Average capacity of wireless optical links using Laguerre-Gaussian beam through non-Kolmogorov turbulence based on generalized modified atmospheric spectral model

摘要

Based on the generalized modified spectral model for non-Kolmogorov atmospheric turbulence, analytical expression for the spiral spectrum of Laguerre-Gaussian beam with orbital angular momentum propagating through a slant non-Kolmogorov turbulence channel has been derived. The average capacity of wireless optical links using Laguerre-Gaussian beam carrying orbital angular momentum in former channel is obtained. The effects of atmospheric conditions and beam parameters on average capacity are numerically demonstrated and analyzed in detail. It is shown that, the average capacity under generalized modified spectral model decreases 37.01% of the original value, which is the most rapidly than those of generalized von Karman spectrum (13.85%) and generalized exponential spectrum model (33.36%) for the same propagation distance z= 1km, which should be considered in the realistic optical links.