Semiconductor laser driver circuit

Details Semiconductor laser driver circuit Semiconductor laser driver circuit

1985-06-17

1987-11-24

Davie, James W.

Coherent light generators

Particular component circuitry

Optical pumping

372 26, 372 29, H01S 300

Patent

active

047093706

ABSTRACT:
A driver for driving the anode of a laser diode includes a constant-current differential switch comprising NPN transistors. Two sources supply constant current into the node where the differential switch drives the laser diode: one source supplies bias current through the laser diode; the second provides a current substantially equal to the constant current through the differential switch. When the transistor, which drives the laser diode, is turned on by a modulating signal applied to its base electrode, the current from the second source flows through it into the current source at the common emitter junction. When this transistor is turned off, the current from the second source flows through the laser diode, adding to the bias current therethrough. Under these circumstances, the total current through the laser diode exceeds the threshold for lasing action and the laser diode is turned on.

REFERENCES:
patent: 4009385 (1977-02-01), Sell
patent: 4366567 (1982-12-01), Fukuzawa et al.
patent: 4449212 (1984-05-01), Reno
patent: 4674093 (1987-06-01), Angerstein et al.

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