Patent ID: 8181488
Filing Date: 2012-05-22
Classification: C03B,Y02P

Abstract:
1. A method for overcladding an optical fiber preform having a given, final preform target diameter (D 0 ), the method comprising the steps of: providing a primary preform to be overcladded; successively depositing first overcladding layers by projecting and vitrifying silica particles on the primary preform in relative translation with a plasma torch, each first overcladding layer having a given, substantially constant thickness (d) and, over the entire duration of its deposition along the length of the primary preform, each first overcladding layer being deposited at a given, substantially constant silica particle flow rate (Fx) and at a given, substantially constant translation speed (V), and wherein each first overcladding layer's silica particles are vitrified before the projection and vitrification of the next successive first overcladding layer; detecting a preform diameter (D depositing a last overcladding layer having the remaining required thickness (D