异质螺旋包层大模场光纤模式传输特性研究  

Mode Transmission Characteristics of Heterogeneous Helical Cladding Large Mode Area Fiber

作　　者：沈骁[1] 李婴婴 杨涛 郑加金[1] 张祖兴[1] 韦玮[1] Shen Xiao;Li Yingying;Yang Tao;Zheng Jiajin;Zhang Zuxing;Wei Wei(College of Electronic and Optical Engineering&College of Flexible Electronics(Future Technology),Nanjing University of Posts and Telecommunications,Nanjing 210023,Jiangsu,China;College of Materials Science&Engineering,Nanjing University of Posts and Telecommunications,Nanjing 210023,Jiangsu,China)

机构地区：[1]南京邮电大学电子与光学工程学院、柔性电子(未来技术)学院,江苏南京210023 [2]南京邮电大学材料科学与工程学院,江苏南京210023

出　　处：《光学学报》2022年第20期42-48,共7页Acta Optica Sinica

基　　金：国家自然科学基金面上项目(62075099,62074082);企业横向课题(2021外305,2021外398)。

摘　　要：提出了一种面向2.0μm的新型异质螺旋包层结构的大模场单模光纤,基于坐标变换理论,采用有限元仿真技术,建立了三维螺旋光纤的二维仿真模型,分析了光纤的模式传输特性,得到了优化的光纤参数,使得基模传输损耗小于0.1 dB/m,高阶模传输损耗大于10.0 dB/m,单模芯径达66μm,模场面积约为2360μm^(2)。当光纤弯曲时,螺旋狭缝宽度值减小到9μm附近。螺距增加到26 mm、光纤弯曲半径最小为33 cm时,基模传输损耗为0.10 dB/m,高阶模传输损耗大于10.08 dB/m。所提出的螺旋结构大模场光纤的螺距较长,属于全固态结构,参数之间可相互协调,有利于光纤的制备和使用,模式分辨本领达到大模场单模光纤相关要求,有望在高功率光纤激光器中获得良好的应用。A novel type of large mode area single mode fiber with heterogeneous helical cladding is proposed for 2.0μm.Based on the coordinate transformation theory and the finite element simulation technology,a two-dimensional simulation model for a three-dimensional helical fiber is established,the mode transmission characteristics of the fiber are analyzed,and the expected conclusions and optimized optical fiber parameters are obtained.The transmission loss of the fundamental mode is less than 0.1 dB/m,the transmission loss of high-order mode is more than 10.0 dB/m,the largest single-mode core diameter is up to 66μm,and the mode field area is about 2360μm^(2).When the fiber is bent,the helical slit width is reduced to about 9μm.When the helix pitchΛis increased to 26 mm and the minimum bending radius is 33 cm,the transmission loss of fundamental mode is 0.10 dB/m,and the transmission loss of high-order mode is greater than10.08 dB/m.The proposed fiber has a long helix pitch and all-solid-state structure,parameters can be coordinated with each other,so it is conducive to preparation and use of optical fibers.The mode discrimination ability meets the requirements of large mode area single mode fiber.It is expected to be well applied in high power fiber lasers.

关 键 词：光纤光学 大模场光纤 模式传输特性 弯曲损耗特性 

分 类 号：TN252[电子电信—物理电子学]