Methods and apparatus for driving a laser diode

Details Methods and apparatus for driving a laser diode Methods and apparatus for driving a laser diode

1996-07-30

1999-08-10

Bovernick, Rodney

Coherent light generators

Particular component circuitry

Optical pumping

372 31, H01S 300

Patent

active

059369868

ABSTRACT:
A circuit and method for driving a laser diode with high stability. A steady state current is generated and used to drive the laser diode. A dynamic feedback signal is generated and used to operate the laser diode in a constant power mode. An operational amplifier having a transistor and an RC circuit in the feedback loop is used to couple the drive voltage source to the laser diode. A potentiometer in the inverting amplifier input is used to control the laser diode output current amplitude. A longevity signal is provided to indicate whether or not the laser diode current is excessive.

REFERENCES:
patent: 4806873 (1989-02-01), Nagano
patent: 4819241 (1989-04-01), Nagano
patent: 4977564 (1990-12-01), Ryu et al.
patent: 5050177 (1991-09-01), Ema
patent: 5349595 (1994-09-01), Ogawa et al.
patent: 5638390 (1997-06-01), Gilliland et al.
patent: 5646560 (1997-07-01), Nguyen

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