Abstract
The gain spectra in Er3+ doped and Er3+/Ce3+ codoped tellurite glass fibres have been compared at 980 nm pump wavelength. The observed gain at 1.53 µm increased from 16 to 31 dB in a 12 cm long Er3+/Ce3+ codoped fibre, and the gain changed less than 2 dB with a 20 dB variation in signal power.
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