Numerical investigation of emission properties of a quadruply-doped germanate glass

In this paper, we numerically investigated the emission and gain properties of an Yb3+:Er3+:Tm3+:Ho3+ co- doped germanate glass. We optimized the relative rare-earth concentrations to achieve homogeneous and efficient emission over 650 nm by merging the emission bands of erbium at 1550 nm, thulium at 1800 nm, and holmium at 2050 nm. Then, we carried out a preliminary investigation of its potential as a fiber amplifier, achieving a theoretical gain higher than 14 dB over a 280-nm-band