possible to realize the single mode operating of high birefringence and zero polarization mode dispersion at a given wavelength. This conclusion is useful for preparing high birefringence polymer photonic crystal fibers.