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本文基于全矢量有限元法,设计了一种V形结构高双折射光子晶体光纤,数值分析结果表明:当光纤的包层孔间距Λ为1.0μm,包层大空气孔D和小空气孔d分别为0.95μm,0.7μm时,在波长为1.55μm处,该光纤的双折射度B达到1.225×10-2,比传统光纤高约两个数量级.另外,分别在可见光和近红外波段出现了两个零色散波长,使钛宝石飞秒激光器工作波段(700—980nm)处于光纤的反常色散区,为新颖的光子晶体光纤非线性效应研究提供了理论基础;同时,其快轴与慢轴空气填充率的巨大差异也使得这种高双折射光纤对微型传感器件的研制有着重要的应用.
In this paper, a high-birefringence photonic crystal fiber with V-shaped structure is designed based on the full vector finite element method. The numerical results show that when the fiber spacing Λ is 1.0μm, the large air hole D and the small air hole d Respectively is 0.95μm and 0.7μm, the birefringence B of the optical fiber reaches 1.225 × 10-2 at the wavelength of 1.55μm, which is about two orders of magnitude higher than that of the conventional optical fiber. In addition, in the visible and near infrared bands respectively, Two zero-dispersion wavelengths make the working wavelength band (700-980nm) of the sapphire femtosecond laser in the anomalous dispersion region of the fiber, which provides a theoretical basis for the research on the nonlinear effect of the novel photonic crystal fiber. Meanwhile, the fast axis and slow axis air The huge difference in filling rate also makes this kind of high birefringence fiber has important application to the development of micro-sensor device.