Thermal stability and spectroscopic properties of erbium-doped niobic-tungsten-tellurite glasses for laser and amplifier devices

► Thermal and optical properties of Er3+ doped niobic-tungsten-tellurite glasses. ► Spectroscopic properties measured when pumped by commercial telecom 980 nm LD. ► Investigation of the effect of Er3+doping level on glass properties. ► Present glass is a good candidate for efficient 1.5 μm compact fiber amplifier or laser.