US4493530A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Single polarization optical fibers
Assignee: Hitachi Cable Ltd
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Filing: 1982-07-02
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Granted: 1985-01-15
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Expires: 2002-07-02
Abstract
Abstract A single polarization optical fiber has an elliptical jacket composed of SiO2+F2O+P2O5, whereby increase in transmission loss at a long wavelength band is prevented.
Inventors
- 👤 Hiroshi Kajioka
- 👤 Toshihide Tokunaga
- 👤 Junkichi Nakagawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 10:18
CPC Classifications
G; G02; G02B; G02B6/00; G02B6/10; G02B6/105
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
80 words
A single polarization optical fiber comprising a circular core having a refractive index n 1 , a circular cladding outside the circular core and having a refractive index n 2 that is less than n 1 , and an elliptical jacket outside the circular cladding and having a refractive index n 3 that is between n 1 and n 2 and having a softening point below the softening point of the cladding, said jacket being formed of a fluoro-phosphosilicate glass.
Claim 2
Dependent Claim
80 words
A single polarization optical fiber comprising a circular core having a refractive index n 1 , a circular cladding outside the circular core and having a refractive index n 2 that is less than n 1 , and an elliptical jacket outside the circular cladding and having a refractive index n 3 that is between n 1 and n 2 and having a softening point below the softening point of the cladding, said jacket being formed of a fluoro-phosphosilicate glass.
Claim 3
Dependent Claim
27 words
A fiber according to claim 1, further comprising a support outside said jacket and having a refractive index n 4 which is less than n 3 .
Claim 4
Dependent Claim
35 words
A fiber according to claim 1, in which the cladding is formed of substantially pure SiO 2 , the core is formed of a glass of SiO 2 and a component for increasing refractive index.
Claim 5
Dependent Claim
17 words
A fiber according to claim 3, in which the core is formed of a germania containing glass.
Claim 6
Dependent Claim
28 words
A fiber as claimed in claim 1, wherein said jacket contains F 2 O for decreasing refractive index and P 2 O 5 for lowering the softening temperature.
Claim 7
Dependent Claim
24 words
A fiber as claimed in claim 1, wherein said elliptical jacket contains 5-20 mol% of F 2 O and P 2 O 5 .
Claim 8
Dependent Claim
91 words
A single polarization optical fiber comprising: a circular core having a predetermined first refractive index; a circular cladding positioned on the outside of said circular core and having a second refractive index smaller than said first refractive index; an elliptical jacket positioned on the outside of said circular cladding containing F 2 O for decreasing refractive index and P 2 O 5 for lowering softening temperature and having an intermediate third refractive index between said first and second refractive indices; and a support positioned on the outside of said elliptical jacket.
Claim 9
Dependent Claim
91 words
A single polarization optical fiber comprising: a circular core having a predetermined first refractive index; a circular cladding positioned on the outside of said circular core and having a second refractive index smaller than said first refractive index; an elliptical jacket positioned on the outside of said circular cladding containing F 2 O for decreasing refractive index and P 2 O 5 for lowering softening temperature and having an intermediate third refractive index between said first and second refractive indices; and a support positioned on the outside of said elliptical jacket.
Claim 10
Dependent Claim
28 words
A single polarization optical fiber as claimed in claim 7, wherein said elliptical jacket contains 5-20 mol % of F 2 O and P 2 O 5 .
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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) | 1988-01-15 | 1988-07-16 | 1989-01-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-01-15 | 1992-07-16 | 1993-01-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-01-15 | 1996-07-16 | 1997-01-15 | $7700.00 | Window Closed / Lapsed |