We demonstrate the suitability of GeO 2 for fibre engineering by compositional modifications of core and cladding glasses using the rod-in-tube technique, which have been matched for fibre drawing. The methods adopted for identifying the core-clad combination (56GeO 2-31PbO-9Na 2O-4Ga 2O 3 and 55GeO 2-30PbO-11Na 2O-4Ga 2O 3) are explained, based on the thermal, viscosity, and optical properties. We specially point out to the relatively high transformation temperature range ( Tg > 380 °C) of the glass, which is suitable for chemical sensing and metrological applications in the 150-200 °C. The total intrinsic loss is compared with the measured loss in multi- and single-mode fibres from 0.532 to 2.02 μm, with loss less than 2.5 dB m -1 in the 1000-1600 nm range. The origin of larger loss outside this region is explained.