Real-time adaptive optics testbed to investigate point-ahead angle in pre-compensation of Earth-to-GEO optical communication | Zendy

Nina Leonhard | Zendy; René Berlich | Zendy; Stefano Minardi | Zendy; Alexander Barth | Zendy; Steffen Mauch | Zendy; Jacopo Mocci | Zendy; Matthias Goy | Zendy; Michael Appelfelder | Zendy; Erik Beckert | Zendy; Claudia Reinlein | Zendy

Open Access

Real-time adaptive optics testbed to investigate point-ahead angle in pre-compensation of Earth-to-GEO optical communication

Author(s) -

Nina Leonhard,

René Berlich,

Stefano Minardi,

Alexander Barth,

Steffen Mauch,

Jacopo Mocci,

Matthias Goy,

Michael Appelfelder,

Erik Beckert,

Claudia Reinlein

Publication year - 2016

Publication title -

optics express

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.394

H-Index - 271

ISSN - 1094-4087

DOI - 10.1364/oe.24.013157

Subject(s) - strehl ratio , optics , geostationary orbit , free space optical communication , breadboard , adaptive optics , telecommunications link , compensation (psychology) , optical communication , fading , physics , communications satellite , computer science , satellite , electronic engineering , telecommunications , engineering , psychology , decoding methods , astronomy , psychoanalysis

We explore adaptive optics (AO) pre-compensation for optical communication between Earth and geostationary (GEO) satellites in a laboratory experiment. Thus, we built a rapid control prototyping breadboard with an adjustable point-ahead angle where downlink and uplink can operate both at 1064 nm and 1550 nm wavelength. With our real-time system, beam wander resulting from artificial turbulence was reduced such that the beam hits the satellite at least 66% of the time as compared to merely 3% without correction. A seven-fold increase of the average Strehl ratio to (28 ± 15)% at 18 μrad point-ahead angle leads to a considerable reduction of the calculated fading probability. These results make AO pre-compensation a viable technique to enhance Earth-to-GEO optical communication.

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