Patent US5220578A successfully refreshed from Google Patents.
US5220578A
Expired / Lapsed
US
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Long term mode stabilization for distributed bragg reflector laser
Assignee: Nokia Bell Labs
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Filing: 1991-11-01
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Granted: 1993-06-15
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Expires: 2011-11-01
Abstract
Abstract A light transmitter comprising a distributed Bragg reflector laser and mode stabilization feedback means is described for maintaining the laser in single longitudinal mode operation.
Inventors
- 👤 Thomas L. Koch
- 👤 Sheryl L. Woodward
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 23:13
CPC Classifications
H; H01; H01S; H01S5/00; H01S5/06; H01S5/068; H01S5/0683; H01S5/0687; H04; H04B; H04B10/00; H04B10/50; H04B10/501; H04B10/503; H04B10/572; H01S5/02; H01S5/026; H01S5/0262; H01S5/0264; H01S5/062; H01S5/0625; H01S5/06255; H01S5/06256
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
74 words
A lightwave transmitter comprising: a multi-section distributed Bragg reflector laser comprising a gain section and a Bragg section having an effective period, means for measuring at least one characteristic of light output from said Bragg section with respect to current applied through said Bragg section, and feedback means responsive to said at least one characteristic for controllably adjusting said effective period of said Bragg section to maintain laser output at a desired spectral value.
Claim 2
Dependent Claim
74 words
A lightwave transmitter comprising: a multi-section distributed Bragg reflector laser comprising a gain section and a Bragg section having an effective period, means for measuring at least one characteristic of light output from said Bragg section with respect to current applied through said Bragg section, and feedback means responsive to said at least one characteristic for controllably adjusting said effective period of said Bragg section to maintain laser output at a desired spectral value.
Claim 3
Dependent Claim
33 words
The lightwave transmitter as defined in claim 1 in which said at least one characteristic comprises the first derivative of the light output intensity with respect to said current through said Bragg section.
Claim 4
Dependent Claim
23 words
The lightwave transmitter as defined in claim 2 in which said feedback means maintains said first derivative at a value of approximately zero.
Claim 5
Dependent Claim
34 words
The lightwave transmitter as defined in claim 3 in which said feedback means maintains the value of approximately zero at a local maximum in the light output power versus Bragg section current characteristic curve.
Claim 6
Dependent Claim
45 words
The lightwave transmitter as defined in claim 4 wherein said Bragg section includes a diffraction grating having said effective period, said lightwave transmitter further comprising means for adjusting the Bragg section current to said Bragg section to control said effective period of said diffraction grating.
Claim 7
Dependent Claim
19 words
The lightwave transmitter as defined in claim 1 wherein said at least one characteristic comprises the light output intensity.
Claim 8
Dependent Claim
30 words
The lightwave transmitter as defined in claim 6 wherein said feedback means maintains said characteristic at a local maximum in the light output power versus Bragg section current characteristic curve.
Claim 9
Dependent Claim
45 words
The lightwave transmitter as defined in claim 4 wherein said Bragg section includes a diffraction grating having said effective period, said lightwave transmitter further comprising means for adjusting the Bragg section current to said Bragg section to control said effective period of said diffraction grating.
Claim 10
Dependent Claim
34 words
The lightwave transmitter as defined in claim 3 in which said feedback means maintains the value of approximately zero at a local minimum in the light output power versus Bragg section current characteristic curve.
Claim 11
Dependent Claim
45 words
The lightwave transmitter as defined in claim 9 wherein said Bragg section includes a diffraction grating having an effective period, said lightwave transmitter further comprising means for adjusting the Bragg section current to said Bragg section to control said effective period of said diffraction grating.
Claim 12
Dependent Claim
30 words
The lightwave transmitter as defined in claim 6 wherein said feedback means maintains said characteristic at a local maximum in the light output power versus Bragg section current characteristic curve.
Claim 13
Dependent Claim
45 words
The lightwave transmitter as defined in claim 11 wherein said Bragg section includes a diffraction grating having an effective period, said lightwave transmitter further comprising means for adjusting the Bragg section current to said Bragg section to control said effective period of said diffraction grating.
References Cited (Backward Citations)
US4785454A
Cited
US5119393A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1996-06-14 | 1996-12-14 | 1997-06-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-06-14 | 2000-12-14 | 2001-06-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-06-14 | 2004-12-14 | 2005-06-15 | $7700.00 | Window Closed / Lapsed |