Glass manufacturing – Processes of manufacturing fibers – filaments – or preforms – Process of manufacturing optical fibers – waveguides – or...
Patent
1994-08-02
2000-11-14
Hoffmann, John
Glass manufacturing
Processes of manufacturing fibers, filaments, or preforms
Process of manufacturing optical fibers, waveguides, or...
65414, 65415, 65 174, 65531, C03B 37018
Patent
active
061453447
ABSTRACT:
Proposed is an improvement in the VAD process for the preparation of a porous silica glass preform for double-core optical fibers by using three oxyhydrogen flame burners installed one above the other in a flame hydrolysis chamber in which a porous silica glass body consisting of the center core portion formed by the lowermost burner, side core portion formed by the middle burner and the cladding layer formed by the uppermost burner is gradually pulled up as it grows under rotation. Different from conventional procedures in which the extension of the nozzle axis of each of the burners intersects with the rotation axis of the growing body, the extension of the nozzle axis of the middle burner for the side core is displaced in a horizontal direction by a limited distance not to intersect nor to be in parallel with the rotation axis in the invention. By this means, an improvement is obtained in the uniformity of distribution of the refractive index in the side core which otherwise is remarkably disordered.
REFERENCES:
patent: 3741796 (1973-06-01), Walker
patent: 4378985 (1983-04-01), Powers
patent: 4676814 (1987-06-01), Ross
patent: 4726827 (1988-02-01), Powers
patent: 5028246 (1991-07-01), Sarkar
Hirasawa Hideo
Koide Hiroyuki
Ogino Goh
Oyamada Hiroshi
Hoffmann John
Shin-Etsu Chemical Co. , Ltd.
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