Method of manufacturing a high mechanical strength optical fiber

Details Method of manufacturing a high mechanical strength optical fiber Method of manufacturing a high mechanical strength optical fiber

1988-12-09

1989-10-17

Lindsay, Robert L.

Glass manufacturing

Processes

Forming product or preform from molten glass

65 34, 65 1213, C03B 37027, C03C 2502

Patent

active

048744158

ABSTRACT:
An optical fiber (F) is pulled by a capstan (6) from a silica preform (1) whose bottom end (20) is softened in an oven (2). After cooling, said fiber is coated with an organic protective coating by means of a coating device (4). According to the invention, the surface of the fiber is reheated under tension by means of a torch (14) upstream from the covering device. Tension stresses in the softened surface layer are therefore relaxed. Cooling, followed by the fiber-drawing tension being removed after the capstan (6) cause said surface layer to be put under permanent compression, thereby reducing the risk of the fiber breaking. The invention is applicable to manufacturing fibers having improved characteristics.

REFERENCES:
patent: 3697241 (1972-10-01), Strickland et al.
patent: 3881902 (1975-05-01), De Luca
patent: 4249925 (1981-02-01), Kawashima et al.
patent: 4304582 (1981-12-01), Aussenegg et al.
patent: 4396409 (1983-08-01), Bailey et al.
patent: 4504300 (1985-03-01), Gauthier et al.
Patent Abstracts of Japan, vol. 10, No. 36 (C-328)[2093], 13 Fevrier 1986; & JP-A-60 186 430 (Nippon Denshin Denwa Kosha) 21-09-1985.
Patent Abstracts of Japan, vol. 8, No. 71 (C-217)[1508], 3 Avril 1984; & JP-A-58 223 636 (Nippon Denshin Denwa Kosha) 26-12-1983.
Patent Abstracts of Japan, vol. 6, No. 231 (C-135)[1109], 17 Nov. 1982; & JP-A-57 135 739 (Nippon Denshin Denwa Kosha) 21-08-1982.

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