Fabrication method of single-mode optical fiber preforms

Details Fabrication method of single-mode optical fiber preforms Fabrication method of single-mode optical fiber preforms

1980-09-19

1982-08-24

Fisher, Richard V.

Glass manufacturing

Processes

With shaping of particulate material and subsequent fusing...

65 312, C03B 1906

Patent

active

043459285

ABSTRACT:
A method of fabricating a single-mode optical fiber preform wherein a core torch produces fine glass particles eccentrically with respect to the center area of a flame stream, the core torch being so arranged as to blow the flame stream at an angle inclined to a seed rod. The porous glass body forming the core is grown on one end of the rod and in the direction of the axis of the rod. A cladding layer is formed on the periphery of the porous glass core body by at least one torch for forming the cladding. The obtained porous glass body is heated and vitrified into a transparent glass body, which is sealed in a silica tube for jacketting to form a single-mode optical fiber preform. At least one exhaust port is disposed within a distance of 1 mm to 50 mm from the periphery of the porous glass body and in the vicinity of the growing surface of the glass body to exhaust residual glass fine particles and undesired gases. A porous glass body having a diameter of 20 mm or less is easily formed. Single-mode optical fiber having a cladding-to-core-diameter ratio of 3 or more is fabricated by the VAD method. Accordingly, a long-length and low-loss single-mode optical fiber is mass-produced.

REFERENCES:
patent: 4062665 (1977-12-01), Izawa et al.
patent: 4135901 (1979-01-01), Fujiwara et al.
patent: 4259101 (1981-03-01), Tsukuda et al.
Sudo et al., "Low-OH-Content Optical Fiber . . . "; Electronic Letters; Aug. 17, 1978, vol. 14, No. 17, pp. 534-534.
Izawa et al., "Continuous Fabrication Process for High-Silica Fiber Preforms", The Transactions of the IECE of Japan, Nov. 1979, vol. E62, No. 11, pp. 779-785.

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