US4826282A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Optical communications laser including a resonator filter
Assignee: Nokia Bell Labs
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Filing: 1987-07-21
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Granted: 1989-05-02
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Expires: 2007-07-21
Abstract
Abstract A structure of first and second grating sections separated by a phase-shift section serves as a narrow-band resonator filter. Such structure may be optically coupled to a semiconductor laser cavity, and the resulting assembly can serve as a tunable narrow-linewidth laser, e.g., in wavelength-multiplexed and coherent-lightwave communications systems.
Inventors
- 👤 Rodney C. Alferness
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 21:17
CPC Classifications
H; H01; H01S; H01S5/00; H01S5/10; H01S5/1028; G; G02; G02B; G02B6/00; G02B6/10; G02B6/12; G02B6/122; G02B6/124; G02F; G02F1/00; G02F1/01; G02F1/21; G02F1/225; H01S5/1032; H01S5/12; G02B2006/12083; G02B2006/12107; G02B2006/12109; H01S5/06; H01S5/062; H01S5/0625; H01S5/06255; H01S5/06256; H01S5/06258; H01S5/1228; Y; Y10; Y10S; Y10S359/00; Y10S359/90
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
64 words
An optical communications laser, said laser comprising a substrate-supported layer which is capable of emitting light and which is situated between first and second means for providing optical feedback in said layer, means for supplying an electrical current to said layer, and a resonator filter element in optical coupling relationship with said layer, said resonator filter element comprising spaced-apart first and second grating sections.
Claim 2
Dependent Claim
64 words
An optical communications laser, said laser comprising a substrate-supported layer which is capable of emitting light and which is situated between first and second means for providing optical feedback in said layer, means for supplying an electrical current to said layer, and a resonator filter element in optical coupling relationship with said layer, said resonator filter element comprising spaced-apart first and second grating sections.
Claim 3
Dependent Claim
31 words
The laser of claim 1, the material of said resonator filter element having a bandgap which is less than the bandgap of the material of said layer capable of emitting light.
Claim 4
Dependent Claim
18 words
The laser of claim 1, further comprising electrical means for adjusting the resonant wavelength of said filter element.
Claim 5
Dependent Claim
26 words
The laser of claim 1, said resonator filter element comprising means for adjusting the refractive index in the space between said first and second grating sections.
Claim 6
Dependent Claim
16 words
The laser of claim 4, said means for adjusting the refractive index comprising an electrical contact.
Claim 7
Dependent Claim
12 words
The laser of claim 4, said sections comprising a compound semiconductor material.
Claim 8
Dependent Claim
14 words
The laser of claim 6, said compound semiconductor material comprising a Group III-V material.
Claim 9
Dependent Claim
10 words
The laser of claim 4, said sections comprising lithium noibate.
Claim 10
Dependent Claim
9 words
The laser of claim 4, said sections comprising silica.
Claim 11
Independent Claim
60 words
A method for optical communications, said method comprising operating a communications laser at or near a specific wavelength, the wavelength of said laser being tuned to said specified wavelength by means of a resonator filter which is optically coupled to a laser-active layer between first and second feedback-producing means, said resonator filter element comprising spaced-apart first and second grating sections.
Claim 12
Independent Claim
60 words
A method for optical communications, said method comprising operating a communications laser at or near a specific wavelength, the wavelength of said laser being tuned to said specified wavelength by means of a resonator filter which is optically coupled to a laser-active layer between first and second feedback-producing means, said resonator filter element comprising spaced-apart first and second grating sections.
References Cited (Backward Citations)
US4309667A
Cited
US4532632A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1992-05-01 | 1992-10-31 | 1993-05-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-05-01 | 1996-10-31 | 1997-05-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-05-01 | 2000-10-31 | 2001-05-02 | $7700.00 | Window Closed / Lapsed |