Showing papers on "Optical Carrier transmission rates published in 1975"

Common medium optical multichannel exchange and switching system

Abstract: In the disclosed common medium multichannel exchange and switching system, optical carrier frequencies and bandwidths are employed and provide switched channels of unprecedentedly large bandwidth. At the same time, the switching network at optical frequencies is of such unprecedentedly small size that it promises to be implementable via integrated optics on only one integrated circuit chip, or, at most, a few chips of suitable material. The system is adapted to optical frequencies in that the common medium is an optical strip guide and optical directional channel-separation filters are employed to couple a plurality of switched customers or switched facilities on to or off of the common medium. At the same time, the system is compatible with the central processing control of the general type employed in current electronic switching systems. In one embodiment, some of the directional channel-separation filters are tunable over the entire bandwidth of the system without compromising the small size of the integrated optics network by employing a variable diffraction-grating effect induced by an acoustic wave. A second embodiment provides distributed switching employing a looped common medium.