Analog FM free-space optical communication based on a mid-infrared quantum cascade laser frequency comb

Year: 2022

Authors: Corrias N.; Gabbrielli T.; De Natale P.; Consolino L.; Cappelli F.

Autors Affiliation: CNR-INO, Istituto Nazionale di Ottica, Largo Enrico Fermi 6 FI, Firenze, 50125, CNR-INO, Italy; LENS, European Laboratory for Non-Linear Spectroscopy, Via Nello Carrara 1 FI, Sesto Fiorentino, 50019, Italy

Abstract: Quantum cascade laser frequency combs are nowadays well-appreciated sources for infrared spectroscopy. Here their applicability for free-space optical communication is demonstrated. The spontaneously-generated intermodal beat note of the frequency comb is used as carrier for transferring the analog signal via frequency modulation. Exploiting the atmospheric transparency window at 4 mu m, an optical communication with a signal-to-noise ratio up to 65 dB is realized, with a modulation bandwidth of 300 kHz. The system tolerates a maximum optical attenuation exceeding 35 dB. The possibility of parallel transmission of an independent digital signal via amplitude modulation at 5 Mbit/s is also demonstrated. (C) 2022 Optica Publishing Group under the terms of the Optica Open Access Publishing Agreement

Journal/Review: OPTICS EXPRESS

Volume: 30 (7)      Pages from: 10217  to: 10228

More Information: Horizon 2020 Framework Programme, FET Flagship on Quantum Technologies, (820419 “Qombs Project”).
KeyWords: modulated combs; spectroscopy; linewidth; operation; search
DOI: 10.1364/OE.443483

Citations: 10
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