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Coherent optical communication

: Heydt, G.


Melchior, H. ; Institute of Electrical and Electronics Engineers -IEEE-; Institute of Electrical and Electronics Engineers -IEEE-, Switzerland Section:
Electronic Circuits and Systems for Communication : March 5 - 8, 1990, Zurich, Switzerland. Proceedings
Zürich: IEEE Switzerland, 1990
International Zurich Seminar on Digital Communications <11, 1990, Zürich>
Conference Paper
Fraunhofer HHI ()
broadband networks; carrier communication; digital communication systems; optical fibres; optical links; telecommunication services; coherent multicarrier techniques; coherent optical communication systems; public broadband networks; optical single-mode fiber; bandwidth; digital broadband services; long-distance transmission systems; optical amplifiers; optoelectronic repeaters; customer access systems; modulation; power budget; wavelength allocation; optical line outlet; optical interfaces; switching; transfer mode; optically transparent transport paths

Activities associated with the development of coherent optical communication systems for application in future public broadband networks are reviewed. It is pointed out that the main future transmission medium, the optical single-mode fiber, provides an extremely high bandwidth which will have to be utilized when high-capacity-demanding digital broadband services are introduced. Attention is given to long-distance transmission systems where coherent multicarrier (CMC) techniques can be used for multiple utilization of the optical fiber and where, by using optical amplifiers, a high number of optoelectronic repeaters can be replaced. Developments concerning CMC customer access systems are reviewed. Attention is given to carrier number considerations, modulation schemes, power budget considerations, wavelength allocation aspects, and the OLO (optical line outlet) concept for optical interfaces. Two approaches for the application of CMC techniques to switching are mentioned: the optoelectronic approach, which offers the possibility of introducing a CMC transfer mode, and an approach with optically transparent transport paths. Key components required for the implementation of the discussed CMC systems are mentioned.