Patent US3705992A successfully refreshed from Google Patents.
US3705992A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Broadband tunable raman-effect devices in optical fibers
Assignee: AT&T Inc
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Filing: 1971-12-13
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Granted: 1972-12-12
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Expires: 1991-12-13
Abstract
Abstract STIMULATED RAMAN EMISSION IN THE VISIBLE HAS BEEN OBSERVED IN GLASS-FIBER OPTICAL WAVEGUIDES. EVEN THROUGH THE RAMAN CROSS SECTION IS QUITE SMALL, RELATIVELY LOW THRESHOLD FOR RAMAN EMISSION CAN BE ACHIEVED BECAUSE HIGH OPTICAL POWER DENSITIES ARE MAINTAINED OVER LONG LENGTHS OF WAVEGUIDE. THE BROAD STIMULATED GAIN BRANDWIDTHS AVAILABLE IN GLASS SHOULD PERMIT THE CONSTRUCTION OF WIDEBAND FIBER AMPLIFERS AND RAMAN OSCILLATORS TURNABLE OVER A RANGE OF ABOUT 100 ANGSTROMS.
Inventors
- 👤 Erich Peter Ippen
- 👤 Chandra Kumar Naranbhai Patel
- 👤 Rogers Hall Stolen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 22:24
CPC Classifications
H; H01; H01S; H01S3/00; H01S3/30; H01S3/302
Claims Analysis
Total Claims: 0
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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) | 1975-12-12 | 1976-06-12 | 1976-12-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-12-12 | 1980-06-12 | 1980-12-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-12-12 | 1984-06-12 | 1984-12-12 | $7700.00 | Window Closed / Lapsed |