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US 7,299,659 B2Granted
Method for manufacturing optical fiber preforms
AssigneePrysmian Cavi E Sistemi Energia S.R.L.
InventorsGiacomo Stefano Roba, Massimo Nutini
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Abstract
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 the flow of glass particles is modified by increasing the dimension of the flow from a circular cross-section to one having a major and minor axis in a direction substantially perpendicular to the longitudinal axis of the target preform.
Claims10
A method for producing an optical preform which comprises:
- (a) feeding a flow of glass precursor material into a deposition burner and conferring to said flow a substantially circular cross-section;
- (b) feeding a flow of combustible gas and a flow of combustion sustaining gas into said burner, in order to create a flame for uniformly heating said flow of glass precursor material and causing said glass precursor material to react, thereby forming a flow of fine glass particles;
- (c) directing said flow of fine glass particles and said flame toward a target preform having an initial diameter;
- and
- (d) causing said flow of glass particles to impact onto said target preform, thus increasing the radial dimensions of said preform up to a final diameter;
- wherein the cross-section of at least the terminal portion of said flow impacting onto the target preform is modified into a cross-sectional shape having a major axis and a minor axis, said major axis being substantially orthogonal to the longitudinal axis of the target preform.
3 more elements
Dependencies are inferred from the claim text.