Cathode-luminescence property of Er3+/Yb3+-doped amorphous GeO2

Luminescence property of erbium (Er)-doped GeO2 has been studied with cathode-luminescence analysis. GeO2 material has exhibited strong luminescence at wavelength 1537 nm compared to Er-doped SiOx. By co-doping with ytterbium (Yb), luminescence increased with Er concentration 0.2-0.4 mol%. On the other hand, in higher Er concentration, energy could not be transferred between Er and Yb effectively. The fabrication of a single mode channel waveguide could not be achieved using our GeO2 as the host material. This is probably due to the cracks generated in the film resulting from thermal annealing and wet process.