通过增加光纤纤芯区域折射率实现了一种高双折射光子晶体光纤.采用全矢量有限元和平面波展开方法,系统地研究了这种高双折射光子晶体光纤在不同的高折射率区域参数(比如区域形状、折射率)情况下的光纤特性.模拟结果表明,光子晶体光纤的双折射可以在优化的参数条件下获得很大提高,光子晶体光纤的非线性系数(连同双折射)也可以同时得到提高. A high birefringence photonic crystal fiber is achieved by increasing the refractive index of the fiber core region. The full birefringence photonic crystal fiber is studied systematically using full vector finite element method and plane wave expansion method in different high refractive index region parameters Such as area shape and refractive index) .The simulation results show that the birefringence of photonic crystal fiber can be greatly improved under the optimized parameters, and the nonlinear coefficient of photonic crystal fiber (along with birefringence) can be simultaneously Be improved.