Method of fabricating multi-mode optical fiber preforms

Details Method of fabricating multi-mode optical fiber preforms Method of fabricating multi-mode optical fiber preforms

1980-09-19

1983-01-04

Fisher, Richard V.

Glass manufacturing

Processes

With shaping of particulate material and subsequent fusing...

65 312, C03B 1906, C03B 3707

Patent

active

043670857

ABSTRACT:
A method of fabricating an optical fiber preform wherein a synthesizing torch is inclined between 10.degree. and 60.degree. 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 at 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 fluctuations are small, and the preform is formed stably without formation of cracking on the periphery of the preform.

REFERENCES:
patent: 4062665 (1977-12-01), Izawa et al.
patent: 4259101 (1981-03-01), Tsukuda et al.
Sudo et al., "Low OH-Content Optical Fiber . . . ", Electronic Letters, vol. 14, No. 17, Aug. 17, 1978, pp. 534-535.
Izawa et al., "Continuous Fabrication Process for High-Silica Fiber Preforms", The Transactions of the IECE of Japan, vol. E 62, No. 11, Nov. 1979, pp. 779-785.

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