Abstract
We propose and demonstrate a gain-shifted thulium-doped fiber amplifier (TDFA) by using a novel dual-wavelength pumping scheme for what we believe is the first time. By providing a small amount of power to a conventional upconversion-pumped TDFA, we successfully demonstrated a small-signal gain larger than 25 dB and a noise figure of 5 dB in a 1475–1510-nm band.
© 1999 Optical Society of America
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