Demonstration of Active Laser Beam Stabilization in Closed Loop for Free Space Optical Receiver

Abstract

AbstractActive beam stabilization is decisive in numerous applications such as free space optical (FSO) communication, military, biomedical etc. FSO communication receivers require very precise and stable pointing mechanism to maintain optimal operation. Any vibration, micro positional drift can affect efficiency and performance of active optical component and introduce an error which propagates throughout optical line [1]. Beam wandering and atmospheric effect also causes the contravention of FSO communication. In this paper we have demonstrated active beam stabilization technique using fast steering mirror (FSM) and Quad detector in closed loop for FSO receiver in laboratory. The quad-detector senses the error voltage according to the position of laser beacon. The error voltage is fed to FSM controller which is used in an external sensor feedback control mode with position feedback from quad photo detector and the FSM rectifies in the desired position.KeywordsAngular ErrorFree Space OpticalError VoltageFree Space Optical CommunicationMulti Mode FiberThese keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.