High-capacity free-space optical link in the midinfrared thermal atmospheric windows using unipolar quantum devices - Télécom Paris
Article Dans Une Revue Advanced photonics Année : 2022

High-capacity free-space optical link in the midinfrared thermal atmospheric windows using unipolar quantum devices

Résumé

Free-space optical communication is a very promising alternative to fiber communication systems, in terms of ease of deployment and costs. Midinfrared light has several features of utter relevance for free-space applications: low absorption when propagating in the atmosphere even under adverse conditions, robustness of the wavefront during long-distance propagation, and absence of regulations and restrictions for this range of wavelengths. A proof-of-concept of high-speed transmission taking advantage of intersubband devices has recently been demonstrated, but this effort was limited by the short-distance optical path (up to 1 m). In this work, we study the possibility of building a long-range link using unipolar quantum optoelectronics. Two different detectors are used: an uncooled quantum cascade detector and a nitrogen-cooled quantum well-infrared photodetector. We evaluate the maximum data rate of our link in a back-to-back configuration before adding a Herriott cell to increase the length of the light path up to 31 m. By using pulse shaping, pre- and post-processing, we reach a record bitrate of 30 Gbit s − 1 for both two-level (OOK) and four-level (PAM-4) modulation schemes for a 31-m propagation link and a bit error rate compatible with error-correction codes.
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hal-03886019 , version 1 (28-08-2024)

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Pierre Didier, Hamza Dely, Thomas Bonazzi, Olivier Spitz, Elie Awwad, et al.. High-capacity free-space optical link in the midinfrared thermal atmospheric windows using unipolar quantum devices. Advanced photonics, 2022, 4 (5), pp.056004. ⟨10.1117/1.AP.4.5.056004⟩. ⟨hal-03886019⟩
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