Patent US4163370A successfully refreshed from Google Patents.
US4163370A
Expired / Lapsed
US
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Controlling the drawing rollers to produce diameter perturbations in an optical waveguide
Assignee: Corning Glass Works
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Filing: 1977-11-21
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Granted: 1979-08-07
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Expires: 1997-11-21
Abstract
Abstract An optical waveguide having variations in diameter is produced by controlling the drawing rollers. Predetermined diameter variations along the length of an optical waveguide reduce dispersion in multimode waveguides. These diameter variations are produced by varying the rotational speed of the pulling rollers, by varying the diameter of the pulling rollers, by moving the pulling rollers axially or by moving a tensioning roller during the drawing process.
Inventors
- 👤 Thomas C. Kurth
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 22:39
CPC Classifications
C; C03; C03B; C03B37/00; C03B37/01; C03B37/02; C03B37/03; C03B37/025; C03B37/027; C03B2203/00; C03B2203/02; C03B2203/06; C03B2203/10; C03B2203/18
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
77 words
The method of producing an optical waveguide comprising: providing a glass tube having a core with an index of refraction higher than the cladding thereof, heating said glass tube to the drawing temperature of the materials thereof, drawing the heated composite structure with a single pair of pulling rollers to reduce the cross-sectional area thereof, and controlling the tangential velocity of said rollers with time to produce diameter varying perturbations spaced along the length of said waveguide.
Claim 2
Independent Claim
77 words
The method of producing an optical waveguide comprising: providing a glass tube having a core with an index of refraction higher than the cladding thereof, heating said glass tube to the drawing temperature of the materials thereof, drawing the heated composite structure with a single pair of pulling rollers to reduce the cross-sectional area thereof, and controlling the tangential velocity of said rollers with time to produce diameter varying perturbations spaced along the length of said waveguide.
Claim 3
Independent Claim
99 words
A method of manufacturing an optical fiber comprising the steps of: heating the lower extremity of a substantially vertically disposed preform to soften the preform; and drawing the optical fiber from said softened preform, said method being characterized by the further steps of: passing said optical fiber, while still in a softened state, through a single pair of rollers having variations in radii which produces tangential velocity changes; and rotating said rollers in synchronism with the rate at which said fiber is drawn from the softened preform to produce diameter varying perturbations spaced along the length of said waveguide.
Claim 4
Independent Claim
99 words
A method of manufacturing an optical fiber comprising the steps of: heating the lower extremity of a substantially vertically disposed preform to soften the preform; and drawing the optical fiber from said softened preform, said method being characterized by the further steps of: passing said optical fiber, while still in a softened state, through a single pair of rollers having variations in radii which produces tangential velocity changes; and rotating said rollers in synchronism with the rate at which said fiber is drawn from the softened preform to produce diameter varying perturbations spaced along the length of said waveguide.
Claim 5
Dependent Claim
34 words
The method recited in claim 1 wherein said pulling rollers have a uniform diameter and wherein the rotational velocity of said pulling rollers is changed with time in order to produce said diameter perturbations.
Claim 6
Dependent Claim
34 words
The method recited in claim 1 wherein the rotational speed of said pulling rollers is constant and wherein said pulling rollers have a varying diameter in order to produce the changes in tangential velocity.
References Cited (Backward Citations)
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Cited
US3819344A
Cited
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Cited
US4028081A
Cited
US4038062A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-08-06 | 1983-02-05 | 1983-08-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-08-06 | 1987-02-05 | 1987-08-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-08-06 | 1991-02-05 | 1991-08-07 | $7700.00 | Window Closed / Lapsed |