Optical axis adjustment of laser beam transmission system

This paper studies the laser beam alignment method for free space optical communication. Distributed control system is designed to administer laser beam direction for stable bilateral optical transmission system. Strategic process is proposed to keep optical line connected, as well as the initial adjustment procedure of the laser beam. Analytic and statistic estimation methods of the laser beam alignment are investigated based on the Gaussian beam optics. Computer simulation evaluates the accuracy of the proposed estimation methods, and experiments disclose that the methods help us to find the optical axis of laser beam and to adjust it to the receiver mounted on the remote FSO equipment.