Abstract
Rytov theory is employed to analyze the spiral spectrum and orbital angular momentum (OAM) crosstalk effects of partially coherent Bessel Gaussian localized wave (BGLW) in the completely weak to strong anisotropic atmospheric turbulence channel. Propagation quality of OAM mode carried by BGLW is superior to that of the traditional Bessel Gaussian (BG) beam in the turbulence, which provide a good choice for OAM based optical communication. Atmospheric turbulence grows up with the increase of Reynolds number, the effects of the atmospheric turbulence parameters (anisotropy parameters, power spectrum index and refractive index structure constant) on the OAM modal detection probability also enhance. The influence of atmospheric turbulence can be reduced by increasing the half pulse width of the input pulse and wavelength of BGLW. The research results provide a theoretical basis for the performance evaluations and parameters optimization of practical OAM based optical communication technology.
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