Original research articleSystematical study of up-conversion and near infrared emission of Bi/Er co-doped optical fibre pumped at 830Â nm

We investigated the spectroscopic properties of bismuth/erbium co-doped optical fibre (BEDF) under 830 nm pumping and observed considerable up-conversion in blue along with the typical near infrared (NIR) emission. The influence of pump power and fibre length upon both up-conversion and NIR emission has been studied and analyzed in details. Amplified spontaneous emission (ASE) at 1420 nm has been observed in BEDF by 830 nm pumping. The results demonstrate that the up-conversion has effect upon the emission at 1420 nm. The relationship between the pump absorption and emission has also been discussed to illuminate the possible energy transition processes in BEDF.