METHOD AND DEVICE FOR CONTROLLING THE ALIGNMENT OF TWO LIGHTWAVES IN THE COURSE OF A COHERENT SUPERIMPOSED RECEPTION

摘要

In connection with a method and a device for the control of theoptical alignment of two lightwaves in the course of a coherentsuperimposed reception, a spatial beam regulation is achieved in that thelight of a local laser (5) is superimposed on the received light (1), thatthen the signal obtained in this manner is divided into two identical beamportions (1A, 1B) by means of a beam splitter (2) and that a respectiveerror signal (14, 16) is generated from the two portions by means of arespective detector arrangement (3, 4), so that the two error signalportions result in a spatial error signal. The original data signal (15) isagain obtained by the addition with the correct signs of the error signalportions.