Research on the Modification of Departure Angle Detection for Free Space Optical Communications

Atmospheric turbulence leads to a stochastic process of optical intensity and phase of beam. Thus, errors of departure angle detection are induced. In the paper, a new method to modify of departure angle detection is introduced to Free Space Optical Communications. Based on the phase retrieval, the new method only needs the intensity of the image on the focal plane to calculate the revising phase. The complexity of the algorithm is reduced. The performance and its validity have been simulated in the paper. The results show that the errors of departure angle induced by the atmospheric turbulence become smaller.