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Limiting repeater separation of digital and optical transmission systems at high bit rates

: Baack, C.

Nachrichtentechnische Zeitschrift : NTZ 30 (1977), Nr.1, S.65
ISSN: 0027-707X
Fraunhofer HHI ()
digital communication systems; optical communication equipment; repeaters; digital; optical transmission systems; high bit rates; repeater separation limitation

The optical channel consists of lasers, glass fibres, avalanche photo-diodes, pre-amplifiers, etc; it is assumed that the light signal on entry to the fibre approximates to independent square impulses, that the transmission characteristics of the fibres are approximately those of a Gaussian low-pass filter, and that the transmission property of the receiver is Gaussian. At 1 Gbit/s, it is calculated that for very wide band filter fibres, without quantised feed-back, the binary transmission signal is the optimum. For narrow band fibres, this and the multi-step system are equivalent in performance.