Average capacity of an absorptive turbulent ocean channel with diffraction-and attenuation-resistant beam carriers

Abstract

The absorption and turbulent diffraction of seawater are important factors that restrict the channel capacity of an underwater optical communication system. Therefore, we derive the model for the capacity of the turbulent seawater communication channel with a diffraction-and attenuation-resistant random (DARR) vortex beam as a signal carrier, and study the influence of absorbing turbulent seawater on the capacity of optical communication channel. DARR beam is a large-scale Gaussian aperture truncated diffracting and absorption resistance waves. We find that with the increase of the number of channels, the total loss of channel capacity caused by absorptive turbulent ocean channel is basically unchanged, the optical communication channel with longer wavelength and smaller receiving diameter has higher channel capacity. Compared with the Laguerre–Gaussian beam and the Bessel–Gaussian beam, DARR beams are more resistant to seawater turbulence and seawater absorption.