80-Gbit/s 100-m Free-Space Optical Data Transmission Link via a Flying UAV Using Multiplexing of Orbital-Angular-Momentum Beams
Long Li, Runzhou Zhang, Zhe Zhao, Guodong Xie, Peicheng Liao, Kai, Pang, Haoqian Song, Cong Liu, Yongxiong Ren, Guillaume Labroille, Pu Jian,, Dmitry Starodubov, Robert Bock, Moshe Tur, Alan E. Willner

TL;DR
This paper demonstrates an 80 Gbit/s free-space optical data link to a moving UAV using multiplexed orbital-angular-momentum beams, showing robustness under various flight conditions and channel impairments.
Contribution
It is the first experimental demonstration of high-capacity OAM-multiplexed FSO communication with a moving UAV, analyzing channel impairments and crosstalk effects.
Findings
Achieved 80 Gbit/s capacity over 100 meters with 2 OAM beams.
Power fluctuation increases from 2.1 dB to 4.3 dB when UAV moves.
Crosstalk improves with increased OAM mode spacing.
Abstract
We explore the use of orbital-angular-momentum (OAM)-multiplexing to increase the capacity of free-space data transmission to moving platforms, with an added potential benefit of decreasing the probability of data intercept. Specifically, we experimentally demonstrate and characterize the performance of an OAM-multiplexed, free-space optical (FSO) communications link between a ground station and a moving unmanned-aerial-vehicle (UAV). We achieve a total capacity of 80 Gbit/s up to 100-m-roundtrip link by multiplexing 2 OAM beams, each carrying a 40-Gbit/s quadrature-phase-shift-keying (QPSK) signal. Moreover, we investigate for static, hovering, and moving conditions the effects of channel impairments, including: tracking errors, propeller-induced airflows, power loss, intermodal crosstalk, and system bit error rate (BER). We find the following: (a) when the UAV hovers in the air, the…
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Taxonomy
TopicsOptical Wireless Communication Technologies · Orbital Angular Momentum in Optics · Optical Network Technologies
