In this work, we present an in-depth experimental and numerical study of the short-range THz communications links that use subwavelength dielectric fibers for information transmission and define main challenges and tradeoffs in the link implementation. Particularly, we use air or foam-cladded polypropylene-core subwavelength dielectric THz fibers of various diameters (0.57-1.75 mm) to study link performance as a function of the link length of up to ~10 m, and data bitrates of up to 6 Gbps at the carrier frequency of 128 GHz (2.34 mm wavelength). We find that depending on the fiber diameter, the quality of the transmitted signal is mostly limited either by the modal propagation loss or by the fiber velocity dispersion (GVD). An error-free transmission over 10 meters is achieved for the bit rate of 4 Gbps using the fiber of smaller 0.57 mm diameter. Furthermore, since the fields of subwavelength fibers are weakly confined and extend deep into the air cladding, we study the modal field extent outside of the fiber core, as well as fiber bending loss. Finally, the power budget of the rod-in-air subwavelength THz fiber-based links is compared to that of free space communication links and we demonstrate that fiber links offer an excellent solution for various short-range applications.
Significant Light Extraction and Power Efficiency Enhancement of Organic Light Emitting Diodes by Subwavelength Dielectric-Nanomesh Using Large-area Nanoimprint
Near-Field Coupling of Polypropylene Dielectric Waveguide Routed Near PCB Board at Terahertz Frequencies
School of Integrated Circuits and Electronic, Beijing Institute of Technology（北京理工大学集成电路与电子学院）；State Key Laboratory of Environment Characteristics and Effects for Near-space（临近空间环境特性及效应国家重点实验室）；School of Electronic and Information Engineering, Hebei University of Technology（河北工业大学电子信息工程学院）；Advanced Laser Technology Research Center（先进激光技术研究中心）
Field-material coupled neural network: A novel prior-free and data-free inverse problem solver for extracting complex dielectric constant in terahertz band
Bundesanstalt für Materialforschung und -prüfung (BAM)（联邦材料研究与测试研究所）；Department of Industrial and Information Engineering and Economics (DIIIE), University of L’Aquila（拉奎拉大学工业与信息技术工程及经济系）；Faculty of Environmental and Technology Manufacturing, Technical University in Zvolen（兹沃伦技术大学环境与技术制造学院）；Geology Division, School of Science and Technology (SST), Università degli Studi di Camerino（卡梅里诺大学科学与技术学院地质学部）；Department of Electrical and Computer Engineering, Computer Vision and Systems Laboratory (CVSL), Laval University（拉瓦尔大学电气与计算机工程系计算机视觉与系统实验室）
