US4114980A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Low loss multilayer optical fiber
Assignee: U S Holding Co Inc
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Filing: 1976-05-10
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Granted: 1978-09-19
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Expires: 1996-05-10
Abstract
Abstract A low loss multilayer optical fiber having good transmission propertiesin the infrared region of the spectrum is produced by depositing the core and cladding materials on the inner surface of a collapsible silica tube in the absence of moisture. A barrier layer is interposed between the silica tube and the cladding to prevent the migration of OH and transition metal ions during the tube collapsing and fiber drawing processes.
Inventors
- 👤 Adolf R. Asam
- 👤 Mokhtar S. Maklad
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:50
CPC Classifications
G; G02; G02B; G02B6/00; G02B6/02; G02B6/036; G02B6/03694; C; C03; C03B; C03B37/00; C03B37/01; C03B37/012; C03B37/014; C03B37/018; G02B6/03616; G02B6/03638; G02B6/03661; G02B6/10; G02B6/102; G02B6/44; G02B6/4401
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
85 words
A low loss high numerical aperture optical communications fiber comprising: a core member consisting of a high refractive index material deposited in the absence of hydrogen; a cladding layer consisting of a lower index of refraction material deposited in the absence of hydrogen, said cladding layer surrounding said core member; a hydroxyl barrier layer surrounding said cladding layer to prevent hydroxyl ions from diffusing into said core and cladding; and an outer silica layer enclosing said barrier layer for providing structural support to the fiber.
Claim 2
Dependent Claim
85 words
A low loss high numerical aperture optical communications fiber comprising: a core member consisting of a high refractive index material deposited in the absence of hydrogen; a cladding layer consisting of a lower index of refraction material deposited in the absence of hydrogen, said cladding layer surrounding said core member; a hydroxyl barrier layer surrounding said cladding layer to prevent hydroxyl ions from diffusing into said core and cladding; and an outer silica layer enclosing said barrier layer for providing structural support to the fiber.
Claim 3
Dependent Claim
16 words
The fiber of claim 1 wherein said barrier layer is deposited in the absence of hydrogen.
Claim 4
Dependent Claim
21 words
The fiber of claim 1 wherein the outer silica layer has a higher concentration of hydroxyl ions than said barrier layer.
Claim 5
Dependent Claim
18 words
The fiber of claim 1 wherein said barrier layer comprises silica deposited by the dissociation of silicon tetrachloride.
Claim 6
Dependent Claim
21 words
The fiber of claim 1 wherein said cladding layer comprises borosilicate deposited by the dissociation of silicon tetrachloride and boron trichloride.
Claim 7
Dependent Claim
21 words
The fiber of claim 1 wherein said core comprises germania silicate deposited by the dissociation of germanium tetrachloride and silicon tetrachloride.
Claim 8
Dependent Claim
19 words
The fiber of claim 1 wherein said barrier and cladding layers have a thickness of at least 15 microns.
Claim 9
Dependent Claim
11 words
The fiber of claim 1 wherein said numerical aperture ≧ 0.35.
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) | 1981-09-18 | 1982-03-20 | 1982-09-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-09-18 | 1986-03-20 | 1986-09-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-09-18 | 1990-03-20 | 1990-09-19 | $7700.00 | Window Closed / Lapsed |