Method and device for obtaining error signals for spatial beam regulation of an optical coherent receiver
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United States of America Patent
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Nov 23, 1999
Grant Date -
N/A
app pub date -
Jul 22, 1997
filing date -
Sep 22, 1996
priority date (Note) -
Expired
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Abstract
In connection with a method and a device for the control of the optical alignment of two lightwaves in the course of a coherent superimposed reception a spatial beam regulation is achieved in that the light of a local laser (5) is superimposed on the received light (1), that then the signal obtained in this manner is divided into two identical beam portions (1A, 1B) by means of a beam splitter (2) and that a respective error signal (14, 16) is generated from the two portions by means of a respective detector arrangement (3, 4), so that the two error signal portions result in a spatial error signal. The original data signal (15) is again obtained by the addition with the correct signs of the error signal portions.
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