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设计了一种具有高对称性模场分布的高双折射光子晶体光纤(PCF)结构,由尺寸相同的椭圆空气孔菱形排列组成。利用全矢量有限元法对该种结构光子晶体光纤的基模场分布、有效模场面积、双折射和色散进行数值分析,所得结果与相同结构参数的圆形空气孔光子晶体光纤进行比较。这两种光纤的模场均具有高对称性,近似圆形,并且易于与光器件中其他光纤耦合。椭圆空气孔光子晶体光纤的双折射可达10-3。
A high birefringence photonic crystal fiber (PCF) structure with high symmetry mode field distribution is designed, which is composed of rhombic arrangement of oval air holes with the same size. The fundamental mode field distribution, effective mode field area, birefringence and dispersion of the photonic crystal fiber with this kind of structure were numerically analyzed by full vector finite element method. The results were compared with that of the circular aperture photonic crystal fiber with the same structural parameters. The mode fields of both fibers are highly symmetrical, nearly circular, and easily coupled with other fibers in the optical device. Ellipse air hole photonic crystal fiber birefringence up to 10-3.