Patent US5844928A successfully refreshed from Google Patents.
US5844928A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Laser driver with temperature sensor on an integrated circuit
Assignee: Agere Systems LLC
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Filing: 1997-02-20
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Granted: 1998-12-01
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Expires: 2017-02-20
Abstract
Abstract There is disclosed a laser driver or transmitter in which a drive current is generated by monitoring the temperature of an integrated circuit that generates drive current for the laser. The temperature sensed at the integrated circuit is transformed to a corresponding temperature at the laser. A drive current is generated for the laser that is dependent on the corresponding temperature at the laser.
Inventors
- 👤 Kalpendu Ranjitrai Shastri
- 👤 David Alan Snyder
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 19:55
CPC Classifications
H; H01; H01S; H01S5/00; H01S5/06; H01S5/068; H01S5/06804; G; G11; G11B; G11B20/00; G11B20/10; G11B20/10009; G11B20/10222; H04; H04B; H04B10/00; H04B10/40; H01S5/0617; H01S5/0683; H01S5/0687
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
71 words
A method of generating a drive current for a laser, comprising the steps of: monitoring the temperature of an integrated circuit that generates drive current for a laser, the integrated circuit remotely located with respect to said laser; converting the temperature of the integrated circuit to a corresponding temperature at the laser; and generating a drive current for the laser that is a function of the corresponding temperature at the laser.
Claim 2
Independent Claim
71 words
A method of generating a drive current for a laser, comprising the steps of: monitoring the temperature of an integrated circuit that generates drive current for a laser, the integrated circuit remotely located with respect to said laser; converting the temperature of the integrated circuit to a corresponding temperature at the laser; and generating a drive current for the laser that is a function of the corresponding temperature at the laser.
Claim 3
Dependent Claim
32 words
The method as recited in claim 1, wherein the converting step comprises entering a look-up table with a representation of the integrated circuit temperature to obtain the corresponding temperature at the laser.
Claim 4
Dependent Claim
42 words
The method as recited in claim 1, wherein the generating step comprises: predetermining a plurality of discrete drive currents over a range of corresponding laser temperatures; and storing a digital representation of the plurality of discrete drive currents in a look-up table.
Claim 5
Dependent Claim
50 words
The method as recited in claim 3, further comprising the steps of: entering the look-up table based on a temperature of the integrated circuit; and retrieving from the look-up table a digital representation of one of the plurality of drive currents that correlates to the temperature of the integrated circuit.
Claim 6
Dependent Claim
119 words
A laser transmitter, comprising a laser for receiving a drive current and for emitting light in response thereto; an integrated circuit for generating the drive current for the laser and remotely located with respect to said laser, the integrated circuit comprising a temperature sensing circuit that senses the temperature of the integrated circuit, the integrated circuit converting the temperature at the integrated circuit to a representation corresponding to the temperature at the laser; a look-up table for receiving the representation corresponding to the temperature at the laser and for generating a representation of a corresponding drive current; and a driver for converting the representation of the drive current into a drive current, the drive current provided to the laser.
Claim 7
Dependent Claim
119 words
A laser transmitter, comprising a laser for receiving a drive current and for emitting light in response thereto; an integrated circuit for generating the drive current for the laser and remotely located with respect to said laser, the integrated circuit comprising a temperature sensing circuit that senses the temperature of the integrated circuit, the integrated circuit converting the temperature at the integrated circuit to a representation corresponding to the temperature at the laser; a look-up table for receiving the representation corresponding to the temperature at the laser and for generating a representation of a corresponding drive current; and a driver for converting the representation of the drive current into a drive current, the drive current provided to the laser.
Claim 8
Dependent Claim
22 words
The laser transmitter as recited in claim 5, wherein the look-up table is stored in an electrically erasable programmable read only memory.
Claim 9
Dependent Claim
20 words
The laser transmitter as recited in claim 5, wherein the representation of the corresponding drive current is a digital representation.
Claim 10
Dependent Claim
15 words
The laser transmitter as recited in claim 7, wherein the driver is a digital-to-analog converter.
References Cited (Backward Citations)
JPS60251731A
Cited
US4710631A
Cited
JPH0220084A
Cited
EP0421674A2
Cited
US5043992A
Cited
EP0431832A2
Cited
US5019769A
Cited
US5334826A
Cited
US5337254A
Cited
US5278404A
Cited
US5396059A
Cited
US5625616A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2001-11-30 | 2002-06-01 | 2002-12-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2005-11-30 | 2006-06-01 | 2006-12-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2009-11-30 | 2010-06-01 | 2010-12-01 | $7700.00 | Window Closed / Lapsed |