Optical fiber telecommunication line including amplifiers distributed along the line for the transmitted signals
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United States of America Patent
Stats
-
Oct 8, 1991
Grant Date -
N/A
app pub date -
Jul 20, 1990
filing date -
Jul 21, 1989
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An optical fiber telecommunication line composed of a number of series connected optical cables arranged end-to-end includes an active core optical fiber amplifier for the transmitted signals between each adjacent pair of optical cables. Two pumping optical radiation sources are connected to each active core optical fiber within each of the amplifiers, one source for each end of a single active core optical fiber. One of these two sources is placed into service and the second one is kept in reserve to be placed into service if the first one fails. A microprocessing circuit causes the sources to send distinctive recognizable alarm signals indicative of the state of an associated amplifier to terminal stations at the ends of the line and to receive therefrom control signals to control and exchange the functions between the two sources as necessary.
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