Optical amplifier using optical circulator and fiber amplifier
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United States of America Patent
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Oct 13, 1998
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N/A
app pub date -
Dec 16, 1996
filing date -
Feb 24, 1995
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Abstract
An optical amplifier achieves multistage amplification with a four port optical circulator with fiber amplifiers and Faraday rotators and mirrors connected to at least two of the ports. The fiber amplifiers permit the signal to pass through the fiber amplifiers twice.
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