ELECTRO-OPTICAL MODULATION APPARATUS USING A SQUARE-WAVE SIGNAL

摘要

An electro-optical modulation apparatus for modulating the orientation of the plane of polarization of an information carrying light beam uses a square-wave voltage to energize one of three birefringent crystals located in the light beam to a level necessary for rotating the plane of polarization of the energizing beam 90 DEG . The energizing beam is split into subbeams by a polarization sensitive beam splitter and directed to two radiation detectors through corresponding polarizers.