Optical fibre: principle, construction,working, types and ...
16/11/2019 · The glass rod is then gradually cooled from 1400°C to room temperature to form a preformed glass rod having different inner and outer glass compositions. Step – 2: The performed glass rod is then heated in a fibre drawing furnace. The end of the rod is pulled at a constant rate to form a thin fibre containing the core and the cladding.