C - Chemistry – Metallurgy – 03 – C
Patent
C - Chemistry, Metallurgy
03
C
49/77, 117/85, 4
C03C 17/02 (2006.01) C03B 37/014 (2006.01) G02B 6/028 (2006.01)
Patent
CA 1104825
S-2-20073M/HK/78 ABSTRACT OF THE DISCLOSURE 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; and 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, respec- tively. Soot-like glass particles 4 are formed by flame hydro- lysis and deposited on the lower end of a start rod 3 which is gradually rotated and withdrawn to thus grow a cylindrical pre- form 2. The intermixing of the particles formed from the two glass materials produces a preform having a substantially para- bolic radial index of refraction distribution, which character- istic is retained in an optical communication fiber formed by sintering and drawing the preform.
309090
Izawa Tatsuo
Kameo Yuji
Kuwabara Toru
Masuda Yuichi
George H. Riches And Associates
Nippon Telegraph And Telephone Public Corporation
Sumitomo Electric Industries Ltd.
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