Influence of strong anisotropic turbulent atmosphere on single photons carrying orbital angular momentum states

We model the effective spectrum of anisotropic and weak to strong turbulence of terrene-atmosphere based on the modified Rytov approximation. The normalized probability of the orbital angular momentum (OAM) states and channel capacity of the communication link are established by this effective spectrum. Our results reveal that the effects of anisotropic turbulence on the normalized probability of the OAM states and the channel capacity of link are less than the isotropic turbulence. This result provides additional support for anisotropic turbulence having less influence on beam propagation than the isotropic turbulence, especially in the strong fluctuation region. The effect of the turbulent anisotropy on the channel capacity in low dimension number of Hilbert space is larger than that in high dimension number of Hilbert space.