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6 September 2019 Analysis and mitigation of turbulence-induced distortions using adaptive optics for improved communication signal detection
Carlos Pirela, Jaime Anguita, Gustavo Funes, Jaime Cisternas
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Proceedings Volume 11133, Laser Communication and Propagation through the Atmosphere and Oceans VIII; 1113303 (2019) https://doi.org/10.1117/12.2529314
Event: SPIE Optical Engineering + Applications, 2019, San Diego, California, United States
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.
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Carlos Pirela, Jaime Anguita, Gustavo Funes, and Jaime Cisternas "Analysis and mitigation of turbulence-induced distortions using adaptive optics for improved communication signal detection", Proc. SPIE 11133, Laser Communication and Propagation through the Atmosphere and Oceans VIII, 1113303 (6 September 2019); https://doi.org/10.1117/12.2529314
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KEYWORDS
Adaptive optics
Signal detection
Turbulence
Atmospheric propagation
Free space optics
Optical communications
Wavefront sensors
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