Influence of moderate-to-strong anisotropic non-Kolmogorov turbulence on intensity fluctuations of a Gaussian-Schell model beam in marine atmosphere

摘要

The scintillation index (SI) of a Gaussian-Schell model (GSM) beam in a moderate-to-strong anisotropic nonKolmogorov turbulent atmosphere is developed based on the extended Rytov theory.The on-axis SI in a marine atmosphere is higher than that in a terrestrial atmosphere,but the off-axis SI exhibits the opposite trend.The on-axis SI first increases and then begins to decrease and saturate as the turbulence strength increases.Turbulence inner and outer scales have different effects on the on-axis SI in different turbulent fluctuation regions.The anisotropy characteristic of atmospheric turbulence leads to the decline in the on-axis SI,and the rise in the off-axis SI.The on-axis SI can be lowered by increasing the anisotropy of turbulence,wavelength,and source partial coherence before entering the saturation attenuation region.The developed model may be useful for evaluating ship-to-ship/shore free-space optical communication system performance.