Optical: systems and elements – Deflection using a moving element – Using a periodically moving element
Patent
1997-07-22
1999-11-23
Negash, Kinfe-Michael
Optical: systems and elements
Deflection using a moving element
Using a periodically moving element
359190, H04B 1006
Patent
active
059910623
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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Fischer Edgar
Wandernoth Bernhard
Negash Kinfe-Michael
Oerlikon Contraves AG
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