Patent US3825319A successfully refreshed from Google Patents.
US3825319A
Expired / Lapsed
US
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Butt-joined optical fibers
Assignee: AT&T Inc
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Filing: 1973-02-26
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Granted: 1974-07-23
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Expires: 1993-02-26
Abstract
Abstract In order to minimize electromagnetic radiation losses in optical fibers (especially single-mode fibers) at the locations where the fibers are joined together as by butt-joining, such optical fibers are constructed with a reduced diameter at the joint locations. The reduced dimaeters of the fibers at the locations of joining (''''joints'''') cause an increase in the diameter of the cross section of electromagnetic field at these locations. Thereby, electromagnetic radiation losses due to lateral misalignments at joint locations in optical fibers are reduced.
Inventors
- 👤 J Cook
- 👤 E Marcatili
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:54
CPC Classifications
G; G02; G02B; G02B6/00; G02B6/24; G02B6/255; G02B6/2551; G02B6/26; G02B6/262
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
92 words
An optical fiber structure which includes at least a pair of optical fibers having core portions which have been joined together at a given joint location, characterized in that the diameters of the cross sections of the cores of both of the optical fibers are smaller by a factor of between about 1.5 and 3 at the joint location than at the bulk of locations along both fibers which are removed from the joint location and which account for most of distance along which optical radiation transmission can occur in the structure.
Claim 2
Dependent Claim
92 words
An optical fiber structure which includes at least a pair of optical fibers having core portions which have been joined together at a given joint location, characterized in that the diameters of the cross sections of the cores of both of the optical fibers are smaller by a factor of between about 1.5 and 3 at the joint location than at the bulk of locations along both fibers which are removed from the joint location and which account for most of distance along which optical radiation transmission can occur in the structure.
Claim 3
Dependent Claim
23 words
The structure recited in claim 1 in which both fiber portions in the structure have substantially identical cross sections at the joint location.
Claim 4
Dependent Claim
45 words
The structure recited in claim 2 in which the linear dimensions of the cross sections of the cores of the joint locations of each of the fiber portions are substantially identical to within less than about a tenth of a wavelength of the optical radiation.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-07-22 | 1978-01-21 | 1978-07-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-07-22 | 1982-01-21 | 1982-07-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-07-22 | 1986-01-21 | 1986-07-23 | $7700.00 | Window Closed / Lapsed |