Patent US4889402A successfully refreshed from Google Patents.
US4889402A
Expired / Lapsed
US
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Electro-optic polarization modulation in multi-electrode waveguides
Assignee: Nokia Bell Labs
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Filing: 1989-04-21
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Granted: 1989-12-26
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Expires: 2009-04-21
Abstract
Abstract A rib waveguide polarization modulator is described that permits easy application to monolithic optical circuits. The device comprises a rib waveguide having two polarization modulation sections with a phasing section between the two modulation section. The phasing section adjusts the phase of the optical radiation in the waveguide before it enters the second modulation section.
Inventors
- 👤 Franz K. Reinhart
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 22:57
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/015; G02F1/025; G02F1/0151; G02F2203/00; G02F2203/07
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
83 words
An optical device comprising a substrate-supported waveguide, said waveguide consisting essentially of an electro-optic material in a waveguiding structure having a preferred direction of light propagation, first and second electrodes disposed at least in part on said waveguide and spaced apart in said direction, the space between said electrodes comprising means for adjusting the phase of optical radiation in said waveguide, and an electrical signal source connected to said electrodes such that the same signal is applied to said first and second electrodes.
Claim 2
Dependent Claim
83 words
An optical device comprising a substrate-supported waveguide, said waveguide consisting essentially of an electro-optic material in a waveguiding structure having a preferred direction of light propagation, first and second electrodes disposed at least in part on said waveguide and spaced apart in said direction, the space between said electrodes comprising means for adjusting the phase of optical radiation in said waveguide, and an electrical signal source connected to said electrodes such that the same signal is applied to said first and second electrodes.
Claim 3
Dependent Claim
15 words
An optical device as recited in claim 1 in which said phasing means is tunable.
Claim 4
Dependent Claim
21 words
An optical device as recited in claim 1 in which said waveguide is supported by a Group III-V compound semiconductor substrate.
Claim 5
Dependent Claim
22 words
An optical device as recited in claim 3 in which said substrate is oriented along the (100), (110), or (111) crystal directions.
Claim 6
Dependent Claim
27 words
An optical device as recited in claim 1 in which said electro-optic material is selected from the group consisting of Group III-V and Group II-VI semiconductor compounds.
Claim 7
Dependent Claim
34 words
An optical device as recited in claim 5 in which said electro-optic material comprises Al x Ga 1-x As, x being greater than or equal to 0.0 and less than or equal to 1.0.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-12-25 | 1993-06-26 | 1993-12-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-12-25 | 1997-06-26 | 1997-12-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-12-25 | 2001-06-26 | 2001-12-26 | $7700.00 | Window Closed / Lapsed |