Laser diode protective circuit for an optical transmission appar

Details Laser diode protective circuit for an optical transmission appar Laser diode protective circuit for an optical transmission appar

1992-02-13

1993-09-28

Scott, Jr., Leon

Coherent light generators

Particular component circuitry

Optical pumping

372 33, 372 29, H01S 300

Patent

active

052491943

ABSTRACT:
A laser diode protective circuit for an optical transmission apparatus having a laser diode for converting an information signal into a luminous signal to be output. The laser diode protective circuit includes at least two of the following three circuits: a filter circuit, provided at a preceding stage of the laser diode, for permitting passage of only a predetermined frequency band of the information signal; a detection/interruption circuit for detecting when a signal having a level higher than a predetermined level is supplied to the laser diode, and for temporarily interrupting the signal to be supplied to the laser diode; and a control circuit for controlling an electric power for use in driving the laser diode. A noise component to be introduced into the laser diode contained in the optical transmission apparatus is limited by the filter circuit in terms of frequency, the detection/interruption circuit in terms of time, and the control circuit in terms of electric power, so as to protect the laser diode.

REFERENCES:
patent: 4789987 (1988-12-01), Fraser
patent: 4872173 (1989-10-01), Richardson
patent: 4924473 (1990-05-01), Burgyan et al.
patent: 5134624 (1992-07-01), Ono
patent: 5140603 (1992-08-01), Anderson, Jr. et al.

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