Method of manufacturing optical fibers with elimination of parax

Details Method of manufacturing optical fibers with elimination of parax Method of manufacturing optical fibers with elimination of parax

1985-06-13

1990-05-01

Schor, Kenneth M.

Glass manufacturing

Processes

Forming product or preform from molten glass

65 182, 65 29, C03B 37018

Patent

active

049215167

ABSTRACT:
In producing a preform for an optical fiber by MCVD technology, involving the buildup of a core matrix of doped silica layers inside a glass tube with subsequent thermal collapse of the structure, a layer of dopant is deposited on the inner surface of the finished core matrix before the collapse. The thickness of this dopant layer, which advantageously is in a colloidal state, progressively diminishes along the tube axis in a direction away from an end of the tube at which the collapse begins. The law of thickness variation is chosen to maintain an internal gas pressure of vaporized dopant equal to the vapor pressure of the dopant in the core material at the collapsing temperature, in order to prevent the appearance of a paraxial dip in the refractive-index profile of an optical fiber subsequently drawn from the collapsed preform.

REFERENCES:
patent: 3961926 (1976-06-01), Asam
patent: 4304581 (1981-12-01), Saifi
patent: 4341441 (1982-07-01), Lighty et al.
patent: 4389230 (1983-06-01), Modone et al.
Akamatsu et al., "Fabrication of Graded-Index Fibers Without an Index Dip by CVD Method", Applied Physics Letters, vol. 31, No. 8, Oct. 15, 1977, pp. 515-517.
Wood et al., "Chemistry of the MCVD Process for Making Optical Fibers: 7th European Conference on Optical Communication", pp. 1.2-1-1.2-4, 9/81.

Affiliated with

Also associated with

Rating

Method of manufacturing optical fibers with elimination of parax does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Method of manufacturing optical fibers with elimination of parax, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method of manufacturing optical fibers with elimination of parax will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-827218