Enhanced gain bandwidth of Tm3+ and Er3+ doped tellurite glasses for broadband optical amplifier

In this work, (90-x-y)TeO2-10GeO2-(x)Tm2O3-(y)Er2O3 composition of germano-tellurite glasses were synthesized by traditional melting and quenching technique and the spectroscopic properties of synthesized glasses were investigated. The values of Judd-Ofelt (JO) intensity parameters (Ωt(t = 2, 4, 6)), spontaneous transition probabilities (Α), branching ratios (β) and radiative lifetimes (τR) were obtained by using the Judd-Ofelt (JO) theory and absorption spectra. The stimulated emission cross-sections of TG:Tm and TG:Er glasses in 1.47 μm and 1.53 μm wavelength regions were calculated by Fuchtbauer-Ladenburg formula and McCumber theory, respectively. The gain bandwidth-cross section product of TGTm0.5 and TGEr1 glasses was found to be 445.76 × 10−28 cm3 and 849 × 10−28 cm3, respectively. The fluorescence lifetime measurements were done for the 3F4 and 4I13/2 levels to compare with the radiative lifetimes. These results suggest that the TG:Tm and TG:Er studied glasses can potentially possess wider gain bandwidth for S-band amplifier and broadband optical amplifier WDM at 1.53 μm, respectively.