Glass manufacturing – Processes of manufacturing fibers – filaments – or preforms – Process of manufacturing optical fibers – waveguides – or...
Patent
1993-04-13
1994-11-22
Lindsay, Robert L.
Glass manufacturing
Processes of manufacturing fibers, filaments, or preforms
Process of manufacturing optical fibers, waveguides, or...
65 174, 65510, 65531, C03B 37075
Patent
active
053665309
ABSTRACT:
The invention concerns the method and apparatus to fabricate an oval cross-sectional optical waveguide which only allows light to propagate in one direction of polarization. The optical waveguide preform for such an optical waveguide according to the modified chemical vapor deposition (MCVD) process is produced in such a way, that cooling is used to provide the substrate tube with an oval or elliptical temperature cooling profile. The apparatus for carrying out the fabrication method includes a cooling device (5) mounted to a support (3) beside a gas burner (4) and consists of two nozzles (10) directed toward the substrate tube (2) so as to direct cooling gas toward the substrate tube as glass layers are deposited thereon to produce core and cladding of the optical waveguide. The nozzles rotate synchronously with the substrate tube.
REFERENCES:
patent: 3982916 (1976-09-01), Miller
patent: 4184859 (1980-01-01), Maklad
patent: 4331462 (1982-05-01), Fleming et al.
patent: 4405655 (1983-09-01), Tuin
Essay: "Production of preforms for optical fibers", vol. 62, No. 3/4, Electrical Communications of 1988 Technical Journal Published Quarterly by Alcatel NV 1988 pp. 235-241.
Alcatel N.V.
Lindsay Robert L.
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