椭圆芯类矩形保偏光纤的设计及其双折射特性  

Design and Birefringence Characteristics of Elliptical-Core Pseudo-Rectangle Polarization-Maintaining Fiber

作　　者：朱玉雪 陈东营 赵强 曲轶 Zhu Yuxue;Chen Dongying;Zhao Qiang;Qu Yi(Hainan Key Laboratory of Laser Technology and Optoelectronic Functional Materials,College of Physics and Electronic Engineering,Hainan Normal University,Haikou 571158,Hainan,China;Institute of Oceanographic Instrumentation,Qilu University of Technology(Shandong Academy of Sciences),Qingdao 266061,Shandong,China;Qingdao Marine Science and Technology Center,Qingdao 266237,Shandong,China)

机构地区：[1]海南师范大学物理与电子工程学院海南省激光技术与光电功能材料重点实验室,海南海口571158 [2]齐鲁工业大学(山东省科学院)海洋仪器仪表研究所,山东青岛266061 [3]青岛海洋科技中心,山东青岛266237

出　　处：《光学学报》2023年第20期96-102,共7页Acta Optica Sinica

基　　金：国家自然科学基金(61864002,61933004);山东省自然科学基金面上资助项目(ZR2020MF108,ZR2022QF086);博士后资助项目(QDBSH20230102005);泰山学者工程专项经费资助项目(ts20190951)。

摘　　要：为了进一步提高传统保偏光纤的双折射,设计了一种高双折射椭圆芯类矩形保偏光纤,该光纤具有一个椭圆芯和两个对称的类矩形应力区。采用数值模拟的方法,全面研究了类矩形应力区的尺寸和纤芯的椭圆度对保偏光纤双折射特性的影响。通过优化参数得到椭圆芯类矩形保偏光纤在1550 nm波长下的双折射为8.0794×10^(-4),与传统熊猫型保偏光纤的双折射相比增加了近一倍。此外,还研究了所设计光纤在C通信波段(1530~1565 nm)内双折射与波长变化的关系。该光纤结构简单,具有应用于光纤通信和光纤传感领域的潜力。Objective Birefringence is a key parameter to judge whether polarization-maintaining fiber can maintain polarization state,which has research significance.The birefringence of traditional single-mode fibers is very sensitive to subtle changes in the external environment,and two orthogonal polarization modes in fibers are easy to couple.Generally,polarization-maintaining fibers have strong birefringence,and two orthogonal polarization modes with different propagation constants are not easy to couple.The birefringence caused by external environment changes is far less than that of the fiber itself.Therefore,polarization-maintaining fibers have good polarization-maintaining ability and resistance to external interference,with a wide application prospect in optical fiber sensing,optical components,optical fiber communication,and other fields.We design a high birefringence elliptical-core pseudo-rectangle polarization-maintaining fiber with both shape birefringence and stress birefringence.The shape birefringence depends on the ellipticity of the core,while the stress birefringence depends on the pseudo-rectangle structure in the stress region,which has a simple structural design.The structural parameters are optimized by numerical simulations,and the birefringence of the designed fiber is nearly doubled compared with that of the traditional panda-type polarization-maintaining fiber.The designed high birefringence fiber will be helpful to practical engineering and provide the possibility for the sensing of high birefringence polarization-maintaining fibers.Methods We study the structure design and birefringence characteristics of numerical simulations in elliptical-core pseudo-rectangle polarization-maintaining fibers.Firstly,the birefringence characteristics of the circular-core pseudorectangle polarization-maintaining fiber model are studied and compared with the existing research results to verify the correctness of the proposed polarization-maintaining fiber model.Then,based on the circular-core pseudo-rectangle p

关 键 词：保偏光纤 保偏性能 模式双折射 结构优化 

分 类 号：TN929.11[电子电信—通信与信息系统] TN818[电子电信—信息与通信工程] TN253