Transmittance of finite-energy frozen beams in oceanic turbulence

Abstract

Frozen waves have the good characteristic for resisting the diffraction and absorption in absorbing medium, which can solve the low transmittance of light waves in seawater. By the turbulence spectrum of seawater and the theory of frozen waves, we develop a frozen wave theory for random field and establish a transmittance model for finite energy frozen beams and analyze the diffracting- and absorption-resistance of finite energy frozen waves from the beam transmission wavelength, beam waist, beam orbital angular momentum quantum number, inner scale of turbulence, outer scale of turbulence, the “temperature structure” constant and the ratio of temperature and salinity. The transmittance of for finite energy frozen waves decreases as the propagation distance increases, and by designing longitudinal profile we can compensate the attenuation loss of the transmittance. We derive that the frozen wave has an optimal wavelength window in “seawater transmission window”. Our results theoretically provide a feasible basis for the establishment of underwater multipoint base station optical communication network.