US4904045A
Expired / Lapsed
US
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Grating coupler with monolithically integrated quantum well index modulator
Assignee: Nokia Bell Labs
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Filing: 1988-03-25
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Granted: 1990-02-27
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Expires: 2008-03-25
Abstract
Abstract A grating coupler is combined with a quantum well index modulator and an optical waveguide to alter the reverse or forward coupling characteristics between two different propagation modes of the system.
Inventors
- 👤 Rodney C. Alferness
- 👤 Thomas L. Koch
- 👤 Uziel Koren
- 👤 Jane E. Zucker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 04:08
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/015; B; B82; B82Y; B82Y20/00; G02F1/017; G02F1/01708; G02F1/29; G02F1/31; G02F1/313; G02F1/3132; G02F1/3133; H; H01; H01S; H01S5/00; H01S5/10; H01S5/1028; H01S5/1032; H01S5/30; H01S5/34; H01S5/343; H01S5/34313; G02F1/0151; G02F1/3135; G02F2201/00; G02F2201/30; G02F2201/302; G02F2202/00; G02F2202/10; G02F2202/101; G02F2202/102; G02F2203/00; G02F2203/05; G02F2203/055; H01S5/06; H01S5/062; H01S5/0625; H01S5/06255; H01S5/06256; H01S5/06258; H01S5/1035; H01S5/34306; H01S5/50; H01S5/5045
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
65 words
A device comprising (a) a quantum well structure, (b) a guided wave structure, and (c) a grating coupler designed to couple at least two propagation modes of the guided wave structure, the invention characterized in that, the grating coupler has a pitch which yields phase matched grating coupling in a wavelength range which is energetically substantially below the absorption edge of the quantum well device.
Claim 2
Independent Claim
65 words
A device comprising (a) a quantum well structure, (b) a guided wave structure, and (c) a grating coupler designed to couple at least two propagation modes of the guided wave structure, the invention characterized in that, the grating coupler has a pitch which yields phase matched grating coupling in a wavelength range which is energetically substantially below the absorption edge of the quantum well device.
Claim 3
Dependent Claim
16 words
The device of claim 1 wherein the quantum well structure comprises more than one quantum well.
Claim 4
Dependent Claim
27 words
The device of claim 2 further comprising a source of optical radiation of a wavelength which is substantially below the absorption edge of the quantum well device.
Claim 5
Dependent Claim
20 words
The device of claim 1 wherein the quantum well device is located within the cavity of a distributed feedback laser.
Claim 6
Dependent Claim
51 words
The device of claim 1 wherein the grating, the quantum well, and the waveguiding structure are oriented so that the forward and reverse versions of a particular optical mode of the waveguiding structure spatially overlap both the grating and the quantum well structure thereby yielding a tunable quantum well Bragg reflector.
Claim 7
Dependent Claim
63 words
The device of claim 1 wherein the grating, the quantum well, and the waveguiding structure are oriented so that the forward version of a particular optical mode of the waveguiding structure and the backward version of a different particular optical mode of the waveguiding structure spatially overlap both the grating and the quantum well structure thereby yielding a tunable, reverse coupling grating filter.
Claim 8
Dependent Claim
64 words
The device of claim 1 wherein the grating, the quantum well, and the waveguiding structure are oriented so that a forward version of a first particular optical mode of the waveguiding structure and a forward version of a second particular optical mode of the waveguiding structure spatially overlap both the grating and the quantum well structure thereby yielding a tunable, forward coupling grating filter.
Claim 9
Dependent Claim
21 words
The device of claim 1 wherein the grating coupler is spatially separated along the waveguide direction from the quantum well device.
Claim 10
Dependent Claim
36 words
The device of claim 1 wherein the grating coupler has a pitch which yields phase-matched grating coupling in a wavelength range which is energetically greater than 5Γ below the absorption edge of the quantum well device.
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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) | 1993-02-26 | 1993-08-28 | 1994-02-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-02-26 | 1997-08-28 | 1998-02-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-02-26 | 2001-08-28 | 2002-02-27 | $7700.00 | Window Closed / Lapsed |