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Coherent optical techniques for broadband ISDN

: Baack, C.; Heydt, G.

Philosophical Transactions of the Royal Society of London. Series A 329 (1989), No.1603, pp.37-46
ISSN: 0080-4614
ISSN: 0962-8428
ISSN: 1364-503X
ISSN: 0264-3820
ISSN: 1471-2962
Journal Article
Fraunhofer HHI ()
broadband networks; ISDN; optical fibres; optical links; transmission capacity expansion; coherent multicarrier techniques; broadband ISDN; video-telephone; optical amplifiers; subscriber-line; optoelectronic converters; optoelectronic circuits; monolithic integration; single-mode fibre

When introducing broadband video-telephone on a large scale a considerable expansion of transmission capacity will be needed in the trunk network. This expansion might economically be achieved by the application of optical amplifiers and coherent multicarrier (CMC) techniques. When introducing the optical fibre in the subscriber-line area the distribution of television programmes is a crucial point. Broadband distribution applying CMC techniques might be a solution. Another obstacle against the introduction of optical fibres in the subscriber loop area is the high cost of optoelectronic converters. Unless optoelectronic circuits can be made less expensive by monolithic integration an extensive application of optical fibres in the subscriber loop area cannot be expected. The single-mode fibre is the suitable transmission medium for all network layers. When applying CMC techniques crosstalk can occur due to nonlinearities of the fibre. According to first experiences CMC techniques seem to be applicable not only for optical transmission but also for optical switching of information.