US4785454A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Stabilized cleaved-coupled cavity laser
Assignee: Nokia Bell Labs
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Filing: 1983-05-13
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Granted: 1988-11-15
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Expires: 2003-05-13
Abstract
Abstract A light transmitter comprising a cleaved-coupled cavity laser and stabilization means to maintain the laser in single longitudinal mode operation is described. '
Inventors
- 👤 Nils A. Olsson
- 👤 Won-Tien Tsang
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 09:35
CPC Classifications
H; H01; H01S; H01S5/00; H01S5/10; H01S5/14; H01S3/00; H01S3/05; H01S3/08; H01S3/081; H01S3/082; H01S3/0823; H01S3/0826; H01S5/1021; H01S5/02; H01S5/026; H01S5/40; H01S5/4025
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
59 words
A light transmitter comprising a cleaved-coupled cavity laser comprising a laser section and a modulator section, means for measuring at least one characteristic of the light output from one of said sections with respect to the current through the modulator section; and feedback means using said at least one characteristic to maintain said output at a desired spectral value.
Claim 2
Dependent Claim
59 words
A light transmitter comprising a cleaved-coupled cavity laser comprising a laser section and a modulator section, means for measuring at least one characteristic of the light output from one of said sections with respect to the current through the modulator section; and feedback means using said at least one characteristic to maintain said output at a desired spectral value.
Claim 3
Dependent Claim
19 words
A light transmitter as recited in claim 1 in which said one of said sections comprises said modulator section.
Claim 4
Dependent Claim
33 words
A light transmitter as recited in claim 2 in which said at least one characteristic comprises the first derivative of the light output intensity with respect to the current through the modulator section.
Claim 5
Dependent Claim
23 words
A light transmitter as recited in claim 3 in which said feedback means maintains said first derivative at a value of approximately zero.
Claim 6
Dependent Claim
33 words
A light transmitter as recited in claim 4 in which said feedback means maintains said value of approximately zero at a local maximum in the light output power versus modulator current characteristic curve.
Claim 7
Dependent Claim
20 words
A light transmitter as recited in claim 5 further comprising means for superimposing a modulator current through said modulator section.
Claim 8
Dependent Claim
29 words
An optical communications system comprising a light transmitter as recited in claim 6, a photodetector, and an optical fiber, said fiber optically coupling said light transmitter and said photodetector.
Claim 9
Dependent Claim
29 words
An optical communications system comprising a light transmitter as recited in claim 5, a photodetector, and an optical fiber, said fiber optically coupling said light transmitter and said photodetector.
Claim 10
Dependent Claim
29 words
An optical communications system comprising a light transmitter as recited in claim 4, a photodetector, and an optical fiber, said fiber optically coupling said light transmitter and said photodetector.
Claim 11
Dependent Claim
29 words
An optical communications system comprising a light transmitter as recited in claim 3, a photodetector, and an optical fiber, said fiber optically coupling said light transmitter and said photodetector.
Claim 12
Dependent Claim
20 words
A light transmitter as recited in claim 2 in which said at least one characteristic comprises the light output intensity.
Claim 13
Dependent Claim
29 words
An optical communications system comprising a light transmitter as recited in claim 11, a photodetector, and an optical fiber, said fiber optically coupling said light transmitter and said photodetector.
Claim 14
Dependent Claim
30 words
A light transmitter as recited in claim 11, in which said feedback means maintains said characteristic at a local maximum in the light output power versus modulator current characteristic curve.
Claim 15
Dependent Claim
20 words
A light transmitter as recited in claim 13 further comprising means for superimposing a modulating current through said modulator section.
Claim 16
Dependent Claim
29 words
An optical communications system comprising a light transmitter as recited in claim 14, a photodetector, and an optical fiber, said fiber optically coupling said light transmitter and said photodetector.
Claim 17
Dependent Claim
29 words
An optical communications system comprising a light transmitter as recited in claim 13, a photodetector, and an optical fiber, said fiber optically coupling said light transmitter and said photodetector.
Claim 18
Dependent Claim
29 words
An optical communications system comprising a light transmitter as recited in claim 2, a photodetector, and an optical fiber, said fiber optically coupling said light transmitter and said photodetector.
Claim 19
Dependent Claim
29 words
An optical communications system comprising a light transmitter as recited in claim 1, a photodetector, and an optical fiber, said fiber optically coupling said light transmitter and said photodetector.
References Cited (Backward Citations)
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) | 1991-11-15 | 1992-05-16 | 1992-11-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-11-15 | 1996-05-16 | 1996-11-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-11-15 | 2000-05-16 | 2000-11-15 | $7700.00 | Window Closed / Lapsed |