Simplified combination laser diode protective circuit

Details Simplified combination laser diode protective circuit Simplified combination laser diode protective circuit

1991-09-26

1993-06-08

Scott, Jr., Leon

Coherent light generators

Particular component circuitry

Optical pumping

H01S 300

Patent

active

052186121

ABSTRACT:
To protect a laser diode (LD) against both excessive input signal levels and electrostatic charges, a high-frequency limiting circuit (BE) and a high-frequency damping circuit (AT) are interconnected, and additionally coupled to a source of bias voltage (U.sub.DC). The high-frequency limiting circuit has two Schottky diodes (D1, D2), biassed for non-conduction, and the damping circuit a PIN diode (D3) likewise biassed for high-resistance value. Upon exceeding a threshold as set by the bias voltage, diodes (D1, D2) become conductive and symmetrically limit the signal, and diode (D3) additionally dampens the signal; an electrostatic charge to the input control the diodes into conductive state and limits the value of energy transferred to the laser diode (LD) to a safe value.

REFERENCES:
patent: 3806829 (1974-04-01), Duston et al.
patent: 4237427 (1980-12-01), Holland
patent: 4924473 (1990-05-01), Burgyan et al.
patent: 4982407 (1991-01-01), Murase

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