Fibre-optic communications-transmission method and intermediate repeater for use in the method
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United States of America Patent
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Dec 1, 1998
Grant Date -
N/A
app pub date -
Mar 4, 1996
filing date -
Sep 30, 1993
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The invention relates to an optical communication-transmitting system for transmitting at least one useful signal with a high bit rate, which has intermediate repeaters (ZV.sub.1 -ZV.sub.n) with optical fiber amplifiers (OV.sub.ss, OV.sub.1 -OV.sub.n, OV.sub.es) and which uses at least one additional signal of a low bit rate, for example for monitoring the intermediate repeater. For a transmission system requiring small outlay, the additional signal is transmitted on a wide band in comparison to the useful signal, for example by means of luminescence diodes (S.sub.ss, S.sub.1 -S.sub.n) and is amplified by the fiber amplifiers (OV.sub.ss, OV.sub.1 -OV.sub.n, OV.sub.es) in the same manner as the useful signal. For transmitting and receiving the additional signal, a transmitter (S.sub.1) is preferably disposed in an intermediate receiver (ZV.sub.1) upstream of the fiber amplifier (OV.sub.1) and a receiver preferably downstream thereof. The additional signal is transmitted in time-division multiplex in a frame, which assigns each intermediate repeater its own time slot. The narrow-band and the wide-band signals can be separated with simple means from each other in receivers (E.sub.1 -E.sub.n, E.sub.es, EA).
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