Laser diode driving circuit having a temperature compensation ci

Details Laser diode driving circuit having a temperature compensation ci Laser diode driving circuit having a temperature compensation ci

1993-07-22

1995-03-14

Stephan, Steven L.

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Current driver

327513, 327514, H03K 500

Patent

active

053979338

ABSTRACT:
A laser diode driving circuit having a temperature compensation circuit capable of keeping an optical output produced from a laser diode constant relative to the change of temperature. A transistor is connected in series to the laser diode wherein the former controls a forward current to be applied to the latter. A first variable resistor, an FET and a second variable resistor are connected in series to one another and also connected in parallel to the laser diode and the transistor. A node between the first variable resistor and the FET is connected to the base of the transistor. The FET and the second variable resistor constitute a constant current circuit wherein a circuit current, in response to the change of the voltage caused by temperature change applied to the base of the transistor, is set by the second variable resistor to thereby control the output current of the transistor so as to keep the optical output of the laser diode constant.

REFERENCES:
patent: 3192405 (1965-06-01), Patchell
patent: 3300733 (1967-01-01), Price
patent: 3808461 (1974-04-01), Maximov et al.
patent: 4196381 (1980-04-01), Standing

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