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Proceedings Paper

Speckle-based sequential optimization of adaptive receivers in downlink laser communications
Author(s): Carlos E. Carrizo; Ramon Mata Calvo; Aniceto Belmonte
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Paper Abstract

Free-space optical communications (FSOC) are rapidly becoming a key technology for terrestrial, aerial, and space communication, mainly because of its very high throughput capacity. To achieve multi-gigabit laser downstream, an efficient single-mode fiber coupling is required. However, atmospheric turbulence remains one of FSOC’s main limitations. The turbulence affects the communications performance by inducing wavefront distortions that develop into coupled power fluctuations. In regimes of very strong turbulence, the use of traditional adaptive optics systems is limited due to strong scintillation and higher number of phase singularities. These limitations could be solved by relying on systems based on the stochastic iterative maximization of the coupled power. The drawback of such systems is that a high number of iterations are required for signal optimization. We address this problem and propose a different iterative method that compensates the distorted pupil phasefront by operating directly on the focal plane. The technique works by iteratively updating the phases of individual speckles to maximize the received power coupled into a single-mode fiber. We show numerically and experimentally that the method can improve the quality of the received signal with reduced bandwidth utilization.

Paper Details

Date Published: 9 October 2018
PDF: 9 pages
Proc. SPIE 10787, Environmental Effects on Light Propagation and Adaptive Systems, 107870C (9 October 2018); doi: 10.1117/12.2325675
Show Author Affiliations
Carlos E. Carrizo, German Aerospace Ctr. (DLR) (Germany)
Technical Univ. of Caralonia (Spain)
Ramon Mata Calvo, German Aerospace Ctr. (DLR) (Germany)
Aniceto Belmonte, Technical Univ. of Catalonia (Spain)

Published in SPIE Proceedings Vol. 10787:
Environmental Effects on Light Propagation and Adaptive Systems
Karin U. Stein; Szymon Gladysz, Editor(s)

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