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We explore the influence of absorption, anisotropy and unstable layered turbulence on the channel capacity of horizontal seawater link. By developing the spectrum average coherence length of collimated beam wave in the absorptive seawater turbulence, we propose a model of the channel capacity of links with carrier Bessel-Gaussian vortex localized wave. Our model shows that the capacity of links increases with the increasing of the half-modulated pulse width of the input pulse, the rate of dissipation of kinetic energy per unit mass of fluid and the anisotropic factor of turbulence, but it decreases with the increasing 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, the channel capacity is more sensitive to salinity fluctuations than to temperature fluctuations in turbulence, and the influences of the inner scale and outer scale of turbulence on channel capacity of links in anisotropic turbulence and isotropic turbulence are different.

Capacity of communication link with carrier of vortex localized wave in absorptive turbulent seawater