US4807950A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for impressing gratings within fiber optics
Assignee: RTX Corp
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Filing: 1987-11-19
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Granted: 1989-02-28
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Expires: 2007-11-19
Abstract
Abstract An optical fiber has a dielectric periodic index of refraction phase grating established in its core by intense angled application of several transverse beams of ultraviolet light, enabling the establishment of a distributed, spatially resolving optical fiber strain gauge.
Inventors
- 👤 William H. Glenn
- 👤 Gerald Meltz
- 👤 Elias Snitzer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 13:28
CPC Classifications
G; G02; G02B; G02B5/00; G02B5/18; G02B6/00; G02B6/02; G02B6/02057; G02B6/02076; G02B6/02123; G02B6/02133; G02B6/02195; G02B6/022; G02B6/02204; G02B6/10; G02B6/12; G02B6/122; G02B6/124; Y; Y10; Y10S; Y10S359/00; Y10S359/90
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
105 words
An optical fiber having a single core including at least one grating with a predetermined grating spacing permanently provided in at least one grating region of the core by exposing the core to an interference pattern resulting from mutual interference of two beams of ultraviolet radiation simultaneously directed at the fiber at such different acute angles of incidence relative to the longitudinal axis of the core that the interference pattern has fringes situated at said predetermined grating spacing from each other and propagates transversely through the core with attendant permanent change in the index of refraction of the core in correspondence with the interference pattern.
Claim 2
Dependent Claim
105 words
An optical fiber having a single core including at least one grating with a predetermined grating spacing permanently provided in at least one grating region of the core by exposing the core to an interference pattern resulting from mutual interference of two beams of ultraviolet radiation simultaneously directed at the fiber at such different acute angles of incidence relative to the longitudinal axis of the core that the interference pattern has fringes situated at said predetermined grating spacing from each other and propagates transversely through the core with attendant permanent change in the index of refraction of the core in correspondence with the interference pattern.
Claim 3
Dependent Claim
28 words
The optical fiber according to claim 1, wherein said different acute angles of incidence complement one another to 180° with respect to the longitudinal axis of the core.
Claim 4
Dependent Claim
41 words
The optical fiber according to claim 2, wherein the core includes at least one additional grating similar to and provided in the same manner as said one grating but having a predetermined grating spacing different from that of said one grating.
Claim 5
Dependent Claim
17 words
The optical fiber according to claim 3, wherein said additional grating is provided at said grating region.
Claim 6
Dependent Claim
27 words
The optical fiber according to claim 3, wherein said additional grating is provided in an additional grating region that is longitudinally spaced from said one grating region.
References Cited (Backward Citations)
JPS55110207A
Cited
US4400056A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-02-28 | 1992-08-29 | 1993-02-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-02-28 | 1996-08-29 | 1997-02-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-02-28 | 2000-08-29 | 2001-02-28 | $7700.00 | Window Closed / Lapsed |