T. Kasamatsu et al., 1.50-mu m-band gain-shifted thulium-doped fiber amplifier with 1.05-and 1.56-mu m dual-wavelength pumping, OPTICS LETT, 24(23), 1999, pp. 1684-1686
We propose and demonstrate a 1.50-mu m-band gain-shifted thulium-doped fibe
r amplifier (TDFA) by using a novel dual-wavelength (1.05 and 1.56-mu m) pu
mping scheme for what we believe is the first time. By providing a small am
ount of 1.56-mu m power to a conventional upconversion-pumped TDFA, we succ
essfully demonstrated a small-signal gain larger than 25 dB and a noise fig
ure of 5 dB in a 1475-1510-nm band. (C) 1999 Optical Society of America.