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30 September 2022 Optimal transport theory for processing and classifying OAM superpositions distorted by turbulence
Jaime E. Cisternas, Jaime A. Anguita
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Proceedings Volume 12237, Laser Communication and Propagation through the Atmosphere and Oceans XI; 1223708 (2022) https://doi.org/10.1117/12.2633099
Event: SPIE Optical Engineering + Applications, 2022, San Diego, California, United States
Abstract
We propose the use of orbital angular momentum (OAM) states to form modulation symbols in a free-space laser communication link affected by atmospheric turbulence. A collection of superpositions of 2 and 4 active OAM modes are used for transmitting digital information. To sense and decode the data we compare three candidate architectures, based on a Mode Sorter, a Shack-Hartmann and phase flattening holograms. In this work we use concepts of Optimal Transport, particularly the Wasserstein distance and barycenter, for an optimal selection of OAM superpositions and a more appropriate processing of OAM spectra, leading to more accurate detection, achieving a classification error smaller than 1/1000 in intermediate to strong turbulence conditions.
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Jaime E. Cisternas and Jaime A. Anguita "Optimal transport theory for processing and classifying OAM superpositions distorted by turbulence", Proc. SPIE 12237, Laser Communication and Propagation through the Atmosphere and Oceans XI, 1223708 (30 September 2022); https://doi.org/10.1117/12.2633099
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KEYWORDS
Atmospheric propagation
Wavefront sensors
Atmospheric turbulence
Free space optics
Beam propagation method
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