By integrating the Plasma Solid-state Outside Deposition（PSOD）

fibre preform fabrication and fibre drawing technologies

we have successfully developed a new preform fabrication process

in which relatively low cost natural quartz sand is used as raw material

plasmas as heat source and drying compressed air as working gas.Using this process

we prepare cladding cylinders that conform to the requirements for fibre production and devise an appropriate technological process for fibre production.This process is simple

needs no dehydration or sintering in the synthetic cylinder process

produces no toxic or harmful gas and so will not pollute the environment.On the basis of our experience in fibre drawing and the special property of nature quartz sand material

we devise the low doping preform deposition technology and the process conditions for high tension drawing.Our fibre products are fully qualified and their attenuation level is low.