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US 5,844,928 AGranted
Laser driver with temperature sensor on an integrated circuit
AssigneeLucent Technologies Inc.
InventorsKalpendu Ranjitrai Shastri, David Alan Snyder
Life of this patent
Estimating the term…
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.
Claims8
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.
1 more element
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.
2 more elements
Dependencies are inferred from the claim text.