Glass manufacturing – Processes – Forming product or preform from molten glass
Patent
1978-10-06
1980-04-22
Bashore, S. Leon
Glass manufacturing
Processes
Forming product or preform from molten glass
65 31, C03C 2502, C03C 1500
Patent
active
041993373
ABSTRACT:
A process is disclosed for finishing high-strength multilayer optical preforms capable of being drawn into long optical fibers useful for light-wave communications. The preforms are of the type prepared by sequential chemical-vapor-deposition of the various desired glass layers within a tubular glass substrate that is then collapsed into a solid cylindrical preform comprising a cylindrical light-transmitting core surrounded by a concentric cladding layer and one or more additional layers within the collapsed substrate. In order for the outermost deposited additional layer to constitute a thin high-compression layer on the surface of the completed optical structure, it is necessary first to remove substantially all of the substrate layer from the preform in such a manner as to leave the adjoining high-compression layer intact. This is accomplished by selecting a glass for the substrate layer that is capable of being etched away faster than the high-compression layer, and then using controlled preferential etching to remove the substrate layer without penetrating or damaging the high-compression layer.
This method makes it possible to provide a thinner and more effective outer high-compression layer, on the surface of the completed preform, which is of uniform radial thickness regardless of any nonlinearity or non-concentricity of the core, enclosing layers, or substrate layer. An optical fiber drawn from the completed preform will then retain a uniform high-compressive stress in its outer layer that contributes materially to its tensile strength, durability, and fiber life.
REFERENCES:
patent: 3864111 (1975-02-01), Kemp
patent: 3975175 (1976-08-01), Foster et al.
patent: 3982916 (1976-09-01), Miller
patent: 3982917 (1976-09-01), Upton
patent: 4009014 (1977-02-01), Black et al.
patent: 4102664 (1978-07-01), Dumbaugh, Jr.
patent: 4116653 (1978-09-01), Irven
Journal American Ceramic Society, by Krohn, Sep. 1970, pp. 505-504.
Journal American Ceramic Society, by Paek and Kurkjian, Aug. 1975, pp. 330-335.
Bashore S. Leon
International Telephone and Telegraph Corporation
Miga Frank W.
O'Halloran John T.
Van Der Sluys Peter C.
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