T. Kasamatsu et al., Gain-shifted dual-wavelength-pumped thulium-doped fiber amplifier for WDM signals in the 1.48-1.51-mu m wavelength region, IEEE PHOTON, 13(1), 2001, pp. 31-33
We constructed a gain-shifted dual-wavelength-pumped (1.05/1.56 mum) thuliu
m-doped fiber amplifier (TDFA) for wavelength-division-multiplexing (WDM) s
ignals in the 1.48-1.51-mum wavelength region, We obtained a gain of larger
than 20 dB and a noise figure of less than 7 dB in the range from 1478 to
1505 nm, Amplifier saturated output power was +20.1 dBm with an optical-to-
optical conversion efficiency of 9.1% for 12-channel WDM signals. We also o
btained a successful bit error rate performance for signals modulated at 10
Gb/s when the gain-shifted TDFA was used in an optical preamplifier config
uration. These results confirm the feasibility of using the gain-shifted TD
FA as both a booster and an optical preamplifier in WDM networks.