US4701930A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Distributed feedback semiconductor laser
Assignee: KDDI Corp
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Filing: 1985-08-09
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Granted: 1987-10-20
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Expires: 2005-08-09
Abstract
Abstract A distributed feedback semiconductor laser, in which the periodic corrugations in the first region and the second region of the light emitting region of the DFB laser have different lengths or depths to make the intensities of the Bragg reflection of the first region and the second region different from each other, thereby obtaining asymmetrical light outputs from the both sides of the DFB laser.
Inventors
- 👤 Shigeyuki Akiba
- 👤 Katsuyuki Utaka
- 👤 Kazuo Sakai
- 👤 Yuichi Matsushima
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 03:49
CPC Classifications
H; H01; H01S; H01S5/00; H01S5/10; H01S5/16; H01S5/164; H01S5/12; H01S5/124
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
137 words
A distributed feedback laser having a substrate, a DFB portion on said substrate comprising a light emitting layer and an adjoining layer having periodic corrugations extending in the direction of travel of light, and electrodes for effecting laser oscillations, a first DFB region and a second DFB region of said DFB portion contiguous with said first DFB region having laser light outputs asymmetrical in magnitude, the first DFB region and the second DFB region having means comprising the periodic corrugations therein for making Bragg reflections of the first DFB region different from the second DFB region so that said laser light outputs thereof are asymmetrical in magnitude, and the periodic corrugations having a phase shift between the first DFB region and the second DFB region by a value corresponding to one fourth of the wavelength of light.
Claim 2
Dependent Claim
137 words
A distributed feedback laser having a substrate, a DFB portion on said substrate comprising a light emitting layer and an adjoining layer having periodic corrugations extending in the direction of travel of light, and electrodes for effecting laser oscillations, a first DFB region and a second DFB region of said DFB portion contiguous with said first DFB region having laser light outputs asymmetrical in magnitude, the first DFB region and the second DFB region having means comprising the periodic corrugations therein for making Bragg reflections of the first DFB region different from the second DFB region so that said laser light outputs thereof are asymmetrical in magnitude, and the periodic corrugations having a phase shift between the first DFB region and the second DFB region by a value corresponding to one fourth of the wavelength of light.
Claim 3
Dependent Claim
142 words
A distributed feedback laser having a substrate, a DFB portion of said substrate comprising a light emitting layer and an adjoining layer having periodic corrugations extending in the direction of travel of light, and electrodes for effecting laser oscillations, a first DFB region of said portion and a second DFB region of said DFB portion contiguous with said first DFB region having the periodic corrugation therein differing in length from each other to effectively make the intensities of Bragg reflection of the first DFB region differ from that of the second DFB region so that laser light outputs of the first DFB region and the second DFB region are asymmetrical in magnitude, and the periodic corrugations having a phase shift between the first DFB region and the second DFB region by a value corresponding to one fourth of the wavelength of light.
Claim 4
Dependent Claim
142 words
A distributed feedback laser having a substrate, a DFB portion of said substrate comprising a light emitting layer and an adjoining layer having periodic corrugations extending in the direction of travel of light, and electrodes for effecting laser oscillations, a first DFB region of said portion and a second DFB region of said DFB portion contiguous with said first DFB region having the periodic corrugation therein differing in length from each other to effectively make the intensities of Bragg reflection of the first DFB region differ from that of the second DFB region so that laser light outputs of the first DFB region and the second DFB region are asymmetrical in magnitude, and the periodic corrugations having a phase shift between the first DFB region and the second DFB region by a value corresponding to one fourth of the wavelength of light.
Claim 5
Dependent Claim
134 words
A distributed feedback laser having a substrate, a DFB portion on said substrate comprising a light emitting layer and an adjoining layer having periodic corrugations extending in the direction of travel of light, and electrodes for effecting laser oscillations, a first DFB region of said portion and a second DFB region of said DFB portion contiguous with said first DFB region having the periodic corrugations therein differing in depth from each other effective to make the intensities of Bragg reflection different from each other in the DFB regions so that laser light outputs of the first and second DFB regions are asymmetrical in magnitude, and the periodic corrugations having a phase shift between the first DFB region and the second DFB region by a value corresponding to one fourth of the wavelength of light.
Claim 6
Dependent Claim
134 words
A distributed feedback laser having a substrate, a DFB portion on said substrate comprising a light emitting layer and an adjoining layer having periodic corrugations extending in the direction of travel of light, and electrodes for effecting laser oscillations, a first DFB region of said portion and a second DFB region of said DFB portion contiguous with said first DFB region having the periodic corrugations therein differing in depth from each other effective to make the intensities of Bragg reflection different from each other in the DFB regions so that laser light outputs of the first and second DFB regions are asymmetrical in magnitude, and the periodic corrugations having a phase shift between the first DFB region and the second DFB region by a value corresponding to one fourth of the wavelength of light.
References Cited (Backward Citations)
US4096446A
Cited
US4665528A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-10-19 | 1991-04-20 | 1991-10-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-10-19 | 1995-04-20 | 1995-10-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-10-19 | 1999-04-20 | 1999-10-20 | $7700.00 | Window Closed / Lapsed |