SINGLE SIDE BAND MODULATOR

The modulator for an optical communications system uses an interferometer with an acousto-optical modulator (13,24) in each interferometer path and 90 degrees phase shift between the light beams for the 2 paths. Each of the acousto-optical modulators (13,24) is controlled by an amplitude-modulated H...

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Bibliographische Detailangaben
Hauptverfasser:	RATHJEN, DIRK, BURGGRAF, HUBERT
Format:	Patent
Sprache:	eng ; ger
Schlagworte:	DEVICES OR ARRANGEMENTS, THE OPTICAL OPERATION OF WHICH ISMODIFIED BY CHANGING THE OPTICAL PROPERTIES OF THE MEDIUM OF THEDEVICES OR ARRANGEMENTS FOR THE CONTROL OF THE INTENSITY,COLOUR, PHASE, POLARISATION OR DIRECTION OF LIGHT, e.g.SWITCHING, GATING, MODULATING OR DEMODULATING ELECTRIC COMMUNICATION TECHNIQUE ELECTRICITY FREQUENCY-CHANGING NON-LINEAR OPTICS OPTICAL ANALOGUE/DIGITAL CONVERTERS OPTICAL LOGIC ELEMENTS OPTICS PHYSICS TECHNIQUES OR PROCEDURES FOR THE OPERATION THEREOF TRANSMISSION
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Beschreibung
Zusammenfassung:	The modulator for an optical communications system uses an interferometer with an acousto-optical modulator (13,24) in each interferometer path and 90 degrees phase shift between the light beams for the 2 paths. Each of the acousto-optical modulators (13,24) is controlled by an amplitude-modulated HF signal with the envelope curve providing the signal for modulation of the light carrier. The upper and lower side bands are obtained separately at the output of the interferometer. Pref. a common HF generator (32) is coupled to each acousto-optical modulator (13,24) via a respective amplitude modulator (31,33), with a 90 degree phase-shifter (34) in front of one of the latter.