Process for the production of optical fiber preforms

Details Process for the production of optical fiber preforms Process for the production of optical fiber preforms

1985-07-19

1989-01-10

Kellogg, Arthur

Glass manufacturing

Processes

Forming product or preform from molten glass

65 311, 65 13, 65 182, C03B 37018

Patent

active

047971436

ABSTRACT:
An improved process for the production of optical fiber porous preforms of predetermined refractive index distribution by the vapor-phase deposition method is disclosed wherein a glass material and a dopant material are subjected to flame oxidation by the use of an oxyhydrogen burner to form fine glass particles which are deposited on one end of a supporting rod adapted to move apart from the oxyhydrogen burner while rotating to allow a rod-like porous preform to grow thereon. The improved process is characterized in that the correlation between the shape of the deposition face and the refractive index distribution is previously determined mathematically, and on a basis of the correlation therebetween, a process variable such as the distance between the porous preform and the burner is adjusted to produce the desired shape of the deposition face whereby there can be obtained an optimum refractive index distribution.

REFERENCES:
patent: 4062665 (1977-12-01), Izawa et al.
patent: 4378985 (1983-04-01), Powers
patent: 4419116 (1983-12-01), Nakahar et al.
Sudo et al. "Transactions of the IECE of Japan" vol. 64, No. 8, Aug. 81, pp. 532-543.

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