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中文摘要：
针对光纤通信和传感系统中高双折射、多零色散点的应用需求,设计了一种新型结构的光子晶体光纤.该结构包层为圆形空气孔按照八边形形状排列而成,并在内包层对称位置中加入两个椭圆空气孔以获得高双折射特性.通过有限元数值分析方法对光纤特性进行分析,仿真结果表明,该结构光子晶体光纤在波长0.8—2μm范围内双折射可达10~（-3）量级,满足高双折射的应用需求,并且满足两个零色散点的应用需求.同时光纤的非线性系数达10~（-2）.m~（-1）.W~（-1）量级,可应用于对非线性要求较高的场合.
英文摘要：
Aiming to the requirements of high birefringence and multiple zero dispersion points of optic-fiber sensing and communication systems,a new type of photonic crystal fiber（PCF） is proposed.The cladding is arrayed by octagonal air holes,and two big elliptical air holes are added in inner cladding to increase the birefringence.Numeral results show that this type of PCF exhibits high birefringence with a level of 10~（-3） when wavelength ranges from 0.8-2μm,which fulfils the requirement of high birefringence,and two zero dispersion points are obtained after optimization.In addition,high nonlinear coefficient with a level of 10~（-2） m~（-1·）W~（-1） is obtained, which could be used in the case where the nonlinearity is highly required.
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