LIGHT BEAM CONTROLLING SYSTEM FOR COMMUNICATION

摘要

PURPOSE:To correct a shift of the optical path of an optical beam with a simple operation for a communication system which performs the transmission of information by propagating the optical beam in a space, by displacing the optical path after detecting a shift of the light receiving position. CONSTITUTION:The optical beam transmitted from a transmitting side 1 is condensed through a lens 7 and then received at a receiving side through a half mirror 21. The light beam branched to the upper part by the mirror 21 is received by a control photodetector 22. Then the receiving position of the light beam is detected the photodetectors which are arranged 7X7 for example. The inserting position is decided by a microprocessor 23 for the prisims 19-0 and 19-1 so that the shift of the optical path of the light beam based on a detecting signal given from the photodetector 22. Based on this decision, the two prisms 19-0 and 19-1 are shifted.