Low viscosity core glass optical fiber

Details Low viscosity core glass optical fiber Low viscosity core glass optical fiber

1981-05-26

1983-11-08

Lee, John D.

350 9631, G02B 5172

Patent

active

044138822

ABSTRACT:
Solid glass articles are made by the flame hydrolysis technique. A thin stratum of low viscosity glass soot is applied to the surface of a mandrel. First and second coatings of glass soot are deposited on the surface of the thin stratum to form a porous preform. The refractive index of the soot particles of the first coating is greater than that of the soot of the second coating, and the soot of the first coating has a viscosity lower than that of the second coating. The mandrel is removed, and the soot preform is subjected to a high temperature whereby it is consolidated to form a dense glass blank. The glass surface tension and the relative viscosities of the inner and outer portions of the preform cause the aperture to close during the consolidation process. The thin stratum, which preferably includes P.sub.2 O.sub.5, smoothes over the damage caused by removing the mandrel and reduces or even eliminates seed formation at the axis of the resultant glass blank. The blank is heated and drawn into an optical fiber.

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patent: 4339173 (1982-07-01), Aggarwal et al.
patent: 4339174 (1982-07-01), Levin
patent: 4344670 (1982-08-01), Blankenship
patent: 4358181 (1982-11-01), Gulati et al.
van Ass et al., Philips Tech. Rev., 36, 1976 (Jul.), No. 7, pp. 182-189, "The Manufacture of Glass Fibers For . . . ".
Presby et al., Bell System Tech. Journal, vol. 54, No. 10, Dec. 1975, pp. 1681-1692, "Material Structure of Germanium-Doped . . . ".
Payne et al., Optics Communications, vol. 13, No. 4, Apr. 1975, pp. 422-425, "A Borosilicate-Cladded Phosphosilicate-Core Optical . . . ".
Corning Glass Works, B-83, Mar. 1971, pp. 1-16, "Properties of Selected Commercial Glasses".

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