US6122306A
Expired / Lapsed
US
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Self-pulsing multi-section laser
Assignee: Fraunhofer-Gesellschaft zur Förderung der Angewandten Forschung eV
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Filing: 1996-03-29
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Granted: 2000-09-19
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Expires: 2016-03-29
Abstract
Abstract In a self-pulsing multi-section laser having two DFB sections, a Fabry-Perot-like resonator formed from two reflectors and a spacer is integrated into the multi-section laser and optically coupled to at least one DFB section. The spacer has a similar layer structure to the adjacent DFB sections (D 1 and D 2 ) but not DFB grid and takes the form of a control section operable electrically separated from the DFB sections. Selection is unnecessary. The self-pulsing two-section DFB laser of the invention with an integrated control section is suitable for optical beat regeneration in high-rate communication systems.
Inventors
- 👤 Bernd Sartorius
- 👤 Martin Moehrle
- 👤 Uwe Feiste
- 👤 Juergen Hoerer-Dragendorf
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 17:05
CPC Classifications
H; H01; H01S; H01S5/00; H01S5/06; H01S5/062; H01S5/0625; H01S5/06226; H01S5/0623; H01S5/065; H01S5/0658
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
60 words
A self-pulsing multi-section laser, comprising: electrically energizable first and second distributive feedback (DFB) sections provided with DFB gratings; and a control section electrically energizable independently of and optically coupled to at least one of the first and second DFB sections and comprising a spacer and first and second reflectors to form a Fabry-Perot-like resonator for selectively generating a self-pulsing mode.
Claim 2
Dependent Claim
60 words
A self-pulsing multi-section laser, comprising: electrically energizable first and second distributive feedback (DFB) sections provided with DFB gratings; and a control section electrically energizable independently of and optically coupled to at least one of the first and second DFB sections and comprising a spacer and first and second reflectors to form a Fabry-Perot-like resonator for selectively generating a self-pulsing mode.
Claim 3
Dependent Claim
16 words
The self-pulsing multi-section laser according to claim 1, wherein said spacer comprises a passive control section.
Claim 4
Dependent Claim
32 words
The self-pulsing multi-section laser according to claim 2, wherein said passive control section is positioned intermediate one of said first and second distributed feedback sections and a facet limiting said multi-section laser.
Claim 5
Dependent Claim
22 words
The self-pulsing multi-section laser according to claim 2, wherein said passive control is positioned intermediate said first and second distributed feedback sections.
Claim 6
Dependent Claim
16 words
The self-pulsing multi-section laser according to claim 1, wherein said spacer comprises an active control section.
Claim 7
Dependent Claim
21 words
The self-pulsing multi-section laser according to claim 5, wherein said spacer is positioned intermediate said first and second distributed feedback sections.
Claim 8
Dependent Claim
24 words
The self-pulsing multi-section laser according to claim 6, wherein said first and second distributed feedback sections and said spacer comprise substantially identical active layers.
Claim 9
Dependent Claim
30 words
The self-pulsing multi-section laser according to claim 1, wherein said spacer means comprises separately electrically energizable active and passive control sections positioned intermediate said first and second distributed feedback sections.
Claim 10
Dependent Claim
30 words
The self-pulsing multi-section laser according to claim 1, wherein the gratings of the first and second distributed feedback sections are detuned in the Bragg wavelength with respect to each other.
Claim 11
Dependent Claim
25 words
The self-pulsing multi-section laser according to claim 1, wherein said gratings of said first and second Distributed feedback sections have coupling coefficients of different values.
Claim 12
Dependent Claim
72 words
The self-pulsing multi-section laser according to claim 1, wherein said multi-section laser comprises a fin wave guide structure having an elevated center strip and comprising a plurality of layers, including, from bottom to top: a base electrode layer; an n-InP substrate; an n-1.3 μm-InGaAsP waveguide layer; a 1.55 μm-InGaAsP active layer; a p-1.18 μm-InGaAsP waveguide layer; a p-InP layer; an SiN x layer open only at the fin; and an electrode layer.
Claim 13
Dependent Claim
21 words
The self-pulsing multi-section laser according to claim 11, further comprising a p-InGaAs layer at said center strip for reducing contact resistance.
Claim 14
Dependent Claim
56 words
The self-pulsing multi-section laser according to claim 12, wherein said n-1.3 μm-InGaAsP waveguide layer has a thickness of 300 nm, said p-1.18 μm-InGaAsP waveguide layer has a thickness of 150 nm, said 1.55 μm-InGaAsP active layer has a thickness of 150 nm and said p-InGaAs layer on said center strip has a thickness of 400 nm.
Claim 15
Dependent Claim
32 words
The self-pulsing multi-section laser according to claim 13, wherein said first and second distributed feedback sections each have a length of 200 μm and said spacer has a length of 400 μm.
Claim 16
Dependent Claim
25 words
The self-pulsing multi-section laser according to claim 11, wherein said gratings are inscribed by electron beam lithography and etched into said p-1.18 μm-InGaAsP waveguide layer.
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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) | 2003-09-19 | 2004-03-20 | 2004-09-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2007-09-19 | 2008-03-20 | 2008-09-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2011-09-19 | 2012-03-20 | 2012-09-19 | $7700.00 | Window Closed / Lapsed |