US4750801A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Optical waveguide resonator filters
Assignee: Nokia Bell Labs
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Filing: 1985-09-30
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Granted: 1988-06-14
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Expires: 2005-09-30
Abstract
Abstract An optical filter using first and second grating sections separated by a changed refractive index section operates as a narrowband grating resonator.
Inventors
- 👤 Rodney C. Alferness
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 01:08
CPC Classifications
H; H01; H01S; H01S5/00; H01S5/10; H01S5/1028; G; G02; G02B; G02B6/00; G02B6/10; G02B6/12; G02B6/122; G02B6/124; G02F; G02F1/00; G02F1/01; G02F1/21; G02F1/225; H01S5/1032; H01S5/12; G02B2006/12083; G02B2006/12107; G02B2006/12109; H01S5/06; H01S5/062; H01S5/0625; H01S5/06255; H01S5/06256; H01S5/06258; H01S5/1228; Y; Y10; Y10S; Y10S359/00; Y10S359/90
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
75 words
An optical filter comprising a substrate having a first refractive index and, disposed on said substrate, first and second grating sections and a waveguide phase shift section, said first and second grating sections being geometrically in phase with each other and spatially separated from one another, said waveguide phase shift section being between said first and second grating sections and for introducing an optical phase shift of π/2 between said first and second grating sections.
Claim 2
Dependent Claim
75 words
An optical filter comprising a substrate having a first refractive index and, disposed on said substrate, first and second grating sections and a waveguide phase shift section, said first and second grating sections being geometrically in phase with each other and spatially separated from one another, said waveguide phase shift section being between said first and second grating sections and for introducing an optical phase shift of π/2 between said first and second grating sections.
Claim 3
Dependent Claim
15 words
A filter as recited in claim 1 in which said sections comprise a compound simiconductor.
Claim 4
Dependent Claim
17 words
A filter as recited in claim 2 in which said compound semiconductors comprise Group III-V compound semiconductors.
Claim 5
Dependent Claim
14 words
A filter as recited in claim 1 in which said sections comprise lithium niobate.
Claim 6
Dependent Claim
13 words
A filter as recited in claim 1 in which said sections comprise silica.
Claim 7
Dependent Claim
15 words
A filter recited in claim 1 further comprising an electrode to said phase shift section.
Claim 8
Dependent Claim
23 words
A filter as recited in claim 1 further comprising a light source, said light source being optically coupled to said first grating section.
References Cited (Backward Citations)
US3884549A
Cited
US4461535A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-06-14 | 1991-12-14 | 1992-06-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-06-14 | 1995-12-14 | 1996-06-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-06-14 | 1999-12-14 | 2000-06-14 | $7700.00 | Window Closed / Lapsed |