Coherent light generators – Particular beam control device – Optical output stabilization
Reexamination Certificate
2007-06-08
2008-11-25
Rodriguez, Armando (Department: 2828)
Coherent light generators
Particular beam control device
Optical output stabilization
C372S029014, C372S038020
Reexamination Certificate
active
07457332
ABSTRACT:
A laser power control unit used for controlling the laser power of an optical pick-up unit (OPU) is provided. The laser power control unit includes: at least one analog-to-digital converter (ADC) electrically coupled to the OPU for transferring a front photodiode output signal into a digital feedback signal; and at least one digital control circuit electrically coupled to the ADC for generating a power control signal and outputting the power control signal to the OPU in order to control the laser power of the OPU. The digital control circuit has a compensation circuit used for generating a compensation value according to a difference between the digital feedback signal and a digital target feedback signal so as to adjust the power control signal. The front photodiode output signal corresponds to the laser power of the OPU.
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Hsu Ching-Chuan
Li Yung-Chih
Liao Hsueh-Kun
Hsu Winston
Mediatek Inc.
Rodriguez Armando
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