Anti-Stokes luminescence in bismuth-doped high-germania core fibres

This paper presents a study of anti-Stokes luminescence in optical fibres with a bismuth-doped ~50%GeO₂ – 50%SiO₂ glass core under IR excitation. The anti-Stokes luminescence intensity has been measured as a function of temperature in the range 77–300 K. From these data, we have evaluated the activation energy for the thermal quenching of anti-Stokes luminescence in the visible and IR spectral regions. A mechanism of anti-Stokes luminescence in this type of optical fibre has been proposed.