Method for deriving precise control over laser power of an...

Details Method for deriving precise control over laser power of an... Method for deriving precise control over laser power of an...

2011-08-02

2011-08-02

Harvey, Minsun (Department: 2828)

Coherent light generators

Particular component circuitry

For driving or controlling laser

C372S038100

Reexamination Certificate

active

07991030

ABSTRACT:
A method for deriving precise control over laser power of an optical pickup unit (OPU) includes: providing an analog-to-digital converter (ADC) within an automatic power calibration (APC) circuit to derive a path gain and/or a path offset from the APC circuit; and selectively performing compensation according to the gain and/or the path offset, in order to maintain precision of a relationship between the laser power and a target command utilized for controlling the laser power. An associated APC circuit comprising an ADC and at least one compensation module is further provided. The ADC is utilized for deriving a path gain and/or a path offset from the APC circuit. The compensation module is utilized for selectively performing compensation according to the path gain and/or the path offset, in order to control the laser power by a target command.

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Chi, “Method for Controlling Laser Power of an Optical Pickup Unit,” pending U.S. Appl. No. 12/198,879, filed Aug. 26, 2008.

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