Control circuit for a laser diode and a method to control a...

Details Control circuit for a laser diode and a method to control a... Control circuit for a laser diode and a method to control a...

2011-03-29

2011-03-29

Harvey, Minsun (Department: 2828)

Coherent light generators

Particular component circuitry

Having fault protection circuitry

C372S038020, C372S038100

Reexamination Certificate

active

07916765

ABSTRACT:
A control circuit for a laser diode is disclosed, in which the driving current may be suppressed even when the monitor PD breaks down to make the APC feedback control inoperable. The control circuit comprises an LD driver to supply the driving current to the LD, a monitor PD to detect a portion of output light from the LD, and the APC controller to adjust the driving current. The current limiter, when the driving current reaches or exceeds the threshold, controls the driving current Id so as to keep the current in a preset value or a value just before the extraordinary increase of the driving current occurs.

REFERENCES:
patent: 5163063 (1992-11-01), Yoshikawa et al.
patent: 6122302 (2000-09-01), Dean
patent: 2006/0164712 (2006-07-01), Ishibashi
patent: 2007/0286610 (2007-12-01), Ishibashi
patent: 2005-123414 (2005-12-01), None

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