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Cooperative FSO and mmWave System for Reliable 200G Wireless Transmission

Brandão, B. ; Fernandes, M. ; Loureiro, Pedro A. Loureiro ; Guiomar, F. P. ; Monteiro, P.

IEEE Photonics Technology Letters Vol. 34, Nº 24, pp. 1333 - 1336, December, 2022.

ISSN (print): 1041-1135
ISSN (online): 1041-1135

Scimago Journal Ranking: 0,75 (in 2021)

Digital Object Identifier: 10.1109/LPT.2022.3213985

Abstract
The use of free-space optics (FSO) for ultra-high-speed communications has been recently standing out as a promising alternative for fiber/wireless-based scenarios. However, FSO communications still suffer from variations in the received optical power due to atmospheric turbulence and weather instability, which limits its use in reliability-driven applications. To explore the full potential of FSO and maintain communications reliability, hybrid FSO and radio-frequency systems can be employed to leverage the strengths of the two technologies. In this letter, we demonstrate a 3m hybrid FSO and millimeter-wave system for 200G stable wireless transmission. Resorting to time-adaptive probabilistic constellation shaping and a cross-domain entropy loading scheme, we are able to compensate for up to 15% (30Gbps) of data-rate reduction in the FSO link. Comparing with FSO-only transmission, we demonstrate a cumulative capacity gain of over 150Gbps after 40 offline measurement iterations.