US5315676A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Optical waveguide device
Assignee: Fujifilm Holdings Corp
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Filing: 1993-09-08
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Granted: 1994-05-24
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Expires: 2013-09-08
Abstract
Abstract An optical waveguide device comprises an optical waveguide for guiding an optical wave therethrough, and a grating coupler located on a surface of the optical waveguide in order to radiate the guided optical wave, which travels in the optical waveguide, out of the optical waveguide. The grating coupler is provided with a plurality of bars, the heights h of which increase approximately linearly and little by little in the direction along which the guided optical wave travels. The inclination b of the variation of the bar heights h satisfies the condition ##EQU1## where a represents a coefficient which determines a radiation loss coefficient α (α=ah m , where 2<m), and L represents the length of the grating coupler, which length is taken in the direction along which the guided optical wave travels. The guided optical wave is radiated very efficiently as an approximately Gaussian beam out of the optical waveguide, or an external optical wave, which takes on the form of a Gaussian beam, is introduced very efficiently into the optical waveguide.
Inventors
- 👤 Hiroshi Sunagawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 23:15
CPC Classifications
G; G02; G02B; G02B6/00; G02B6/10; G02B6/12; G02B6/122; G02B6/124; G02B6/24; G02B6/26; G02B6/34
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
153 words
An optical waveguide device comprising: i) an optical waveguide for guiding an optical wave therethrough, and ii) a grating coupler located on a surface of the optical waveguide in order to radiate the guided optical wave, which travels in the optical waveguide, out of the optical waveguide, wherein the grating coupler is provided with a plurality of bars each bar having a height h, the heights h of the bars gradually and approximately linearly increase relative to each other in the direction along which the guided optical wave travels, and each bar having an inclination b relative to the direction along the heights of the bars, the inclination b satisfies the condition ##EQU24## where a represents a coefficient which determines a radiation loss coefficient α (α=ah m , where 2<m), and L represents the length of the grating coupler, which length is taken in the direction along which the guided optical wave travels.
Claim 2
Dependent Claim
153 words
An optical waveguide device comprising: i) an optical waveguide for guiding an optical wave therethrough, and ii) a grating coupler located on a surface of the optical waveguide in order to radiate the guided optical wave, which travels in the optical waveguide, out of the optical waveguide, wherein the grating coupler is provided with a plurality of bars each bar having a height h, the heights h of the bars gradually and approximately linearly increase relative to each other in the direction along which the guided optical wave travels, and each bar having an inclination b relative to the direction along the heights of the bars, the inclination b satisfies the condition ##EQU24## where a represents a coefficient which determines a radiation loss coefficient α (α=ah m , where 2<m), and L represents the length of the grating coupler, which length is taken in the direction along which the guided optical wave travels.
Claim 3
Dependent Claim
17 words
An optical waveguide device as defined in claim 1 wherein the optical wave is a laser beam.
Claim 4
Dependent Claim
18 words
An optical waveguide device as defined in claim 1 wherein the grating coupler is a linear grating coupler.
Claim 5
Dependent Claim
18 words
An optical waveguide device as defined in claim 1 wherein the grating coupler is a focusing grating coupler.
Claim 6
Dependent Claim
146 words
An optical waveguide device comprising: i) an optical waveguide for guiding an optical wave therethrough, and ii) a grating coupler located on a surface of the optical waveguide in order to introduce an external optical wave into the optical waveguide, wherein the grating coupler is provided with a plurality of bars, each bar having a height h the heights h of the bars gradually and approximately linearly decrease relative to each other in the direction along which the guided optical wave travels, and each bar having an inclination b relative to the direction along the heights of the bars, the inclination b satisfies the condition ##EQU25## where a represents a coefficient which determines a radiation loss coefficient α (α=ah m , where 2<m), and L represents the length of the grating coupler, which length is taken in the direction along which the guided optical wave travels.
Claim 7
Dependent Claim
146 words
An optical waveguide device comprising: i) an optical waveguide for guiding an optical wave therethrough, and ii) a grating coupler located on a surface of the optical waveguide in order to introduce an external optical wave into the optical waveguide, wherein the grating coupler is provided with a plurality of bars, each bar having a height h the heights h of the bars gradually and approximately linearly decrease relative to each other in the direction along which the guided optical wave travels, and each bar having an inclination b relative to the direction along the heights of the bars, the inclination b satisfies the condition ##EQU25## where a represents a coefficient which determines a radiation loss coefficient α (α=ah m , where 2<m), and L represents the length of the grating coupler, which length is taken in the direction along which the guided optical wave travels.
Claim 8
Dependent Claim
17 words
An optical waveguide device as defined in claim 5 wherein the optical wave is a laser beam.
Claim 9
Dependent Claim
18 words
An optical waveguide device as defined in claim 5 wherein the grating coupler is a linear grating coupler.
Claim 10
Dependent Claim
18 words
An optical waveguide device as defined in claim 5 wherein the grating coupler is a focusing grating coupler.
References Cited (Backward Citations)
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JPH01107213A
Cited
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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) | 1997-05-23 | 1997-11-22 | 1998-05-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-05-23 | 2001-11-22 | 2002-05-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-05-23 | 2005-11-22 | 2006-05-24 | $7700.00 | Window Closed / Lapsed |