Two types of high birefringence photonic crystal fiber (PCF) which import four or six big circular air holes near the elliptical-hole are proposed. Their birefringent and dispersive properties are analyzed by full-vector finite-element method (FEM). Numerical analysis demonstrates that importing the big circular hole near the center of elliptical-hole PCFs can achieve a high birefringence. When the ratio (d/LAMBDA) of diameter to hole spacing is larger than 0.8, the proposed two types of PCF have a larger birefringence than that of sole elliptical air hole ones. When the ratio d/LAMBDA is equal to 0.95, the birefringences of these two types PCF can be as high as 4.27 X 10~(-3) and 5.09 X 10~(-3) at the wavelength of 1.55 (mu)m, respectively. Besides, PCF with the four big circular air holes has a large negative dispersion at the long wavelength in x-polarized mode, which indicates a potential in single-polarized mode dispersion compensation.
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机译：提出了两种类型的高双折射光子晶体光纤（PCF），它们在椭圆孔附近引入四个或六个大的圆形气孔。通过全矢量有限元方法（FEM）分析了它们的双折射和色散特性。数值分析表明，在椭圆孔PCF中心附近导入大的圆形孔可以实现较高的双折射。当直径与孔间距的比率（d / LAMBDA）大于0.8时，建议的两种PCF的双折射要比单独的椭圆形气孔的双折射大。当d / LAMBDA之比等于0.95时，这两种类型的PCF在1.55μm的波长下的双折射可以高达4.27 X 10〜（-3）和5.09 X 10〜（-3），分别。此外，具有四个大的圆形气孔的PCF在x偏振模式下在长波长处具有较大的负色散，这表明在单偏振模式色散补偿中具有潜力。
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