Optical: systems and elements – Deflection using a moving element – Using a periodically moving element
Patent
1994-09-30
1996-07-30
Boudreau, Leo
Optical: systems and elements
Deflection using a moving element
Using a periodically moving element
359140, 359183, 25022712, H04B 1008
Patent
active
055417558
ABSTRACT:
Apparatus and methods are disclosed for readjusting a modulation shift of a transmission light modulated optical signal. In these systems and methods, a first modulated portion of the modulated transmission light is removed to obtain a first modulated signal which is divided into first and second light beams. The first light beam is delayed by a specific delay time and the first and second light beams are coherently superimposed to obtain an optical superposition signal which is detected to produce a detector signal that is proportional to a power of the superposition signal. An error signal is subsequently generated from the detector signal which is representative of a modulation shift from a desired shift value which is used for substantially correcting a modulation of the transmission light.
REFERENCES:
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Auracher Franz
Noe Reinhold
Boudreau Leo
Negash Kinfe-Michael
Siemens Aktiengesellschaft
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