| 摘要 |
<p>Method for overcladding an optical fibre preform with a given target diameter (D 0 ) of the final preform comprises providing a primary preform to be overcladded, and successively depositing first overcladding layers by projecting and vitrifying silica particles on the primary preform moving in relative translation with a plasma torch. Each first overcladding layer has a given constant thickness (d) and is deposited at a given, constant silica particle flow rate and at a given, constant translation speed. The method also comprises the detection of a preform diameter (D 1 ) greater than a given threshold (S) and the depositing of a last overcladding layer having the remaining required thickness (D 0 -D 1 ) at a silica particle flow rate maintained constant and at a reduced translation speed. The inventive method enables a preform to be overcladded efficiently with improved yield and high quality.</p> |
