Glass manufacturing – Processes – Forming product or preform from molten glass
Patent
1978-08-11
1980-09-23
Fisher, Richard V.
Glass manufacturing
Processes
Forming product or preform from molten glass
65 18, 65 2, C03B 1906, C03B 37075
Patent
active
042240468
ABSTRACT:
Two gaseous raw glass materials containing dopants to provide different refractive indices and borne by an argon carrier are jetted from the central or inner and first concentric nozzles 11, 12 of a five tip burner 1; an argon shield is supplied through the second concentric nozzle 13, and hydrogen and oxygen are supplied through the third and fourth concentric nozzles 14, 15, respectively. Soot-like glass particles 4 are formed by flame hydrolysis and deposited on the lower end of a start rod 3 which is gradually rotated and withdrawn to thus grow a cylindrical preform 2. The intermixing of the particles formed from the two glass materials produces a preform having a substantially parabolic radial index of refraction distribution, which characteristic is retained in an optical communication fiber formed by sintering and drawing the preform.
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Izawa Tatsuo
Kameo Yuji
Kuwabara Toru
Masuda Yuichi
Fisher Richard V.
Nippon Telegraph and Telephone Public Corporation
Sumitomo Electric Industries Ltd.
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