Beam spread and wander of Gaussian beam through anisotropic non-Kolmogorov atmospheric turbulence for optical wireless communication

In the horizontal atmospheric turbulent channel of optical wireless communication (OWC), anisotropy has been proved to be one of essential properties. This paper investigates the long term beam spread and the beam wander of Gaussian beam based on the generalized anisotropic non-Kolmogorov power spectrum, where all the influence of the anisotropy of turbulence, the finite turbulence inner and outer scales, and the general spectral power law varying from 3 to 4 are considered simultaneously. As a result, new expressions of the long term beam spread and the beam wander are derived. Numerical simulations are performed to show the significant influence of the anisotropy, the finite inner and outer scales, and the general power law on the propagation of Gaussian beam.