Patent US4525027A successfully refreshed from Google Patents.
US4525027A
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Single mode optical fibers
Assignee: NTT Inc
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Filing: 1984-09-05
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Granted: 1985-06-25
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Expires: 2004-09-05
Abstract
Abstract In a single mode optical fiber comprising a core made of glass and a cladding surrounding the core and made of glass, when a difference DELTA between refractive indices n1 and n2 of the core and cladding is expressed by (n1-n2)/(n1)x100%, the refractive indices n1 and n2 are determined to satisfy a relation 1.0< DELTA <3.6 and a diameter of the core is determined according to this value of DELTA .
Inventors
- 👤 Katsunari Okamoto
- 👤 Takao Edahiro
- 👤 Akio Kawana
- 👤 Tetsuo Miya
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 09:44
CPC Classifications
G; G02; G02B; G02B6/00; G02B6/02; G02B6/02214; G02B6/02219; G02B6/02228; G02B6/02238
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
102 words
A single mode optical fiber comprising a core having a diameter of 2a and made of glass having a refractive index of n 1 , and a cladding surrounding the core and made of glass having a refractive index of n 2 wherein when a refractive index difference Δ is expressed by n 1 -n 2 /n 1 ×100, said refractive indices n 1 and n 2 are determined to satisfy a relation 1.0<Δ<3.6 and the diameter 2a of said core is selected to have a value in a range of 4.8 to 3.0 microns as determined by the value of Δ.
Claim 2
Dependent Claim
102 words
A single mode optical fiber comprising a core having a diameter of 2a and made of glass having a refractive index of n 1 , and a cladding surrounding the core and made of glass having a refractive index of n 2 wherein when a refractive index difference Δ is expressed by n 1 -n 2 /n 1 ×100, said refractive indices n 1 and n 2 are determined to satisfy a relation 1.0<Δ<3.6 and the diameter 2a of said core is selected to have a value in a range of 4.8 to 3.0 microns as determined by the value of Δ.
Claim 3
Dependent Claim
21 words
The single mode optical fiber according to claim 1 wherein said core and said cladding are essentially made of quartz glass.
Claim 4
Dependent Claim
35 words
The single mode optical fiber according to claim 2 wherein said core is made of quartz glass incorporated with a dopant which makes larger the refractive index of said core than that of said cladding.
Claim 5
Dependent Claim
31 words
The single mode optical fiber according to claim 3 wherein said dopant is a member selected from a group consisting of germanium, phosphor, titanium, aluminum, tantalum, zirconium, lead, barium, and gallium.
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) | 1988-06-24 | 1988-12-24 | 1989-06-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-06-24 | 1992-12-24 | 1993-06-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-06-24 | 1996-12-24 | 1997-06-25 | $7700.00 | Window Closed / Lapsed |