free - space optics is an unlicensed line - of - sight technology that uses modulated optical lasers to transmit information through the atmosphere . by using invisible beams of light , fso can transmit and receive voice , video , and data information . to date , the primary concentration of fso research and development has been toward the accurate alignment between two transceivers . the invention provides viable optical beam steering and capturing mechanism to allow fast tracking and accurate pointing between two transceivers of free - space optic link that required continuous alignment . this extra ordinary auto - tracking system can reduce the time needed to lock a laser beam between an aircraft and a stationery base station to exchange information in addition to its high accuracy . this invention also provides wider receiving angle compared with the conventional fso system .