US4653852A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Multi core optical fiber
Assignee: Sumitomo Electric Industries Ltd
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Filing: 1985-01-03
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Granted: 1987-03-31
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Expires: 2005-01-03
Abstract
Abstract A multi core optical fiber made of quartz glass comprising at least two cores the centers of which are arranged substantially on one line. The distances between the centers of the adjacent cores are substantially the same in the longitudinal direction. A first cladding covers the cores and the second cladding covers the first cladding and has a larger refractive index than the first one. The fiber has improved mechanical strength and low cross-talk even if the distance between the adjacent cores is short.
Inventors
- 👤 Shuzo Suzuki
- 👤 Ichiro Ogasawara
- 👤 Hiroshi Yokota
- 👤 Shim Sumida
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 13:31
CPC Classifications
G; G02; G02B; G02B6/00; G02B6/44; G02B6/4401; G02B6/4403
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
68 words
A multi core optical fiber made of quartz glass comprising: a plurality of cores having centers arranged substantially on one line, wherein the distances between the centers of adjacent cores are substantially the same in the longitudinal direction, a one piece first cladding surrounding said plurality of cores and, a one piece second cladding surrounding said first cladding and having a larger refractive index than said first cladding.
Claim 2
Dependent Claim
68 words
A multi core optical fiber made of quartz glass comprising: a plurality of cores having centers arranged substantially on one line, wherein the distances between the centers of adjacent cores are substantially the same in the longitudinal direction, a one piece first cladding surrounding said plurality of cores and, a one piece second cladding surrounding said first cladding and having a larger refractive index than said first cladding.
Claim 3
Dependent Claim
16 words
A multi core optical fiber according to claim 1, wherein said second cladding has no depressions.
Claim 4
Dependent Claim
16 words
A multi core optical fiber according to claim 1, wherein said first cladding has no depressions.
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) | 1990-03-30 | 1990-09-29 | 1991-03-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-03-30 | 1994-09-29 | 1995-03-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-03-30 | 1998-09-29 | 1999-03-31 | $7700.00 | Window Closed / Lapsed |