Optical amplification at 0.54 µm by Tb 3+ -doped fluoride fibre

0.54 µm band amplification using Tb3+-doped fluoride fibre is demonstrated. Spectroscopic properties of Tb3+-doped fluoride glass are clarified. A gain of 5.3 dB has been obtained in a 1 wt.% Tb3+-doped fluoride fibre for a signal power of −30 dBm by forward pumping at a wavelength of 0.488 µm with power of 100 mW.