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提出了一种高双折射多孔光纤几何结构,其包层气孔呈圆形晶格阵列。应用有限差分波束传播法对其双折射特性进行了数值模拟,分析了截面结构参数对双折射特性的影响,比较了圆形、四边形和八边形晶格阵列产生的双折射。研究结果表明,这种圆形晶格多孔光纤的模式双折射在1.7～2.0μm波长范围内可达到10-2量级;在截面结构参数相同的情况下,圆形晶格多孔光纤比四边形和八边形晶格多孔光纤具有更高的双折射,其偏振拍长值在0.6～2.0μm波长范围内都处于亚毫米量级。这种光纤适合于制作光纤偏振器件或偏振干涉型光纤传感器。
A high birefringence porous optical fiber geometry is proposed, in which the cladding pores are in a circular lattice array. The finite difference beam propagation method is used to simulate the birefringence characteristics of the birefringence beam. The influence of the cross-sectional structure parameters on the birefringence properties is analyzed. The birefringence generated by the circular, quadrilateral and octagonal lattice arrays is compared. The results show that the mode birefringence of the circular lattice porous optical fiber can reach 10-2 in the wavelength range of 1.7 ~ 2.0μm. In the case of the same cross-sectional structure parameters, the circular lattice porous optical fiber is more effective than the quadrilateral and The octagonal lattice porous optical fiber has a higher birefringence, and its polarization beat length is on the order of submillimeter in the wavelength range of 0.6-2.0 μm. This kind of optical fiber is suitable for making optical fiber polarization device or polarization interference optical fiber sensor.