US4802187A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Distributed feedback semiconductor laser of continuously tunable wavelength
Assignee: Oclaro North America Inc
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Filing: 1987-05-05
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Granted: 1989-01-31
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Expires: 2007-05-05
Abstract
Abstract A distributed feedback semiconductor laser comprising a substrate and, on such substrate, a double heterostructure formed by a confinement layer, an active layer, a guiding layer engraved to form a diffraction network, the active layer and the guiding layer being engraved to form a ribbon having a certain width and a certain thickness and a central portion of larger width and thickness, a metal electrode surmounting the assembly and enabling charges to be injected through the ribbon, wherein the metal electrode comprises two distinct portions forming a first electrode disposed above the central widened or thickened portion of the ribbon, the first electrode being connected to a first connection for the injection of a first current and a second electrode disposed above the rest of the ribbon and connected to a second connection for the injection of a second current.
Inventors
- 👤 Jean-Claude Bouley
- 👤 Pascal Correc
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 12:48
CPC Classifications
H; H01; H01S; H01S5/00; H01S5/06; H01S5/062; H01S5/0625; H01S5/06255; H01S5/06258; H01S5/20; H01S5/22; H01S5/227; H01S5/06209; H01S5/06213; H01S5/10; H01S5/1053; H01S5/1064; H01S5/12; H01S5/124; H01S5/1243; H01S5/2275
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
157 words
A distributed feedback semiconductor laser comprising: a metal electrode; a substrate on said metal electrode; a double heterostructure on said substrate formed by a confinement layer on said substrate, an active layer on said confinement layer, and a guiding layer engraved to form a diffraction network on said active layer, the active layer and the guiding layer forming a ribbon having a certain width and a certain thickness and a central portion of larger at least one of width and thickness; and another metal electrode surmounting the heterostructure enabling charges to be injected through the ribbon, wherein said another metal electrode comprises two distinct portions forming a first electrode disposed above the central portion of the ribbon, the first electrode being connected to a first connection for the injection of a first current and a second electrode disposed above the rest of the ribbon and connected to a second connection for the injection of a second current.
Claim 2
Dependent Claim
157 words
A distributed feedback semiconductor laser comprising: a metal electrode; a substrate on said metal electrode; a double heterostructure on said substrate formed by a confinement layer on said substrate, an active layer on said confinement layer, and a guiding layer engraved to form a diffraction network on said active layer, the active layer and the guiding layer forming a ribbon having a certain width and a certain thickness and a central portion of larger at least one of width and thickness; and another metal electrode surmounting the heterostructure enabling charges to be injected through the ribbon, wherein said another metal electrode comprises two distinct portions forming a first electrode disposed above the central portion of the ribbon, the first electrode being connected to a first connection for the injection of a first current and a second electrode disposed above the rest of the ribbon and connected to a second connection for the injection of a second current.
Claim 3
Dependent Claim
35 words
A laser according to claim 1, wherein the ribbon is buried in a first epitaxial layer and a second epitaxial layer surmounts a portion of the first epitaxial layer forming a mesa over the ribbon.
Claim 4
Dependent Claim
14 words
A laser according to claim 2, wherein a first metal layer surmounts the mesa.
Claim 5
Dependent Claim
57 words
A laser according to claim 3, wherein the first and second electrodes are formed by a second metal layer on the first epitaxial layer and the first metal layer, an ohmic contact being formed between the first and second metal layers and a Schottky contact being formed between the second metal layer and the first epitaxial layer.
Claim 6
Dependent Claim
22 words
A laser according to claim 1, wherein the central portion is engraved in a diffraction network, like the rest of the ribbon.
Claim 7
Dependent Claim
16 words
A ribbon according to claim 1, wherein the central portion is not engraved in a network.
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) | 1992-01-31 | 1992-08-01 | 1993-01-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-01-31 | 1996-08-01 | 1997-01-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-01-31 | 2000-08-01 | 2001-01-31 | $7700.00 | Window Closed / Lapsed |