Driver circuit for a solid state optical emitter device

Details Driver circuit for a solid state optical emitter device Driver circuit for a solid state optical emitter device

1998-10-23

2000-02-22

Scott, Jr., Leon

Coherent light generators

Particular component circuitry

Optical pumping

H01S 300

Patent

active

06028871&

ABSTRACT:
The present invention relates to a circuit for driving a solid state optical emitter device such as a laser diode, and in particular a circuit which limits the maximum current which may be drawn through the device. The circuit comprises a current supply path and a current return path to which the optical emitter may be connected, and a current limit device to limit a maximum current that may flow through one of the current paths. The current limit device has a current mirror with an input portion and an output portion, the circuit being arranged so that when a first current flows through the input portion, the second portion is predisposed to supply a second current up to a maximum which mirrors the first current. The maximum current through the paths is thereby limited in accordance with the maximum of the second current.

REFERENCES:
patent: 5315606 (1994-05-01), Tanaka
patent: 5675599 (1997-10-01), Abe et al.
patent: 5736844 (1998-04-01), Yanagisawa
Patent Abstracts of Japan, vol. 012, No. 063, Feb. 25, 1988, Nagano Katsumi, "Bias Current source for Semiconductor Laser".
Patent Abstracts of Japan, vol. 095, No. 004, May 31, 1995, Kitayama Tadayoshi, "Semiconductor-Laser-Element Driving Circuit".
Patent Abstracts of Japan, vol. 013, No. 248, Jun. 1989, Wada Akira, "Semiconductor Laser Device Driving Circuit".
Patent Abstracts of Japan, vol. 013, No. 354, Aug. 8, 1989, Wada Akira, "Semiconductor Laser Driving Circuit".

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