Nearly 10 dB net gain from a thulium-doped tellurite fibre amplifier over the S-band

For the first time a net S-band gain of 8 dB, corresponding to a pump-on/pump-off gain of 32 dB, is reported for a Thulium-doped Tellurite amplifier. Advantages with respect to known Fluoride-based fibres are a broader gain spectrum and a fabrication process common to hosts suitable for broadband Erbium operation.