The optical coherent multi-carrier frequency (CMC) technique has progressed to a development level, where its application to switching techniques is discussed. Up to now point-to-point long distance transmission systems [1], the bidirectional subscriber line, TV/HDTV distribution systems and multipoint connections via a passive stair [2] were presented. These systems are characterized by signals on fixed optical carriers. Wavelength conversion was introduced by combining optical heterodyne receivers and transmitters [3].

© 1989 Optical Society of America

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