Wavefront sensing for terrestrial, underwater, and space-borne free-space optical communications

Szymon Gladysz; Andreas Zepp; Max Segel; Douglas McDonald; Raphael Bellossi; Daniel Lechner; Osvaldo Javier Galicia Gasperin; Karin Stein

doi:10.1117/12.2595727

1 August 2021 Wavefront sensing for terrestrial, underwater, and space-borne free-space optical communications

Szymon Gladysz, Andreas Zepp, Max Segel, Douglas McDonald, Raphael Bellossi, Daniel Lechner, Osvaldo Javier Galicia Gasperin, Karin Stein

Author Affiliations +

Proceedings Volume 11834, Laser Communication and Propagation through the Atmosphere and Oceans X; 118340F (2021) https://doi.org/10.1117/12.2595727
Event: SPIE Optical Engineering + Applications, 2021, San Diego, California, United States

Abstract

We present several solutions to problems particular to adaptive optics for free-space laser-based communications. Specifically, for scenarios where strong scintillation is present, we have developed a digital, adaptable Shack-Hartmann wavefront sensor, as well as the modal holographic wavefront sensor based on the Karhunen-Loève modes. Additionally, using the same modal basis and optimization algorithms from deep learning, we have improved upon stochastic parallel gradient descent wavefront-sensorless approach. For underwater communications, we have set up a water tank and demonstrated real-time adaptive optics in the visible. For deep-space downlinks, we have investigated several wavefrontsensing modalities with respect to their robustness to very low signal-to-background ratios expected during daytime. We also present results of data transmission experiments using coherent modulation over a 400-m double-pass horizontal link.

Conference Presentation

Citation Download Citation

Szymon Gladysz, Andreas Zepp, Max Segel, Douglas McDonald, Raphael Bellossi, Daniel Lechner, Osvaldo Javier Galicia Gasperin, and Karin Stein "Wavefront sensing for terrestrial, underwater, and space-borne free-space optical communications", Proc. SPIE 11834, Laser Communication and Propagation through the Atmosphere and Oceans X, 118340F (1 August 2021); https://doi.org/10.1117/12.2595727

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