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Coherent multicarrier techniques in future broadband communication networks

: Baack, C.; Bachus, E.-J.; Heydt, G.

Institute of Electrical and Electronics Engineers -IEEE-; Institution of Electrical Engineers -IEE-, London:
ECOC 87. 13th European Conference on Optical Communication. Technical Digest. Vol.3 : Helsinki, Finland, 13-17 Sept 1987
Helsinki, 1987
European Conference on Optical Communication (ECOC) <13, 1987, Helsinki>
Conference Paper
Fraunhofer HHI ()
broadband networks; carrier communication; light coherence; optical fibres; optical links; coherent multicarrier transmission; optical fibre transmission; broadband communication networks; laser wave; direct detection systems; optical preamplifiers; long distance transmission; multicarrier systems; coherent detection; subscriber loop; multicarrier switching

A multicarrier arrangement imposes certain requirements on the coherence of each laser wave in particular if a densely spaced (several GHz) carrier comb is assumed. In future there may be competition between direct detection systems with optical preamplifiers and single coherent systems for long distance transmission. Two questions have to be asked. Why multicarrier systems? Why coherent detection? The answers will differ, depending on the future evolution of components and system applications, which are examined briefly. Multicarrier transmission in the subscriber loop, multicarrier switching and problems related to multicarrier techniques are also discussed.