Method of making optical fiber with low melting glass core

Details Method of making optical fiber with low melting glass core Method of making optical fiber with low melting glass core

1995-08-31

1997-03-11

Hoffmann, John

Glass manufacturing

Processes of manufacturing fibers, filaments, or preforms

With measuring, controlling, sensing, programming, timing,...

65389, 65401, 65404, 65 45, C03B 37012

Patent

active

056096658

ABSTRACT:
The disclosed method of making a mixed glass optical fiber exemplarily comprises providing a high-silica tube, and causing molten non-high silica glass to flow into the bore of the tube by application of a pressure differential. In order to prevent cracking, the tube desirably has an outer diameter/inner diameter ratio of at least 5, preferably about 10 or even more, and an inner diameter of at most 1 min. In a preferred embodiment, a conventional SiO.sub.2 tube is partially collapsed to an inner diameter less than 1 mm, a quantity of a non-high-silica glass is placed in a neck of the partially collapsed tube and heated such that molten glass communicates with the reduced-diameter portion of the bore and can be drawn into the reduced-diameter portion by means of a vacuum. The resulting mixed glass body is then further stretched to result in a core rod of core diameter at most 0.3 min. After overcladding the core rod with SiO.sub.2, fiber is drawn from the thus produced preform. A thus produced fiber with SiO.sub.2 cladding and SiO.sub.2 -Al.sub.2 O.sub.3 -La.sub.2 O.sub.3 -Er.sub.2 O.sub.3 core was used as an optical fiber amplifier and provided high gain.

REFERENCES:
patent: 4063914 (1977-12-01), Roeder
patent: 4277270 (1981-07-01), Krohn
patent: 4682995 (1987-07-01), Clasen
patent: 5106400 (1992-04-01), Tick
patent: 5160521 (1992-11-01), Tran

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