Glass manufacturing – Processes – Forming product or preform from molten glass
Patent
1981-03-30
1982-11-23
Fisher, Richard V.
Glass manufacturing
Processes
Forming product or preform from molten glass
65 182, C03B 1900, C03B 37075
Patent
active
043603718
ABSTRACT:
A single mode optical waveguide is fabricated in a manner such that the core thereof is subjected to a stress-induced birefringence. A hollow intermediate product is formed by depositing layers of cladding and core glass on the inner surface of a substrate tube. Opposite sides of the intermediate product are heated to cause it to collapse into a solid preform foreproduct having an oblong cross-section. A layer of flame hydrolysis-produced soot having a circular outer surface is deposited on the preform foreproduct and is consolidated to form a dense glass cladding layer thereon. The TCE of the outer cladding layer is different from that of the preform foreproduct on which it is deposited so that when the resultant preform is drawn into a fiber, a stress-induced birefringence exists in the core.
REFERENCES:
patent: 4179189 (1979-12-01), Kaminow et al.
patent: 4184859 (1980-01-01), Maklad
patent: 4263031 (1981-04-01), Schultz
patent: 4274854 (1981-06-01), Pleibel et al.
Ramaswamy, et al., "Influence Of Noncircular Core . . ."; Electronics Letters, vol. 14, No. 5; Mar. 2, 1978; pp. 143-144.
Blankenship Michael G.
Keck Donald B.
Sarkar Arnab
Corning Glass Works
Fisher Richard V.
Simmons, Jr. William J.
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