Feedback-type optical fiber amplifier using hybrid pumping light beams
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United States of America Patent
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May 16, 2000
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N/A
app pub date -
Dec 29, 1997
filing date -
Dec 31, 1996
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Expired
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Abstract
A feedback-type optical fiber amplifier using hybrid pumping light beams disclosed, including: an optical line through which an optical signal is propagated; a plurality of rare-earth-doped fibers, doped with a predetermined rare earth ion, being coupled to the optical line in series; a plurality of pumping light sources for outputting pumping light beams having wavelengths different from each other; a plurality of optical coupling means for coupling the pumping light beams to the optical line; and feedback means for dividing the pumping light beam outputted through at least one of the rare-earth-doped fibers, and looping it back to corresponding rare-earth-doped fiber as its input. Therefore, the length of fiber constructing the optical fiber amplifier is reduced, and the amplification efficiency is improved.
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