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Coherent optical receiver for PPM signals under atmospheric turbulence

Muñoz Fernández, Michela and Vilnrotter, Victor A. (2005) Coherent optical receiver for PPM signals under atmospheric turbulence. In: Free-Space Laser Communication Technologies XVII. Proceedings of SPIE. No.5712. Society of Photo-optical Instrumentation Engineers (SPIE) , Bellingham, WA, pp. 162-173. ISBN 9780819456861.

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In free-space optical communications, atmospheric turbulence causes fluctuations in both the intensity and the phase of the received signal. We propose to use focal-plane arrays to collect optical signals from different spatial modes simultaneously, and then recombine them optimally. Experimental setup for proof-of-concept coherent adaptive array detection experiment using 32-Pulse Position Modulated (PPM) signals under atmospheric turbulence has been completed. Adaptive combining of experimentally obtained heterodyned PPM signals with pulse-to-pulse coherence, in the presence of simulated atmospheric turbulence is demonstrated. The adaptively combined PPM signals are phased up via a Least-Mean-Square (LMS) algorithm suitably optimized to operate with PPM in the presence of additive shot-noise, and detected via a maximum likelihood software receiver. Convergence study of the algorithm is presented and results with simulated PPM signals and real PPM signals experimentally obtained at the laboratory are presented.

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Additional Information:© 2005 Society of Photo-Optical Instrumentation Engineers (SPIE). The research described in this publication was carried out at the Jet Propulsion Laboratory, California Institute of Technology, under a contract with the National Aeronautics and Space Administration. The authors would like to acknowledge Carlos Esproles for his help in the laboratory.
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Subject Keywords:Atmospheric turbulence, coherent optical communications, pulse position modulation, focal plane array
Series Name:Proceedings of SPIE
Issue or Number:5712
Record Number:CaltechAUTHORS:20190221-110528665
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Official Citation:Michela Munyoz Fernandez and Victor A. Vilnrotter "Coherent optical receiver for PPM signals under atmospheric turbulence", Proc. SPIE 5712, Free-Space Laser Communication Technologies XVII, (18 April 2005); doi: 10.1117/12.591269;
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:93154
Deposited By: George Porter
Deposited On:22 Feb 2019 15:08
Last Modified:16 Nov 2021 16:55

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