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Received Probability of Vortex Modes Carried by Localized Wave of Bessel–Gaussian Amplitude Envelope in Turbulent Seawater

School of Science, Jiangnan University, Wuxi 214122, China
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J. Mar. Sci. Eng. 2019, 7(7), 203; https://doi.org/10.3390/jmse7070203
Received: 30 April 2019 / Revised: 25 June 2019 / Accepted: 28 June 2019 / Published: 30 June 2019
(This article belongs to the Special Issue Light Fields in the Ocean from Natural and Artificial Sources)
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Abstract

By using the two-frequency coherence function model of a beam in a turbulent medium and the localized wave theory of the polychromatic beam, we develop the spectrum average mutual coherence function of the localized wave of Bessel–Gaussian amplitude envelope and the spectrum average coherence length of spherical wave. By the spectrum average coherence length and the spectrum average mutual coherence function, we construct a received probability of vortex modes carried by localized wave of Bessel–Gaussian amplitude envelope in anisotropic turbulent seawater. Our results show that the received probability of signal vortex modes increases with the increase of half-modulated pulse width of the input pulse, turbulent inner scale, anisotropic factor of turbulence and rate of dissipation of kinetic energy per unit mass of fluid, but it increases with the decrease of the Bessel cone angle and the dissipation rate of the mean-squared temperature. We also find that there is a maximum effective beam waist for a given receiving aperture, and the vortex mode is more sensitive to salinity fluctuations than to temperature fluctuations in turbulence. Our conclusions show that localized wave of Bessel–Gaussian amplitude envelope is a more suitable beam for the vortex mode communication than conventional vortex waves. View Full-Text
Keywords: localized wave of Bessel–Gaussian amplitude envelope; spectrum average mutual coherence function; spectrum average coherence length; vortex modes; seawater turbulence localized wave of Bessel–Gaussian amplitude envelope; spectrum average mutual coherence function; spectrum average coherence length; vortex modes; seawater turbulence
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Deng, S.; Zhu, Y.; Zhang, Y. Received Probability of Vortex Modes Carried by Localized Wave of Bessel–Gaussian Amplitude Envelope in Turbulent Seawater. J. Mar. Sci. Eng. 2019, 7, 203.

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