Patent US4283213A successfully refreshed from Google Patents.
US4283213A
Expired / Lapsed
US
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Method of fabrication of single mode optical fibers or waveguides
Assignee: U S Holding Co Inc
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Filing: 1979-10-22
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Granted: 1981-08-11
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Expires: 1999-10-22
Abstract
Abstract A method for fabricating a fiber with optical cores of diameters between 2 to 20 microns is depicted. A first step includes the fabrication of a step-index preform of predetermined dimensions. The preform is drawn into a conventional fiber by conventional techniques resulting in a fiber having an outer diameter of about 120 microns or larger. The fiber is then emplaced in a glass tube. The tube is collapsed on the fiber by heating the same resulting in a second preform. This preform is again drawn into a fiber by conventional techniques to obtain a final fiber having core dimensions indicative of single mode operation with compatible outer diameters.
Inventors
- 👤 Francis I. Akers
- 👤 Mokhtar S. Maklad
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:58
CPC Classifications
C; C03; C03C; C03C13/00; C03C13/04; C03B; C03B37/00; C03B37/01; C03B37/012; C03B37/01205; C03B37/01211; C03B37/02; C03B37/025; C03B37/027; C03C25/00; C03C25/10; C03C25/104; C03C25/106; C03C25/1061; C03B2203/00; C03B2203/10; C03B2203/22; C03B2203/24
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
125 words
A method for fabricating an optical fiber comprising the steps of: forming a first solid glass preform having a central core region of a first diameter, a cladding layer surrounding said core and a substrate layer surrounding said cladding layer, heating and drawing said first solid preform into a first fiber having a core of a second diameter smaller than said first diamater, collapsing a glass tube about said first fiber by heat shrinking to form a second solid preform having a core of the second diameter, heating and drawing said second solid preform into a second fiber having a core of a third diameter substantially smaller than the second diameter of said first fiber, whereby said second fiber is capable of single mode operation.
Claim 2
Independent Claim
125 words
A method for fabricating an optical fiber comprising the steps of: forming a first solid glass preform having a central core region of a first diameter, a cladding layer surrounding said core and a substrate layer surrounding said cladding layer, heating and drawing said first solid preform into a first fiber having a core of a second diameter smaller than said first diamater, collapsing a glass tube about said first fiber by heat shrinking to form a second solid preform having a core of the second diameter, heating and drawing said second solid preform into a second fiber having a core of a third diameter substantially smaller than the second diameter of said first fiber, whereby said second fiber is capable of single mode operation.
Claim 3
Dependent Claim
14 words
The method according to claim 1 wherein said first preform is a step-index preform.
Claim 4
Dependent Claim
28 words
The method according to claim 1 wherein said first fiber has an outer diameter of greater than 120 microns with a core diameter of greater than 50 microns.
Claim 5
Dependent Claim
19 words
The method according to claim 1 wherein said second fiber has a core diameter between 2 to 20 microns.
Claim 6
Dependent Claim
20 words
The method according to claim 1 wherein said core is fabricated from a silicate glass doped with germanium or phosphorous.
Claim 7
Dependent Claim
24 words
The method according to claim 1 wherein said glass tube is collapsed by heating the same at a temperature in excess of 1500° C.
Claim 8
Dependent Claim
19 words
The method according to claim 1 wherein said glass tube has a wall thickness between 1.0 to 3.0 mm.
Claim 9
Dependent Claim
16 words
The method according to claim 1 wherein said glass tube is fabricated from a quartz glass.
Claim 10
Dependent Claim
27 words
The method according to claim 1 wherein said substrate layer is fabricated from a quartz glass with said core and cladding layer fabricated from a silicate glass.
Claim 11
Dependent Claim
28 words
The method according to claim 1 further comprising the steps of heating said first preform to soften the same prior to drawing said preform into said first fiber.
Claim 12
Dependent Claim
20 words
The method according to claim 1 wherein said core is fabricated from a silicate glass doped with phosphorous and germanium.
Claim 13
Dependent Claim
16 words
The method according to claim 1 wherein said glass tube is fabricated from a borosilicate glass.
Claim 14
Dependent Claim
25 words
The method according to claim 1 wherein said substrate layer is fabricated from a borosilicate glass and said cladding layer fabricated from a silicate glass.
Claim 15
Dependent Claim
25 words
The method according to claim 8 wherein said substrate comprises a silica tube with a borosilicate layer deposited on the inside of the said tube.
Claim 16
Independent Claim
24 words
The method according to claims 9 or 12 or 14 wherein said first fiber is fabricated from an optical grade pure silicon dioxide composition.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-08-10 | 1985-02-09 | 1985-08-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-08-10 | 1989-02-09 | 1989-08-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-08-10 | 1993-02-09 | 1993-08-11 | $7700.00 | Window Closed / Lapsed |