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Performance of a coherent free-space optical communications link with wavefront sensorless adaptive optics

: McDonald, Douglas; Segel, Max; Eichhorn, Marc; Gladysz, Szymon


Stein, K. ; Society of Photo-Optical Instrumentation Engineers -SPIE-, Bellingham/Wash.:
Environmental Effects on Light Propagation and Adaptive Systems III : 21-25 September 2020, Online Only
Bellingham, WA: SPIE, 2020 (Proceedings of SPIE 11532)
ISBN: 978-1-5106-3877-8
ISBN: 978-1-5106-3878-5
Paper 115320I, 14 pp.
Conference "Environmental Effects on Light Propagation and Adaptive Systems" <3, 2020, Online>
Conference Paper
Fraunhofer IOSB ()
free space optical communications; wavefront sensorless adaptive optics; coherent optical communications

Coherent free-space optical (FSO) communications systems present an opportunity for significantly increased data rates in wireless communications. To implement coherent FSO systems, degradation of received signals due to atmospheric propagation must be mitigated. This can be achieved by deploying adaptive optics (AO) systems at the optical receiver to reconstruct wavefronts deformed during propagation. In this work, we present the design and implementation of a coherent FSO communications system which utilizes a wavefront sensorless AO system to improve received signal quality. The performance of the communications system is quantified with and without the use of AO by measuring bit error ratio (BER) and error vector magnitude (EVM).