Method and deposition burner for manufacturing optical fibre preforms

摘要

Method and burner for increasing the deposition rate of porous glass deposit in the manufacture of optical preforms, by modifying the cross-sectional shape of the flow of glass particles impacting onto a target preform. In particular, the cross-section of said flow of glass particles is modified by increasing the dimension of said flow from a circular cross-section to one having a major and minor axis in a direction substantially perpendicular to the longitudinal axis of said target preform.