C - Chemistry – Metallurgy – 03 – B
Patent
C - Chemistry, Metallurgy
03
B
49/77, 117/85, 4
C03B 37/018 (2006.01) C03B 37/027 (2006.01) C03C 13/04 (2006.01) C03C 17/245 (2006.01) C03C 23/00 (2006.01)
Patent
CA 2004806
Silica intended to form the core of an optical-fibre preform is deposited as an unvitrified soot inside a reaction tube, and a non-aqueous solution of one or more dopant precursor is then introduced into the tube without removing the tube from the apparatus. A first precursor may be for a dopant such as alumina to raise the refractive index of the layers formed by vitrification of the soot, and a second precursor for a dopant such as rare earth to improve the transmission properties of the preform material. The solution may be introduced and removed either through branches on the tube, or by filling the tube, in each case without removing it from the lathe used to rotate the tube during deposition and vitrification.
Cognolato Livio
Gnazzo Angelantonio
Ridout & Maybee Llp
Telecom Italia S.p.a.
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