US4813045A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Laser driver
Assignee: Tektronix Inc
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Filing: 1986-07-28
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Granted: 1989-03-14
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Expires: 2006-07-28
Abstract
Abstract A laser driver which compensates for package parasitics at high frequencies has a current source to drive a laser diode. A modulation signal is input to an impedance matched buffer amplifier. A common-emitter amplifier is connected to the output of the buffer amplifier and operates as the current source.
Inventors
- 👤 Charles F. Culpepper
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-10 02:20
CPC Classifications
H; H01; H01S; H01S5/00; H01S5/04; H01S5/042
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
56 words
A laser driver for a laser diode comprising: an impedance matched input buffer amplifier to which a modulation signal is applied; and a current source coupled to the output of the impedance matched input buffer amplifier, the output of the current source providing an essentially constant amplitude a.c. current component coupled to drive the laser diode.
Claim 2
Dependent Claim
56 words
A laser driver for a laser diode comprising: an impedance matched input buffer amplifier to which a modulation signal is applied; and a current source coupled to the output of the impedance matched input buffer amplifier, the output of the current source providing an essentially constant amplitude a.c. current component coupled to drive the laser diode.
Claim 3
Dependent Claim
47 words
A laser driver as recited in claim 1 wherein the impedance matched input buffer amplifier comprises: an input impedance matching circuit to which the modulation signal is applied; and a common-base amplifier with the emitter coupled to the input impedance matching circuit to receive the modulation signal.
Claim 4
Dependent Claim
44 words
A laser driver as recited in claim 2 wherein the current source comprises a common-emitter amplifier coupled to the collector of the common-base amplifier, the common-emitter amplifier having its collector coupled to the laser diode to provide the essentially constant amplitude a.c. drive current.
References Cited (Backward Citations)
US3648073A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-03-13 | 1992-09-12 | 1993-03-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-03-13 | 1996-09-12 | 1997-03-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-03-13 | 2000-09-12 | 2001-03-14 | $7700.00 | Window Closed / Lapsed |