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设计了一种高双折射低有效模场面积的光子晶体光纤(PCF)。利用有限元法依次研究了三层椭圆孔光子晶体光纤在纤芯中引入矩形排列的四个小椭圆孔,及其基础上再引入一个中心椭圆缺陷孔的五个小椭圆孔情况下的双折射和有效模场面积。研究表明:纤芯区域矩形排列的小椭圆孔主导了光子晶体光纤的双折射,中心椭圆缺陷空气孔中填充高折射率的材料可以获得更高的双折射和更低的有效模场面积,且波长1.55μm处光纤双折射达到了5.49×10-2,x与y偏振有效模场面积分别低至3.05μm2、2.42μm2。
A high-birefringence photonic crystal fiber (PCF) with low effective mode-field area was designed. By using the finite element method, four small elliptical holes with rectangular arrangement of three-layer elliptical hole photonic crystal fiber are studied in turn, and the birefringence of five small elliptical holes with a central elliptical defect hole And effective mode field area. The results show that the small elliptical holes with rectangular arrangement in the core region dominate the birefringence of photonic crystal fiber. The center elliptical defect air hole filled with high refractive index material can obtain higher birefringence and lower effective mode field area The fiber birefringence at wavelength of 1.55μm reached 5.49 × 10-2, and the effective mode field areas of x and y polarization were as low as 3.05μm2 and 2.42μm2, respectively.