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  4. Wavefront sensing for terrestrial, underwater, and space-borne free-space optical communications
 
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2021
Conference Paper
Title

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

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 wavefront sensing 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.
Author(s)
Gladysz, Szymon  
Fraunhofer-Institut für Optronik, Systemtechnik und Bildauswertung IOSB  
Zepp, Andreas  
Fraunhofer-Institut für Optronik, Systemtechnik und Bildauswertung IOSB  
Segel, Max  
Fraunhofer-Institut für Optronik, Systemtechnik und Bildauswertung IOSB  
McDonald, Douglas  
Fraunhofer-Institut für Optronik, Systemtechnik und Bildauswertung IOSB  
Bellossi, Raphaël
Fraunhofer-Institut für Optronik, Systemtechnik und Bildauswertung IOSB  
Lechner, Daniel
Fraunhofer-Institut für Optronik, Systemtechnik und Bildauswertung IOSB  
Galicia Gasperin, Osvaldo Javier
Fraunhofer-Institut für Optronik, Systemtechnik und Bildauswertung IOSB  
Stein, Karin  
Fraunhofer-Institut für Optronik, Systemtechnik und Bildauswertung IOSB  
Mainwork
Laser Communication and Propagation through the Atmosphere and Oceans X  
Conference
Conference "Laser Communication and Propagation through the Atmosphere and Oceans" 2021  
DOI
10.1117/12.2595727
Language
English
Fraunhofer-Institut für Optronik, Systemtechnik und Bildauswertung IOSB  
Keyword(s)
  • adaptive optics

  • wavefront sensing

  • atmospheric turbulence

  • free-space optical communication

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