Patent US4796996A successfully refreshed from Google Patents.
US4796996A
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Laser temperature modulation and detection method
Assignee: Nokia Bell Labs
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Filing: 1987-08-14
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Granted: 1989-01-10
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Expires: 2007-08-14
Abstract
Abstract Periodically modulating the temperature of a semiconductor laser while maintaining constant optical power permits very precise measurements of the operating parameters of the laser.
Inventors
- 👤 Matthew J. Burns
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 22:04
CPC Classifications
H; H01; H01S; H01S5/00; H01S5/0014; G; G01; G01D; G01D5/00; G01D5/26; G01D5/266; H01S5/06; H01S5/0607; H01S5/0612; H01S5/062; H01S5/06209; H01S5/0622; H01S5/068; H01S5/0683
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
82 words
A method of measuring a parameter of a system comprising a semiconductor laser comprising the steps of: periodically cycling the emission wavelength of said semiconductor laser; monitoring the optical power from a first face of said laser; using a feedback control system to maintain said optical power from said first face at a constant level; emitting light from said laser into an optical cavity which is optically coupled to one face of said semiconductor laser; and measuring a characteristic of said system.
Claim 2
Independent Claim
82 words
A method of measuring a parameter of a system comprising a semiconductor laser comprising the steps of: periodically cycling the emission wavelength of said semiconductor laser; monitoring the optical power from a first face of said laser; using a feedback control system to maintain said optical power from said first face at a constant level; emitting light from said laser into an optical cavity which is optically coupled to one face of said semiconductor laser; and measuring a characteristic of said system.
Claim 3
Dependent Claim
18 words
A method as recited in claim 1 in which said cycling periodically varies the temperature of said laser.
Claim 4
Dependent Claim
21 words
A method as recited in claim 2 in which said measuring comprises detecting the optical signal intensity from said optical cavity.
Claim 5
Dependent Claim
18 words
A method as recited in claim 1 in which said measuring is of bias current through said laser.
Claim 6
Dependent Claim
24 words
A method as recited in claim 1 in which said measuring step further comprises measuring the distance between intensity maxima thereby determining cavity dimensions.
Claim 7
Dependent Claim
17 words
A method as recited in claim 1 in which said cycling varies bias current through said laser.
References Cited (Backward Citations)
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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) | 1992-01-10 | 1992-07-11 | 1993-01-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-01-10 | 1996-07-11 | 1997-01-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-01-10 | 2000-07-11 | 2001-01-10 | $7700.00 | Window Closed / Lapsed |