US4302074A
Expired / Lapsed
US
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Aluminum metaphosphate optical fibers
Assignee: AT&T Inc
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Filing: 1979-04-02
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Granted: 1981-11-24
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Expires: 1999-04-02
Abstract
Abstract Aluminum metaphosphate optical fibers are disclosed. In a specific embodiment, aluminum metaphosphate, doped with from 10 to 30 mole percent of diboron trioxide, is found to yield an optical fiber which combines the desirable properties of both high numerical aperture and low material dispersion. The fiber is nonhygroscopic and has a high melting temperature. The index of refraction of the glass may be lowered by doping with silicon dioxide. Consequently, a graded fiber may be made by increasing the concentration of silicon oxide from the core to the cladding.
Inventors
- 👤 James W. Fleming, Jr.
- 👤 John W. Shiever
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 18:13
CPC Classifications
C; C03; C03C; C03C13/00; C03C13/04; C03C13/045; C03C13/046; C03C13/048; Y; Y10; Y10S; Y10S501/00; Y10S501/90
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
37 words
An optical fiber comprising a core and a cladding, the said fiber comprising aluminum metaphosphate, and in which fiber the molar ratio of aluminum to phosphorus is given substantially by the formula Al(PO 3 ) 3 .
Claim 2
Dependent Claim
37 words
An optical fiber comprising a core and a cladding, the said fiber comprising aluminum metaphosphate, and in which fiber the molar ratio of aluminum to phosphorus is given substantially by the formula Al(PO 3 ) 3 .
Claim 3
Dependent Claim
19 words
The fiber of claim 1 wherein the core is doped with from 10 to 30 molar percent diboron trioxide.
Claim 4
Dependent Claim
14 words
The fiber of claim 1 wherein the core is further doped with silicon dioxide.
Claim 5
Dependent Claim
18 words
The fiber of claim 2 or 3 wherein the index of refraction of the core is radially graded.
Claim 6
Dependent Claim
15 words
The fiber of claims 1, 2 or 3 further comprising a cladding comprising silicon dioxide.
Claim 7
Dependent Claim
12 words
The fiber of claim 5 wherein the cladding futher comprises diboron trioxide.
Claim 8
Dependent Claim
12 words
The fiber of claim 5 wherein the cladding further comprises aluminum metaphosphate.
Claim 9
Dependent Claim
15 words
The fiber of claims 1, 2 or 3 further comprising a cladding comprising diboron trioxide.
Claim 10
Dependent Claim
20 words
The fiber of claims 1, 2 or 3 further comprising a cladding comprising aluminum metaphosphate, diboron trioxide and silicon dioxide.
References Cited (Backward Citations)
GB649511A
Cited
US3778132A
Cited
US4217027A
Cited
US4217027B1
Cited
US3989350A
Cited
US4127415A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-11-23 | 1985-05-25 | 1985-11-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-11-23 | 1989-05-25 | 1989-11-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-11-23 | 1993-05-25 | 1993-11-24 | $7700.00 | Window Closed / Lapsed |