Slow light generation in singlemode Er-doped tellurite fibre

The efficient generation of slow light in a singlemode Er-doped tellurite glass fibre, which has a Brillouin gain coefficient about an order of magnitude larger than silica fibre is reported. Pulses of 60 ns width were delayed by 67 ns in a 2 m length of fibre with a pump power of 630 mW. The large Brillouin gain and relatively low loss of tellurite fibre should be useful in the realisation of compact slow light devices operable at a lower pump power.