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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.
Aiming at the application requirements of high birefringence and multi-zero dispersion in optical fiber communication and sensing system, a new type of photonic crystal fiber is designed. The structure is composed of circular air holes arranged in octagonal shape, Two elliptical air holes are added to the symmetrical position of the inner cladding to obtain high birefringence characteristics.The fiber characteristics are analyzed by finite element numerical analysis.The simulation results show that the structure photonic crystal fiber can reach birefringence in the wavelength range of 0.8-2μm 10 ~ (-3) order of magnitude to meet the application requirements of high birefringence, and meet the application requirements of two zero-dispersion points. At the same time, the nonlinear coefficient of fiber reaches 10 ~ (-2) .m ~ (-1) ~ (-1) order of magnitude, which can be applied to the occasions that require higher nonlinearity.