电场作用下热极化四孔光纤偏振光传输特性研究

Study of polarized light transmission characteristics for thermally poled four-hole fiber under the electric field

由于热极化将破坏光纤熔石英材料的中心反演对称性,使其产生二阶光学非线性效应或线性电光效应。设计一种四孔光纤,采用载流子模型,通过有限元计算方法,分析四孔光纤的热极化过程,制备出了热极化四孔光纤,并研究了电场对其偏振光传输特性的影响。实验测量结果表明:热极化四孔光纤中,偏振光的椭圆率和方位角随电场强度的变化呈近似线性关系。由此获得其二阶非线性系数为0.17pm/V,与数值仿真结果基本一致。

Because thermal polarization will destroy the central inversion symmetry of fused silica,it will produce second-order optical nonlinearity effect or linear electro-optic effect.Studies have shown that thermal poling of fused silica fibers can destroy this macroscopic central symmetry,resulting in second-order nonlinearity or linear electro-optical effects.In this paper,a four-hole optical fiber is designed.A carrier model is used to simulate the thermal poling process of four-hole fiber by finite element analysis.Based on this,a thermally poled four-hole fiber was prepared and its polarized light transmission characteristics was studied the under influence of the electric field.The experimental results show that the ellipticity and azimuth of polarized light in the thermally poled four-hole fiber change linearly with the electric field strength.Thus,its second-order nonlinearity is 0.17 pm/V,which is basically consistent with the numerical simulation results.