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US4898440A
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Optical waveguide device
Assignee: Sony Corp
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Filing: 1988-09-14
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Granted: 1990-02-06
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Expires: 2008-09-14
Abstract
Abstract An optical waveguide device is disclosed which utilizes an interaction between a guided optical wave and a magnetostatic wave. The optical waveguide device comprises a layer of bismuth substituted magnetic garnet which guides an optical wave. A pair of electrodes coupled to the layer of the magnetic garnet generates a magnetostatic backward volume wave in the layer of the magnetic garnet under an application of a certain bias magnetic field. The guided optical wave and the magnetostatic wave interact with each other wherein adverse effect caused by a spin effect is avoided to realize high efficiency at high frequency.
Inventors
- 👤 Hitoshi Tamada
- 👤 Masahiko Kaneko
- 👤 Tsutomu Okamoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-10 01:45
CPC Classifications
H; H01; H01F; H01F10/00; H01F10/08; H01F10/10; H01F10/18; H01F10/20; H01F10/24; H01F10/245; G; G02; G02F; G02F1/00; G02F1/01; G02F1/09; G02F1/095
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
113 words
An optical waveguide device comprising: (a) a layer of bismuth substituted magnetic garnet having a major surface; (b) a pair of electrodes provided on said major surface applied with a microwave; (c) means for applying a bias magnetic field in parallel to said major surface along a direction from one electrode to another electrode; (d) optical input and output portions coupled to said layer to guide an optical wave therebetween, wherein said optical wave interacts with a magnetostatic backward volume wave generated by application of a microwave to said pair of electrodes with said bias magnetic field; and wherein said bismuth substituted magnetic garnet contains not less than 0.225 formula unit of Bi.
Claim 2
Dependent Claim
113 words
An optical waveguide device comprising: (a) a layer of bismuth substituted magnetic garnet having a major surface; (b) a pair of electrodes provided on said major surface applied with a microwave; (c) means for applying a bias magnetic field in parallel to said major surface along a direction from one electrode to another electrode; (d) optical input and output portions coupled to said layer to guide an optical wave therebetween, wherein said optical wave interacts with a magnetostatic backward volume wave generated by application of a microwave to said pair of electrodes with said bias magnetic field; and wherein said bismuth substituted magnetic garnet contains not less than 0.225 formula unit of Bi.
Claim 3
Dependent Claim
28 words
An optical waveguide device according to claim 1, wherein said layer of bismuth substituted magnetic garnet is formed on a nonmagnetic GGG substrate by liquid phase epitaxial growth.
Claim 4
Dependent Claim
114 words
An optical waveguide device comprising: (a) a layer of bismuth substituted magnetic garnet having a major surface; (b) a pair of electrodes provided on said major surface applied with a microwave; (c) means for applying a bias magnetic field in parallel to said major surface along a direction from one electrode to another electrode; (d) optical input and output portions coupled to said layer to guide an optical wave therebetween, wherein said optical wave interacts with a magnetostatic backward volume wave generated by application of a microwave to said pair of electrodes with said bias magnetic field; and wherein said layer of bismuth substituted magnetic garnet is (LuBi) 3 (FeMg) 5 O 12 .
Claim 5
Dependent Claim
114 words
An optical waveguide device comprising: (a) a layer of bismuth substituted magnetic garnet having a major surface; (b) a pair of electrodes provided on said major surface applied with a microwave; (c) means for applying a bias magnetic field in parallel to said major surface along a direction from one electrode to another electrode; (d) optical input and output portions coupled to said layer to guide an optical wave therebetween, wherein said optical wave interacts with a magnetostatic backward volume wave generated by application of a microwave to said pair of electrodes with said bias magnetic field; and wherein said layer of bismuth substituted magnetic garnet is (LuBi) 3 (FeMg) 5 O 12 .
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-02-05 | 1993-08-07 | 1994-02-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-02-05 | 1997-08-07 | 1998-02-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-02-05 | 2001-08-07 | 2002-02-06 | $7700.00 | Window Closed / Lapsed |