Method of and apparatus for reducing volume and surface defects in silica optical-fibres.

摘要

The method allows surface defect reduction in silica optical-fibres (2) by enriching the external layer by silica bonded carbon atoms within the silica network: SiC·SiO2. Carbon is obtained from chemical reaction directly during the drawing step. Volume defects are reduced by rapidly cooling the fibre structure heated up to vitrous transition temperature. The apparatus allows the method to be carried out during drawing step.