Analog FM free-space optical communication based on a mid-infrared quantum cascade laser frequency comb
OPTICS EXPRESS(2022)
摘要
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
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关键词
optical communication,quantum,frequency,laser,free-space,mid-infrared
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