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Field Demonstration of Turbulence-Resilient Self-Coherent Free-Space Optical Communications

McDonald, Douglas, Bellossi, Raphaël, Gładysz, Szymon·2025·Journal of Lightwave Technology
DOI 10.1109/jlt.2025.3564551
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Abstract

We experimentally demonstrate a self-coherent freespace optical communications (FSOC) system based on the pilot-assisted scheme. By co-propagating the data-carrying beam with a continuous-wave pilot, the scheme reduces turbulenceinduced losses in spatial coherence between the beams, which can adversely affect the performance of local oscillator (LO)- based coherent systems. The system utilizes a single free-space photodetector and self-coherent detection based on the Kramers- Kronig receiver to minimize receiver hardware complexity. Using an 800 m free-space link, we transmit a 10 Gbit/s 16-QAM single polarization signal over real atmospheric turbulence. Additionally, we present a method for simultaneous characterization of the atmospheric channel by recording image sequences of the received laser spot. Results demonstrate the robustness of the system in moderate turbulence, and serve as the first field demonstration of this approach over a real free-space link.

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Research works printed but not linked: 29

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  19. 10.1364/JOSA.57.000169 · DOI
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Metadata

Authors
McDonald, D., Bellossi, R., & Gładysz, S.
Affiliations
Fraunhofer Institute of Optronics, Fraunhofer IOSB, Ettlingen, System Technologies and Image Exploitation, Gutleuthausstr. 1, Ettlingen, Germany
ORCID
Venue
Journal of Lightwave Technology
Publisher
Institute of Electrical and Electronics Engineers (IEEE)
Published
2025-07-01
Volume
43
Issue
13
Pages
6146-6153
ISSN
  • 0733-8724
  • 1558-2213
DOI
10.1109/jlt.2025.3564551
Cited by
14
References
0
Licence
creativecommons.org/licenses/by/4.0/legalcode (vor)
Funders
Technical Center of Weapons and Ammunition (VBLUES)

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