Patent
1978-02-02
1980-06-10
Hille, Rolf G.
350 9634, G02B 514
Patent
active
042069688
ABSTRACT:
A method for producing an optical fiber comprises (i) the step of depositing a barrier layer on the inner wall surface of a glass tube by the CVD (chemical vapor deposition) process, said barrier layer being capable of preventing the diffusion of impurities and being made of high-silica glass which has a refractive index that is substantially equal to that of the glass tube and which contains at least one substance for lowering the refractive index of silica and at least one substance for raising the refractive index of silica, (ii) the step of depositing a glass film of desired refractive index on the barrier layer by the CVD process, (iii) the step of heating and collapsing the resultant glass tube into a composite rod or the so-called optical fiber preform, and (iv) the step of heating and drawing said optical fiber preform into the optical fiber, whereby the optical fiber which has the impurity diffusion-preventing layer between the core and the outside glass layer can be easily produced.
REFERENCES:
patent: 4114980 (1978-09-01), Asam et al.
patent: 4125388 (1978-11-01), Powers
P. W. Black, "Fabrication of Optical Fiber Waveguides," Electrical Communication, vol. 51, No. 1, pp. 4-11, 1976.
J. B. MacChesney et al., "Preparation of Low Loss Optical Fibers . . ", 10th International Congress on Glass 1974, 6-40 to 6-45.
Ishida Koji
Katsuyama Toshio
Satoh Shin
Suganuma Tsuneo
Sugie Mamoru
Hille Rolf G.
Hitachi , Ltd.
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