C - Chemistry – Metallurgy – 03 – B
Patent
C - Chemistry, Metallurgy
03
B
117/85
C03B 37/00 (2006.01) C03B 37/014 (2006.01)
Patent
CA 1164737
ABSTRACT OF THE DISCLOSURE In fabricating an optical fiber preform, a synthesizing torch is inclined by 10° to 60° with respect to the rotation axis of a seed rod. Moving the rod while rotating it, a glass raw material gas and a flame forming gas are blown out individually from the torch to synthesize glass particles which are deposited onto one end of the rod, so that a cylindrical porous preform is grown in the direction of the rotation axis of the rod. Then the porous preform is heated at a high temperature to vitrify the porous preform into a transparent optical fiber preform. At least one exhaust port is disposed with a distance of 1 mm to 50 mm from the periphery of the porous preform and in the vicinity of the growing surface of the porous preform. In fabricating the porous preform the outer diameter fluctuation is small, and the preform is formed stably without formation of crack on the periphery of the preform. The growing speed is improved easily.
360818
Edahiro Takao
Hanawa Fumiaki
Kawachi Masao
Nakahara Motohiro
Suto Shoichi
Gowling Lafleur Henderson Llp
Nippon Telegraph & Telephone Public Corporation
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