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 01:28
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.
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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) | 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 |