Laser-diode pumping (1.4 and 1.56 [micro sign]m) of gain-shifted thulium-doped fibre amplifier

The authors have developed a novel laser-diode pumping scheme (1.4 and 1.56 µm) for a thulium-doped fibre amplifier operating in the 1475 to 1502 nm wavelength band. They report a small-signal gain > 25 dB, a noise figure < 7 dB, an optical-to-optical efficiency of 10.3%, and a total output power of +17.1 dBm.