分析了一种通过改变包层空气孔径向折射率产生双折射的光子晶体光纤,比较了几何对称性对这种光纤双折射特性的影响.利用有限元法对该光纤基模的电场分布、归一化双折射,偏振等特性进行了数值分析,并且分析了一些参数对双折射的作用.研究结果表明,可以通过调节包层径向孔内介质折射率n,空气孔直径d和包层空气孔间距A的大小,控制光子晶体光纤的双折射特性.当同时改变光纤的几何结构和径向孔内折射率时,双折射效应明显增大,得到了比普通保偏光纤高出一个数量级的结果.这一结果为光子晶体光纤的设计和制造提供了理论依据.
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