保偏光纤内外涂层应力对光纤双折射的影响分析  

Analysis of the Influence of Stress on Fiber Birefringence by Inner and Outer Coatings of Polarization-maintaining Fiber

作　　者：吴庆哲 李萌[1] 徐丹 李绪友 WU Qingzhe;LI Meng;XU Dan;LI Xuyou(Institute of Inertial Navigation and Measurement and Control Technology,College of Intelligent Science and Engineering,Harbin Engineering University,Harbin 150001,China;Jiangsu Fasten Optoelectronic Technology Co.,Ltd.,Wuxi 214000,China)

机构地区：[1]哈尔滨工程大学智能科学与工程学院惯性导航与测控技术研究所,哈尔滨150001 [2]江苏法尔胜光电科技有限公司,无锡214000

出　　处：《光子学报》2024年第6期162-172,共11页Acta Photonica Sinica

基　　金：国家自然科学基金(No.62173106)。

摘　　要：通过研究熊猫型保偏光纤的应力区结构和材料的热膨胀系数、杨氏模量、泊松比,得出了提升保偏光纤双折射的方法。根据内外涂层材料低温特性不同,得出了减小光纤涂层直径能增强光纤双折射的结论。利用COMSOL有限元分析软件建立了光纤环内部受力模型,并分析了光纤涂层材料和不同厚度比例对绕制张力的抑制效果。仿真结果表明,当光纤包层直径和外涂层直径一定时,存在内外涂层最佳厚度比例,较原光纤厚度比例抑制绕制张力效果提升约10%,内外涂层的杨氏模量、泊松比的改变也能有效地减小绕制张力的作用。The Panda-type polarization-maintaining fiber,as a typical stress-type fiber relied on stress birefringence,is utilized for maintaining the polarization state of the transmitted light.An ideal polarization performance is achieved by increasing refractive index difference along two orthogonal axes resulting from stress formed into the fiber core.The Panda-type polarization-maintaining fiber has been widely used in fiber optic gyroscopes,telecommunications,fiber optic sensors,and high-speed optical communication systems owing to its advantages of high polarization extinction ratio,low polarization mode dispersion,and low insertion loss.Currently,improving the birefringence of Panda-type fiber is a significant research direction.Various studies have focused on changing the core shape of the fiber,such as using elliptical,leaf-shaped,and square-shaped cores to enhance birefringence,but with limited effects.An alternative method is to change the shape of stress regions to improve the birefringence of the fiber,such as Knot-type polarization-maintaining fibers and elliptical cladding polarization-maintaining fibers.Remarkably,the Knot-type polarization-maintaining fiber exhibits the best polarization-maintaining performance due to its larger effective stress regions.The most commonly used fiber has a cladding diameter of 80µm to achieve miniaturization of fiber coils.However,for high-precision satellite positioning,unmanned aerial vehicles,and automotive navigation,research on 60µm thin-diameter polarization-maintaining fiber is urgently needed.As the cladding diameter decreases,the study of coating thickness becomes challenging because thinner coating layers are difficult to maintain the excellent transmission performance of the fiber.In this paper,the COMSOL finite element analysis software is utilized to propose a method to enhance the birefringence of Panda-type fiber by adjusting the material properties of the stress regions.By changing thermal expansion coefficients of materials from 2×10-6 K-1 to 7×10-6 K-1,

关 键 词：应力区 双折射 涂层 光纤环 绕制张力 

分 类 号：TN253[电子电信—物理电子学]