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Analysis and mitigation of turbulence-induced distortions using adaptive optics for improved communication signal detection
Author(s): Carlos Pirela; Jaime Anguita; Gustavo Funes; Jaime Cisternas
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Paper Abstract

An Adaptive Optics (AO) system may offer an alternative to compensate and correct for beam degradation by reducing turbulence distortions that affect signal detection over horizontal propagation. Based on an experimental testbed placed in the laboratory, we simultaneously study the effects of the communication signal detection, beam wavefront and image quality using a continuous membrane-type deformable mirror and Shack- Hartmann wavefront sensor. By inducing distorting effects on the beam with a Spatial Light Modulator and turbulence masks that are Rytov variance-equivalent to that of actual atmospheric scenarios, and by employing a Zernike polynomials decomposition, beam correction was achieved and signal detection improved. Our results show that both beam-spreading and beam-wandering were reduced after correction, but more significantly, the beam's intensity percentage over detector surface increased in 164%. Future improvements are discussed as an experimental campaign is being prepared to evaluate a closed-loop AO setup for an FSO communication link over a 400-m range at the university campus to evaluate the effectiveness of such approach at different hours of the day and weather conditions.

Paper Details

Date Published: 6 September 2019
PDF: 9 pages
Proc. SPIE 11133, Laser Communication and Propagation through the Atmosphere and Oceans VIII, 1113303 (6 September 2019); doi: 10.1117/12.2529314
Show Author Affiliations
Carlos Pirela, Univ. de los Andes (Chile)
Millennium Institute for Research in Optics (Chile)
Jaime Anguita, Univ. de los Andes (Chile)
Millennium Institute for Research in Optics (Chile)
Gustavo Funes, Univ. de los Andes (Chile)
Millennium Institute for Research in Optics (Chile)
Jaime Cisternas, Univ. de los Andes (Chile)
Millennium Institute for Research in Optics (Chile)


Published in SPIE Proceedings Vol. 11133:
Laser Communication and Propagation through the Atmosphere and Oceans VIII
Jeremy P. Bos; Alexander M. J. van Eijk; Stephen Hammel, Editor(s)

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