Patent US3844752A successfully refreshed from Google Patents.
US3844752A
Expired / Lapsed
US
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Method for fabricating an optical fiber cable
Assignee: AT&T Inc
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Filing: 1973-08-20
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Granted: 1974-10-29
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Expires: 1993-08-20
Abstract
Abstract In order to fabricate a number of multimode single material optical fibers in a single cable, an array of both hollow thinwalled glass tubes and solid glass rods of the same material are placed within the cable to provide the preform assembly for a multiple-core fiber cable. An optical waveguide is formed by each solid rod being supported within the hollow cable by the adjacent hollow tubes. Thereby, each core in the final structure is capable of supporting multimode optical propagation.
Inventors
- 👤 P Kaiser
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:34
CPC Classifications
C; C03; C03B; C03B37/00; C03B37/01; C03B37/012; C03B37/01205; C03B37/01211; C03B37/01214; C03B23/00; C03B23/20; C03B23/207; C03B37/02; C03B37/025; C03B37/028; G; G02; G02B; G02B6/00; G02B6/44; G02B6/4479; G02B6/448; C03B2203/00; C03B2203/02; C03B2203/04; C03B2203/10; C03B2203/14
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
148 words
The method of making an optical cable which comprises the steps of: a. placing an array of a first plurality of substantially identical transparent solid optical fiber preforms and a second plurality of substantially identical hollow optical fiber preforms in an enclosure preform, each of said solid preforms being contacted by some of said hollow preforms and each of the solid preforms being of essentially the same optical fiber preform material as the material of the hollow preforms in their neighborhoods contacting it, to form a preform assembly of the enclosure preform and of the fiber preforms in a predetermined geometric cross-sectional pattern relationship; b. heating the preform assembly to a predetermined temperature suitable for drawing the assembly longitudinally to increase the length of the fibers; and c. longitudinally drawing the preform assembly to a predetermined length, whereby each solid preform provides a core for optical waveguide propagation.
Claim 2
Independent Claim
148 words
The method of making an optical cable which comprises the steps of: a. placing an array of a first plurality of substantially identical transparent solid optical fiber preforms and a second plurality of substantially identical hollow optical fiber preforms in an enclosure preform, each of said solid preforms being contacted by some of said hollow preforms and each of the solid preforms being of essentially the same optical fiber preform material as the material of the hollow preforms in their neighborhoods contacting it, to form a preform assembly of the enclosure preform and of the fiber preforms in a predetermined geometric cross-sectional pattern relationship; b. heating the preform assembly to a predetermined temperature suitable for drawing the assembly longitudinally to increase the length of the fibers; and c. longitudinally drawing the preform assembly to a predetermined length, whereby each solid preform provides a core for optical waveguide propagation.
Claim 3
Dependent Claim
24 words
The method of claim 1 in which the solid fiber preforms are solid circular cylinders and the hollow fiber preforms are hollow circular cylinders.
Claim 4
Dependent Claim
37 words
The method of claim 2 in which the hollow fiber preforms contain optically absorbing portions and in which the remainder of these hollow preforms are essentially of the same material as that of the solid fiber preforms.
Claim 5
Dependent Claim
34 words
The method of claim 1 in which the array comprises three rows of fiber preforms, the top and bottom rows being all of hollow preforms, and the intermediate row being all of solid preforms.
Claim 6
Dependent Claim
15 words
The method of claim 4 in which the fiber preforms have circularly cylindrical outside walls.
Claim 7
Dependent Claim
24 words
The method recited in claim 1 in which each of said solid preforms is being contacted by at least four of said hollow preforms.
References Cited (Backward Citations)
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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) | 1977-10-28 | 1978-04-29 | 1978-10-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-10-28 | 1982-04-29 | 1982-10-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-10-28 | 1986-04-29 | 1986-10-29 | $7700.00 | Window Closed / Lapsed |