Glass manufacturing – Processes – Forming product or preform from molten glass
Patent
1987-01-12
1989-03-14
Schor, Kenneth M.
Glass manufacturing
Processes
Forming product or preform from molten glass
65 311, 65 315, 65 182, 65 183, 65 184, 65 3013, 65 31, 65900, C03C 2502
Patent
active
048121533
ABSTRACT:
A glass body having a graded (substantially Gaussian) index profile is produced by a process that comprises providing a doped porous body (e.g., having a uniform dopant distribution), heat treating the porous body in a halogen-containing atmosphere, and consolidating the porous body into the glass body. The heat treatment removes a predetermined portion of the dopant from the porous body, such that the radial dopant profile in the glass body differs from the initial profile in the porous body, and such that the Gaussian index profile results. Exemplarily, the porous body is a uniformly germania-doped, VAD-produced, high-silica rod having radially decreasing density, and the heat treatment comprises an 8-hour densification soak at 1300.degree. C. in 20% Cl, 80% He. In a preferred embodiment, silica overcladding is deposited on a graded index core rod produced according to the invention, and fiber drawn from the resulting composite glass body.
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Journal of Lightwave Technology, vol. LT-4, No. 8, Aug. 1986, "Design and Performance of Gaussian-Profile Dispersion-Shifted Fibers Manufactured by VAD Process", by R. Yamauchi et al., pp. 997-10004.
Andrejco Matthew J.
MacChesney John B.
American Telephone and Telegraph Company
AT&T Bell Laboratories & Bell Communications Research
Johnson L.
Pacher Eugen E.
Schor Kenneth M.
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