Semiconductor laser drive device with an abnormal voltage protec

Details Semiconductor laser drive device with an abnormal voltage protec Semiconductor laser drive device with an abnormal voltage protec

1986-05-13

1988-05-17

Davie, James W.

Coherent light generators

Particular component circuitry

Optical pumping

372 33, H01S 300

Patent

active

047456108

ABSTRACT:
A plurality of supply voltages are supplied form a power supply to a semiconductor laser drive device. One of these supply voltages is applied to a discrimination circuit. The discrimination circuit includes a first zener diode, to which one of the supply voltages is applied, and which has a zener breakdown voltage corresponding to the lower limit of a threshold voltage range, and a second zener diode, to which the same supply voltage is applied, and which has a zener breakdown voltage corresponding to the upper limit of the threshold voltage range. First and second light-emitting diodes are connected in series with the respective first and second zener diodes. Light emitted from the first and second light-emitting diodes is received by respective first and second phototransistors connected in series between a voltage supply terminal and a ground terminal. A resistor is connected in parallel with the second phototransistor connected to the ground terminal. Voltage at the connection point between the first and second phototransistors is applied to the gate of a junction field-effect transistor, which has its drain grounded and its source connected to a control terminal of a switch in parallel with and for shunting the semiconductor laser.

REFERENCES:
patent: 3898583 (1975-08-01), Shuey
patent: 4238707 (1980-12-01), Malissin et al.

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