Semiconductor laser apparatus, information...

Details Semiconductor laser apparatus, information... Semiconductor laser apparatus, information...

2005-05-03

2005-05-03

Leung, Quyen (Department: 2828)

Coherent light generators

Particular component circuitry

Reexamination Certificate

active

06888861

ABSTRACT:
The semiconductor laser apparatus includes a semiconductor laser, a detection element for detecting the intensity of the output light from the semiconductor laser, an error detection circuit containing a gain controllable operation amplifying circuit and a gain-fixed type control amplifying circuit connected to a next stage to the gain controllable operation amplifying circuit, to which a semiconductor laser drive control signal is input and an output signal of the detection element is input as a negative feedback signal, for outputting an error signal corresponding to a difference between the two input signals, a high-frequency signal generating circuit for generating a high-frequency signal having a predetermined frequency, a high-frequency signal superimposing circuit for superimposing the high-frequency signal onto the output signal from the error detection circuit, and a laser drive circuit for supplying a drive current to the semiconductor laser on the basis of the output signal from the high-frequency signal superimposing circuit.

REFERENCES:
patent: 5097473 (1992-03-01), Taguchi
patent: 5579329 (1996-11-01), Taguchi
patent: 5694409 (1997-12-01), Taguchi
patent: 6011768 (2000-01-01), Taguchi

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