Double core, active fiber optical amplifier having a wide band signal wavelength
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United States of America Patent
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Jun 8, 1993
Issued Date -
N/A
app pub date -
Sep 30, 1992
filing date -
Feb 7, 1990
priority date (Note) -
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Abstract
An optical amplifier for telecommunication lines over which communication signals at a predetermined wavelength are transmitted. The amplifier has portions of two optically coupled fibers, at least one of the fibers being an active fiber, interconnected by a length of active fiber connected to the one fiber of successive portions. Preferably, the active fibers are doped with erbium, and the coupling wavelength of the two fibers is different from the communication signal wavelength so that energy of the spontaneous emission of erbium is transferred from the one fiber to the other fiber and absorbed in the latter permitting amplification of communication signals in a range of wavelengths corresponding to the tolerance range of commercial laser signal emitters.
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