Preparation of germania cores in optical fibers

Details Preparation of germania cores in optical fibers Preparation of germania cores in optical fibers

1974-12-27

1976-06-08

Lindsay, Jr., Robert L.

Glass manufacturing

Processes

Forming product or preform from molten glass

65 30R, 65120, 427107, 427166, 427237, 65 3B, C03C 2502, C03C 1500

Patent

active

039619265

ABSTRACT:
A method for forming optical fibers reduces losses of germania dopant due to evaporation during chemical vapor deposition. After deposition of a high purity silica layer on the inner surface of a hollow silica tube, the tube is closed at one end and loaded with a small amount of crystalline germanium compound, such as germanium iodide. The other end is then also sealed and the tube is heated to vaporize the GeI.sub.4 and deposit a coating of germanium. This process may be repeated to build up the Ge layer. The tube is then broken open at both ends and the iodine vapor removed. The germanium layer is oxidized and heated to diffuse germania into the silica layer to provide a doped high index of refraction core layer on a lower index cladding layer. The tube and layers are then collapsed to form a preform which is later drawn into the optical fiber.

REFERENCES:
patent: 2272342 (1942-02-01), Hyde
patent: 3211583 (1965-10-01), Riley
patent: 3642521 (1972-02-01), Moltzan et al.
patent: 3644607 (1972-02-01), Roques et al.
patent: 3659915 (1972-05-01), Maurer et al.
patent: 3669693 (1972-06-01), Dalton et al.
patent: 3729335 (1973-04-01), Domrachev et al.
patent: 3884550 (1975-05-01), Maurer et al.

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