UDC 535.2
UDC 621.373.8
UDC 621.391.6
CSCSTI 29.31
Russian Classification of Professions by Education 03.03.02
Russian Library and Bibliographic Classification 223
Russian Trade and Bibliographic Classification 6135
BISAC SCI053000 Physics / Optics & Light
Vortex Bessel-Gaussian laser beams are one of the promising types of vortex beams, since they have the property of invariance to a certain extent. This paper presents an optical communication system using vortex Bessel-Gaussian laser beams. The detection strategy of this optical communication system is based on the orthogonality of vortex Bessel-Gaussian laser beams. The transmitter encodes the message symbols into the values of the topological charges of vortex Bessel-Gaussian laser beams. At the receiver, a multichannel correlation detector determines the value of the topological charge, i.e. the message symbol, by the value of the correlation metrics of the mutual coherence of the fields of vortex Bessel-Gaussian beams. The results of a theoretical study of correlation metrics of mutual coherence at the receiving aperture of fields of vortex Bessel-Gaussian beams with various topological charges in a turbulent atmosphere are presented. The expression for the second-order mutual coherence function of vortex Bessel-Gaussian beams in a turbulent atmosphere with different topological charges is obtained in the paraxial approximation using the extended Huygens – Fresnel principle. When constructing the solution, a quadratic approximation of the function describing the distorting influence of random inhomogeneities of the medium was used. The correlation metrics of mutual coherence at the receiving aperture of fields of Bessel-Gaussian beams with different topological charges are analyzed depending on the optical thickness of atmospheric turbulence. It is shown that the possibility of an optical communication system using Bessel-Gaussian beams based on topological charge coding of a beam with a multichannel correlation detector at the receiver is not significantly limited by the distorting effect of atmospheric turbulence.
optical vortex, Bessel-Gaussian beam, optical communication system, atmospheric turbulence, coherence, mean intensity
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