保偏负曲率光纤的双折射特性分析  

Analysis on birefringence characteristics of polarization-maintaining negative curvature fiber

作　　者：张正雄 陈吴 佟亮 代问问 刘韶清 郑子其 叶珊珊 王洋洋 蒋文辉 高伟清 ZHANG Zhengxiong;CHEN Wu;TONG Liang;DAI Wenwen;LIU Shaoqing;ZHENG Ziqi;YE Shanshan;WANG Yangyang;JIANG Wenhui;GAO Weiqing(Department of Optical Engineering,School of Electronic Science&Applied Physics,Hefei University of Technology,Hefei 230601,China)

机构地区：[1]合肥工业大学电子科学与应用物理学院光学工程系,安徽合肥230601

出　　处：《量子电子学报》2022年第4期651-661,共11页Chinese Journal of Quantum Electronics

基　　金：国家自然科学基金(61875052,61905059);安徽省自然科学基金(1908085QF273);中央高校科研业务费(PA2019GDQT0007,JZ2020HGTB0065,JZ2020HGQA0163)。

摘　　要：设计了一种具有偏振滤波特性和保偏特性的空芯负曲率光纤(HC-NCF),并对其特性进行了分析。通过引入内包层管破坏常规HC-NCF的对称性,使两个正交方向的基模和内包层玻璃管模式进行耦合,从而增加两个偏振方向的折射率和损耗差异。进而对光纤双折射特性和损耗的影响因素进行分析,包括内包层管的壁厚、内包层管的内直径和纤芯直径。结果表明,当光纤纤芯直径和外包层管环内直径为30μm,外包层和内包层管环壁厚分别为1.116μm和1.56μm,内包层管的内直径为9μm时,在1.55μm波长处双折射达到1.33×10^(−4),基模x偏振和y偏振方向的偏振消光比达到4723(36.7 dB),并且偏振消光比大于100的带宽为7 nm。此外,1.55μm波长处的最低损耗约为0.03 dB/m。这种保偏HC-NCF可应用于对偏振敏感的光纤器件。A kind of hollow-core negative curvature fiber(HC-NCF)with polarization filtering and polarization maintaining characteristics is designed,and its characteristics are analyzed.By introducing an inner cladding ring to break the symmetry of the conventional negative curvature fiber,the fundamental mode and the inner cladding glass mode in two orthogonal directions are coupled,which increases the birefringence and loss ratio in the two polarization directions.Then the influence factors of fiber birefringence characteristics and loss are analyzed,including the wall thickness,the inner diameter of the inner cladding tube,and the core diameter.The results show that when the fiber core diameter and the inner diameter of the outer cladding tube ring are 30μm,the wall thickness of the outer cladding and inner cladding tube ring are 1.116μm and 1.56μm,respectively,and the inner diameter of the inner cladding tube ring is 9μm,the birefringence at 1.55μm reaches 1.33×10^(−4),the polarization extinction ratio in the x polarization and y polarization directions of the fundamental mode reaches 4723(36.7 dB),and the bandwidth with polarization extinction ratio greater than 100 is 7 nm.In addition,the minimum loss at 1.55μm is as low as 0.03 dB/m.It is shown that this kind of polarization maintaining negative curvature fiber can be used in fiber devices that are sensitive to polarization.

关 键 词：物理光学 负曲率光纤 双折射 限制损耗 偏振滤波 

分 类 号：O436[机械工程—光学工程]