新型太赫兹光子晶体OAM光纤设计  

Design of new terahertz photonic crystal fiber for Orbital Angular Momentum modes transmission

作　　者：杨婧翾 李巍 成利敏 YANG Jingxuan;LI Wei;CHENG Limin(School of Electrical Information Engineering,Langfang Normal University,Langfang Hebei 065000,China;School of Electronic and Control Engineering,North China Institute of Aerospace Engineering,Langfang Hebei 065000,China)

机构地区：[1]廊坊师范学院电子信息工程学院,河北廊坊065000 [2]北华航天工业学院电子与控制工程学院,河北廊坊065000

出　　处：《太赫兹科学与电子信息学报》2023年第12期1417-1422,1446,共7页Journal of Terahertz Science and Electronic Information Technology

基　　金：廊坊师范学院教改资助项目(K2022-21);河北省自然科学基金资助项目(F2021408002);河北省高等学校科学技术研究资助项目(BJK2023110);廊坊师范学院应用型示范课程资助项目(YYSFKC-2023-39)。

摘　　要：太赫兹通信兼具微波通信和光波通信的优势,是解决通信容量紧缺难题的最有效技术手段之一。针对太赫兹波段吸收损耗严重及抗外在扰动差,难以支持长距传输问题,设计了一种基于环形光子晶体光纤(PCF)结构的新型太赫兹光纤。以现有常见材料作为光纤基底材质,通过创新光纤结构中空气孔排布方式,抵消材料高吸收损耗,以支持高性能轨道角动量(OAM)模式传输。选择最优参数,实现6个OAM模式群的高模式质量、低限制损耗和宽带宽的稳定传输。在0.2~0.9 THz宽波段内,实现模式纯度超过88.9%,限制损耗小于10^(-7) dB/m。通过软件仿真实验设计,解决了太赫兹与OAM技术相结合的关键问题,为模分复用(MDM)技术在太赫兹通信系统的应用奠定了理论研究基础。Terahertz communication has the advantages of both microwave communication and optical communication,which is one of the most effective technical means to solve the problem of communication capacity shortage.In order to solve the problems of serious absorption loss and poor external disturbance resistance in terahertz band,a new terahertz fiber based on circular Photonic Crystal Fiber(PCF)structure is designed to support high performance Orbital Angular Momentum(OAM)modes transmission.The existing common materials are used as the fiber base material,and the high absorption loss of materials is offset by the innovation of hollow porosity arrangement in the fiber structure.The optimal parameters are selected to realize the stable transmission of six OAM mode groups with high mode quality,low confinement loss and wide bandwidth.The mode purity is above 88.9%and the confinement loss is below 10^(-7) dB/m in the 0.2~0.9 THz band.Through simulation,the key problem of combining terahertz and OAM technology is solved,which lays a theoretical foundation for the application of Mode Division Multiplexing(MDM)technology in terahertz communication system.

关 键 词：轨道角动量 太赫兹通信 光子晶体光纤 模分复用 

分 类 号：TN914[电子电信—通信与信息系统]