Detection of the orbital angular momentum of a laser beam by means of its decomposition into optical vortices and its use in a communication system in the turbulent atmosphere
V.P. Aksenov1, V.V. Dudorov1, V.V. Kolosov1,2, C.E. Pogutsa1, E.S. Abramova3
1V.E. Zuev Institute of Atmospheric Optics of Siberian Branch of the Russian Academy of Science, Tomsk, Russia
2Tomskiy Nauchnyy Tsentr SO Ran, Tomsk, Russia
3Siberian State University of Telecommunications and Information Sciences, Novosibirsk, Russia
Keywords: орбитальный угловой момент, оптический вихрь, статистические характеристики, турбулентная атмосфера, оптическая связь, лагерр-гауссов пучок, азимутальные моды, orbital angular momentum, optical vortex, statistical characteristics, turbulent atmosphere, optical communication, Laguerre-Gaussian beam, azimuthal modes
Abstract
The numerical simulation of the operation of an optical data transmission system operating through an open atmospheric channel with information coding by the magnitude of the orbital angular momentum (OAM) has been performed. Two methods for detecting OAM based on representing the complex amplitude of the field of a laser beam transmitted through a layer of a turbulent atmosphere in the form of a superposition of a finite number of azimuthal modes (optical vortices) are considered. A statistical analysis of the dependence of the reception frequency of OAM recorded with errors due to atmospheric turbulence on the turbulence strength is performed. The analysis was carried out for a sample of 5000 random realizations of the complex field amplitude during the propagation of a laser beam along an atmospheric path with fixed turbulent parameters. Options and potential possibilities of hardware implementation of the methods proposed are discussed. Their effectiveness is compared.
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