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Optical frequency multiplex technique: principles, applications, and potential


Nachrichtentechnische Zeitschrift : NTZ 46 (1993), Nr.1, S.16-18, 20-1
ISSN: 0027-707X
Fraunhofer HHI ()
frequency division multiplexing; multiplexing equipment; optical communication equipment; channel selection; optical frequency multiplexing; signal transmission capacity; flexible system structures; frequency shift modulated monomode semiconductor laser channels; stabilised frequencies; light wave conductors; laser local oscillator heterodyne frequency conversion; signal recovery; long distance signal transmission; broadband distribution systems; passive optical networks; optical frequency switching systems

The performance of optical communication systems can be considerably increased by optical frequency multiplexing, and the technique is suitable for the expansion of signal transmission capacity as well as for realisation of more flexible system structures. Principles of the technique in which outputs from frequency shift modulated monomode semiconductor laser channels operating at different stabilised frequencies are multiplexed for transmission by light wave conductors, are described. Channel selection and laser local oscillator heterodyne frequency conversion for signal recovery is effected at the receiving end. Applications and realisation are discussed for long distance signal transmission, broadband distribution systems, passive optical networks, and optical frequency switching systems.