【摘要】 应用全矢量频域有限差分法,分析了所提出的一种高双折射光子晶体光纤的模式截止、损耗、模场半径及数值孔径等特性。数值模拟结果表明,通过设置合适的结构参量,可使这种高双折射光子晶体光纤在保持模式双折射为10-3量级的前提下,能够在600~1800 nm波长范围内保持单模传输,并且限制损耗可低于10-4dB/m量级,同时还可以获得较大的数值孔径,因而聚光能力增强。此外,通过采用高斯曲线拟合基模的模场分布,得到的模场半径与实际模场半径吻合得很好。更多还原

【Abstract】 The mode cutoff,confinement loss,modal radius,and numerical aperture of photonic crystal fiber(PCF) with high birefringence were analyzed by using full-vector finite difference frequency domain(FDFD) method.The numerical simulation results shown that,by choosing suitable structural parameters,the birefringence of the PCF may reach the order of 10-3 with broad single-mode region(600～1800 nm).A low confinement loss less than 10-4 dB/m and high numerical aperture can be obtained in a properly designed geometrical structure of PCF,so the focusing ability is enhanced.Moreover,by fitting the distribution of the fundamental mode using Gaussian curve,the obtained modal radius agrees well with the actual one.更多还原