Semiconductor laser apparatus, information recording/reproducing

Details Semiconductor laser apparatus, information recording/reproducing Semiconductor laser apparatus, information recording/reproducing

1995-06-05

1996-11-26

Bovernick, Rodney B.

Coherent light generators

Particular component circuitry

Optical pumping

H01S 300

Patent

active

055793290

ABSTRACT:
A semiconductor laser apparatus comprises a semiconductor laser, a photodetector, first and second variable gain units, a controllable amplifying unit, a driving unit, and a compensation unit. A control signal is supplied to one of input terminals of each of the first and second variable gain units and an output signal of the photodetector is negative-fed back to the other of the input terminals of each of the first and second variable gain units. A varied gain of an error between the control signal and the output signal is output independently from each of the first and second variable gain units. The controllable amplifying unit amplifies the error signal from the first variable gain unit with desired frequency characteristics. The driving unit supplies a driving current to the semiconductor laser in accordance with a drive control signal from the controllable amplifying unit. The compensation unit negatively feeds back a compensation current to the negative feedback terminals to compensate a phase delay on the basis of the error signal output from the second variable gain unit.

REFERENCES:
patent: 5097473 (1992-03-01), Taguchi
patent: 5250796 (1993-10-01), Taguchi et al.
"Laser Drive IC Realizing Real-Time APC Control, TA8546FN", Takashi Kimura et al., Toshiba Review, 49 (11):790-793 (1994) no month. English Abstract in Japanese.

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