Method and apparatus for manufacturing a glass optical fibre preform by the outside vapour deposition process

摘要

A process and apparatus for manufacturing a glass optical fiber preform by an outside vapour deposition (OVD) process using a linear array of deposition burners is disclosed. The process and apparatus further comprises: a first burner-moving-unit (96) that moves the deposition burner away (62,64,66,68,70) in a direction parallel with a longitudinal direction of the preform rod (38); and a second burner-moving-unit (98) that moves said first burner-moving-unit (96) in a same moving direction of said first burner-moving-unit (96). The purpose of the process and apparatus disclosed is to evenly disperse the deposit along the whole length of the preform to provide a porous soot preform of constant outside diameter, particularly at the turning points of the deposition burner at the tapered ends of the preform deposit on the start rod.