Manufacture of optical fibers

Glass manufacturing – Processes – Forming product or preform from molten glass


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65 313, 65 32, 65 13, C03B 37075, C03C 2502




A method of inexpensively forming low-loss optical waveguide fibers having high strength. A draw blank comprising a core region surrounded by a thin layer of cladding glass is formed by a CVD technique. The blank is drawn into a preliminary fiber which passes through a double crucible arrangement whereby a tension layer is applied to the thin coating layer of the preliminary fiber and a compression layer is formed on the surface of the tension layer. The expansion coefficient of the tension layer is much greater than that of the core glass, and the expansion coefficient of the compression layer is lower than that of the tension layer.

patent: 4145200 (1979-03-01), Yamazaki et al.
patent: 4197136 (1980-04-01), Inoue et al.
patent: 4199337 (1980-04-01), Asam
patent: 4249925 (1981-02-01), Kawashima et al.


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