3D-Printed Terahertz Subwavelength Dual-Core Fibers With Dense Channel-Integration

作者：Haiyuan Ge, Haisu Li, Jie Lu, Jianshuai Wang, Yang Cao, Shaghik Atakaramians, Yandong Gong, Guobin Ren, Li Pei · 发表于：Journal of Lightwave Technology · 年份：2024 · DOI：10.1109/jlt.2024.3487649 · 被引用次数：4 · 研究领域：Photonic and Optical Devices、Semiconductor Lasers and Optical Devices、Spectroscopy and Laser Applications

Terahertz (THz) fiber that provides high-speed connections is one of the most essential components in THz communication systems. The emerging space-division-multiplexing technology is expected to increase the transmission capacity of THz communications. A promising candidate to achieve that is integrating multiple channels in a compact THz multi-core fiber system. Here, we propose and experimentally demonstrate a THz subwavelength rectangular dielectric dual-core fiber structure, where two identical cores can be densely integrated, thanks to the polarization-maintaining feature of the rectangular fiber. Different configurations of the fiber structure, including the placements, core-spacings, and polarization states of two fiber cores, are comprehensively investigated to improve the channel isolation. Numerical simulations show that the fractional power in core of fiber mode has a dominant effect on inter-core coupling performance. Moreover, we design the core size (1 mm × 0.5 mm) slightly less than the WR5.1 waveguide (1.295 mm × 0.6475 mm) so that the fiber can be conveniently connected with the WR5.1 flange port with mode excitation efficiencies up to 62.8%. A cost-efficient dielectric 3D printing technique is employed for rapid fabrications of dual-core fibers as well as corresponding polymer flange structures that offer solid integration between the fiber samples and the WR5.1 port. Experimental measurements of dual-core fibers demonstrate that a 4-mm core-spacing (less t...