Glass manufacturing – Processes of manufacturing fibers – filaments – or preforms – Process of manufacturing optical fibers – waveguides – or...
Patent
1997-09-19
1999-01-12
Chin, Peter
Glass manufacturing
Processes of manufacturing fibers, filaments, or preforms
Process of manufacturing optical fibers, waveguides, or...
65 6053, 65 66, 65404, 65430, 501 37, 501 40, 501904, C03C 1700, C03C 2502, C03B 900, C03B 1100
Patent
active
058580522
ABSTRACT:
The specification describes a method for the manufacture of fluoride glass optical fibers which are covered with a protective coating of phosphate glass. The coating is produced by dipping the fluoride glass preform in a phosphate glass melt prior to drawing the optical fiber. The fluoride glass is ZBLAN. The phosphate glass has a glass transition temperature below 200.degree. C., which allows the dipping step to be carried out at a relatively low temperature where the preform temperature is maintained well below the crystallization temperature of the fluoride glass, and also where the viscosity of the fluoride glass preform is substantially higher than the viscosity of the phosphate glass coating material.
REFERENCES:
patent: 4883339 (1989-11-01), Vacha et al.
patent: 4938562 (1990-07-01), Vacha et al.
patent: 5285518 (1994-02-01), Elyamani et al.
Y.B. Peng, D.E. Day, "High thermal expansion phosphate glasses" Glass Technology, vol. 32, p. 166, Oct. 1991.
Kopylov Nonna
Kortan Ahmet Refik
Chin Peter
Lucent Technologies - Inc.
Ruller Jacqueline A.
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