US4622672A
Expired / Lapsed
US
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Self-stabilized semiconductor lasers
Assignee: Nokia Bell Labs
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Filing: 1984-01-20
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Granted: 1986-11-11
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Expires: 2004-01-20
Abstract
Abstract A control circuit for stabilizing the emission wavelength of the coupled cavity semiconductor laser is described which uses measurements of the voltage across the laser cavity to maintain stable single longitudinal mode output.
Inventors
- 👤 Larry A. Coldren
- 👤 Karl J. Ebeling
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 16:35
CPC Classifications
H; H01; H01S; H01S5/00; H01S5/10; H01S5/1021; H01S5/0014; H01S5/0028; H01S5/06; H01S5/068; H01S5/06808; H01S5/0683; H01S5/0687
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
62 words
A wavelength-stabilized semiconductor laser comprising a laser cavity, a second cavity, said laser cavity and said second cavity being optically coupled to each other, means for measuring a voltage variation across the laser cavity, means for comparing the measured voltage to a reference characteristic, and means for varying a property of said second cavity by an amount determined by said comparing step.
Claim 2
Dependent Claim
62 words
A wavelength-stabilized semiconductor laser comprising a laser cavity, a second cavity, said laser cavity and said second cavity being optically coupled to each other, means for measuring a voltage variation across the laser cavity, means for comparing the measured voltage to a reference characteristic, and means for varying a property of said second cavity by an amount determined by said comparing step.
Claim 3
Dependent Claim
23 words
A laser as recited in claim 1 in which said laser comprises a coupled cavity laser and said second cavity comprises an etalon.
Claim 4
Dependent Claim
19 words
A laser as recited in claim 2 in which said means for varying changes the current to the etalon.
Claim 5
Dependent Claim
22 words
A laser as recited in claim 1 in which said second cavity comprises an external cavity optically coupled to said laser cavity.
Claim 6
Dependent Claim
21 words
A laser as recited in claim 4 in which said means for varying changes the optical length of said external cavity.
Claim 7
Dependent Claim
30 words
A laser as recited in claim 1 in which said means for measuring comprises a reference oscillator and a phase-sensitive detector electrically connected to said laser and to said oscillator.
Claim 8
Dependent Claim
31 words
A laser as recited in claim 6 in which said means for comparing comprises an amplifier having an input from said detector and a reference input, said amplifier having an output.
Claim 9
Dependent Claim
19 words
A laser as recited in claim 7 in which said means for varying comprises the output of said amplifier.
Claim 10
Dependent Claim
23 words
A laser as recited in claim 8 in which said laser comprises a coupled cavity laser and said second cavity comprises an etalon.
Claim 11
Dependent Claim
19 words
A laser as recited in claim 9 in which said means for varying changes the current to the etalon.
Claim 12
Dependent Claim
22 words
A laser as recited in claim 8 in which said second cavity comprises an external cavity optically coupled to said laser cavity.
Claim 13
Dependent Claim
21 words
A laser as recited in claim 11 in which said means for varying changes the optical length of said external cavity.
References Cited (Backward Citations)
No citation records indexed.
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) | 1989-11-10 | 1990-05-12 | 1990-11-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-11-10 | 1994-05-12 | 1994-11-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-11-10 | 1998-05-12 | 1998-11-11 | $7700.00 | Window Closed / Lapsed |