Patent ID: 6769275
Filing Date: 2004-08-03
Classification: C03B

Abstract:
A method for making an optical fiber preform, comprising steps of:(a) providing a tubular member having a center axis, a cylindrical void, an inner surface surrounding the void, and an outer surface, the inner surface and outer surface coaxial with one another about the center axis; (b) simultaneously depositing an outer silica soot layer on the outer surface and consolidating the outer silica soot layer into a vitreous silica layer and depositing an inner soot layer on the inner surface and consolidating the inner soot layer into a vitreous silica layer; (c) depositing a second outer silica soot layer on the outer surface of the previously deposited outer vitreous silica layer; (d) simultaneously depositing an outer silica soot layer on the outer surface of the second outer silica soot layer and consolidating said outer silica soot layer and said second outer soot layer into a vitreous silica layer and depositing an inner soot layer on the inner surface and consolidating the inner soot layer into a vitreous silica layer; and (e) repeating steps (c) and (d) until a predetermined thickness of said vitreous silica layers are formed.