Abstract
By developing new wave structure function of a beam waves, we derive the transmitting probability of signal vortex modes in oceanic turbulence based on Rytov approximation theory. Applying this transmitting probability of signal vortex modes, we study the influence of oceanic turbulence on the transmittance of the vortex modes carried by Mathieu-Gaussian beam. This model shows the transmitting probability of Mathieu-Gaussian beam with narrow initial beam width, long wavelength, and small ellipticity parameter is higher than the transmitting probability of the signal vortex modes in case of the beam with wide initial beam width, short wavelength, and great ellipticity parameter. Furthermore, when Mathieu-Gaussian beam has a suitable semi-cone angle, the effect of weak-turbulence channel on the transmitting probability of signal vortex modes with different topological charge can be ignored. Mathieu-Gaussian beam is a more suitable carrier for high information channel of underwater wireless optical communication than Laguerre-Gaussian beam.
Highlights
In recent years, underwater wireless optical communication have attracted a lot of attention due to the demands of underwater sensor networks, underwater unmanned devices, offshore exploration vessels and submarines [1,2,3,4,5]
To reduce the beam broadening caused by the beam edge diffraction and oceanic turbulence, quasi-diffracting free finite energy vortex beam become a new carrier of underwater wireless optical communication system
To explore the influence of beam structure parameters and oceanic turbulence parameters on the transmission of vortex modes, we numerically study the transmitting probability of signal vortex modes for a MG beam propagating in an anisotropic oceanic turbulence
Summary
Underwater wireless optical communication have attracted a lot of attention due to the demands of underwater sensor networks, underwater unmanned devices, offshore exploration vessels and submarines [1,2,3,4,5]. Because for that reason, there have been many reports on the performance of quasi-diffracting free finite energy vortex beam resist the beam expansion and channel capacity loss caused by oceanic turbulence [15,16,17,18,19,20,21,22,23]. Such as, the crosstalk probability of vortex modes of Lommel-Gaussian beam in anisotropic oceanic turbulence [15] and the beam wander of Lommel Gaussian-Schell beam in unstable stratification weak ocean-turbulence [16] were investigated. By the transmitting probability of the signal vortex modes for MG beam, we discussed the influences of beam structure parameters and oceanic turbulence parameters on the transmitting probability of signal vortex modes in numerical calculation
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