太赫兹多维复用与折射率传感集成器件  

Terahertz Multidimensional-Multiplexing and Refractive-Index-Sensing Integrated Device

作　　者：揭璐 李海粟 刘亚静[1] 王建帅[1] 任国斌[1] 裴丽[1] Jie Lu;Li Haisu;Liu Yajing;Wang Jianshuai;Ren Guobin;Pei Li(Key Laboratory of All Optical Network and Advanced Telecommunication Network,Ministry of Education,Institute of Lightwave Technology,Beijing Jiaotong University,Beijing 100044,China)

机构地区：[1]北京交通大学光波技术研究所全光网络与现代通信网教育部重点实验室,北京100044

出　　处：《光学学报》2024年第8期229-241,共13页Acta Optica Sinica

基　　金：中央高校基本科研业务费专项资金(2022JBZY004);国家自然科学基金(62075007,62275011)。

摘　　要：提出了一种基于亚波长偏振保持光纤的多维复用与折射率(RI)传感集成器件。该器件由定向耦合器、Y型分束器和布拉格光栅器件构成,能够同时实现三维空间中偏振和频率(解)复用、色散补偿以及RI传感功能。集成器件下行端口输出偏振解复用后的x偏振态,其在0.25 THz频率处的传输率和消光比分别为-5.94 dB和15.16 dB。此后,原波导中y偏振态(工作频率为0.25 THz)与x偏振态(工作频率为0.27 THz)复用后于直通端口输出,传输率分别为-7.20 dB和-2.02 dB。同时,集成的均匀光栅和π相移光栅可分别实现色散补偿(群速度色散为-109.4 ps·THz^(-1)·mm^(-1))和RI传感(灵敏度为0.181 THz/RIU)功能。基于太赫兹亚波长光纤的集成器件在下一代通感一体化信息系统中具有良好的应用前景。Objective Terahertz waves featuring broad bandwidths play an increasingly important role in next-generation communication systems.For both terahertz wired and wireless communications,terahertz waveguide integrated devices providing on-line signal processing functionalities are in vital demand.In the next-generation communication system,the multiplexing technology around the electromagnetic wave physical parameters such as terahertz radiation polarization,frequency,and phase is an effective solution to enhancing spectrum efficiency.Additionally,the future Internet of Everything information system should have a real-time monitoring function of communication environmental parameters(temperature,humidity,etc.).Given the above technical requirements of multidimensional multiplexing and environmental sensing,novel terahertz functional integrated devices for high-speed information transmission-manipulation-perception fusion should be studied urgently.Several terahertz silicon-based waveguide devices have been demonstrated,but the planar structure restricts the spatial degree of freedom for the devices,which means the devices can only be integrated in a 2D plane.Terahertz fiber-based devices are substrate-free to provide terahertz wave routing abilities along any spatial direction.Nevertheless,most of the reported terahertz fiber devices offer a single functionality,remaining a significant scope of multiple device integration.Thus,we propose a polarization-maintaining subwavelength fiber-based multidimensional multiplexing and sensing integrated device which is composed of fiber bends,a 50/50 Y-splitter,directional couplers,and Bragg gratings.The proposed fiber device provides(de)multiplexing in an additional direction that is orthogonal to the 2D space in contrast to the planar devices.Meanwhile,the device integrates multiple functionalities,including frequency-and polarization-(de)multiplexing,dispersion compensation,and surrounding refractive index sensing.In a nutshell,the integrated device provides exciting perspect

关 键 词：光学器件 太赫兹 耦合器 复用器 传感器 

分 类 号：O436[机械工程—光学工程]