4μm单模单偏振硫系负曲率反谐振光纤  

Single-Mode Single-Polarization Chalcogenide Negative-Curvature Hollow-Core Fibers at 4μm

作　　者：马欣欣 李建设[1] 郭海涛[2] 李曙光[1] 许彦涛[2] 张豪 孟潇剑 郭英 王莼 武彪 赵原源[1] 崔兴旺 Ma Xinxin;Li Jianshe;Guo Haitao;Li Shuguang;Xu Yantao;Zhang Hao;Meng Xiaojian;Guo Ying;Wang Chun;Wu Biao;Zhao Yuanyuan;Cui Xingwang(State Key Laboratory of Metastable Materials Science and Technology,Key Laboratory for Microstructural Material Physics of Hebei Province,School of Science,Yanshan University,Qinhuangdao 066004,Hebei,China;State Key Laboratory of Transient Optics and Photonics,Xi'an Institute of Optics and Precision Mechanics,Chinese Academy of Sciences,Xi'an 710119,Shaanxi,China)

机构地区：[1]燕山大学理学院,亚稳材料制备技术与科学国家重点实验室,河北省微结构材料物理重点实验室,河北秦皇岛066004 [2]中国科学院西安光学精密机械研究所,瞬态光学与光子技术国家重点实验室,陕西西安710119

出　　处：《光学学报》2023年第19期66-75,共10页Acta Optica Sinica

基　　金：国家重点研发计划(2019YFB2204001);国家自然科学基金(12074331);河北省自然科学基金(F2020203050);中国科学院西安光学精密机械研究所瞬态光学与光子技术国家重点实验室研究基金(SKLST201908)。

摘　　要：提出并研究了一种以硫系玻璃为基底材料的红外负曲率反谐振光纤,该光纤在4μm附近可低损耗、单模单偏振传输光信号。利用有限元法对其性能进行数值仿真,结果表明:该光纤在3.99~4.00μm波长范围内具有良好的单模单偏振特性,特别是在4μm波长处,偏振消光比和高阶模式消光比分别达到491和649,表明其保偏性能具有很好的稳定性;该光纤具有低损耗传输特性,在3.92~4.01μm波长范围内,x偏振基模均可维持在平坦且损耗很低的反谐振区域内,尤其在4μm波长处,x偏振基模的损耗仅为1.8×10^(-4)dB/m;该光纤具有良好的抗弯曲能力,在单模单偏振传输下,弯曲损耗始终小于10^(-3)dB/m。该红外负曲率反谐振光纤不仅在中红外波段的通信和医疗系领域具有良好的应用前景,也为工作在4μm波段的量子级联探测器提供了纯净光源。Objective As one of the important properties of the light field,polarization plays an important role in the interaction between light and matter.The modulation of polarization plays an indispensable role in optical communication systems,fiber sensors,fiber lasers,and other fields.However,in view of the twist,defects,environment perturbations,and other factors in the process of optical fiber manufacturing,the manufactured optical fiber is not completely uniform,which introduces random birefringence and leads to unpredictable polarization states.Therefore,it is of great practical value to study optical fibers with excellent polarization states.Although the existing single-polarization single-mode negativecurvature hollow-core fiber has the advantages of simple structure,easy preparation,endless single-mode transmission,and low loss,due to the limitation of research habits and optical materials,the current research mainly focuses on common communication bands.But obviously,the mid-infrared band will become the next hot band of the negative-curvature hollow-core fiber.Research shows that a wavelength of 3-5μm plays an important role in national defense,medical care,communications,and other fields,especially near the wavelength of 4μm,which is an ideal band for quantum cascade detectors to detect low-level light.Single-mode single-polarization light helps to provide a more pure light source for quantum cascade detectors.Therefore,it is of great practical significance to study the single-mode single-polarization negative-curvature hollow-core fiber with a wavelength of 4μm.Methods A hollow-core anti-resonant fiber composed of six nested tubes working near 4μm is designed,which can transmit single-mode single-polarization with low loss.The influence of structural parameters on fiber performance is calculated by using the control variable method.The capillary wall thickness will lead to an obvious change in the fiber loss with the working band,which is the key factor affecting the characteristics of the negative-curv

关 键 词：光纤光学 负曲率空芯光纤 空芯反谐振光纤 单模 单偏振 有限元法 

分 类 号：O436[机械工程—光学工程]