Optical disc recorder laser power control

Details Optical disc recorder laser power control Optical disc recorder laser power control

2005-03-25

2009-12-22

Harvey, Minsun (Department: 2828)

Coherent light generators

Particular component circuitry

Controlling current or voltage to laser

C372S038100, C372S038020, C372S038010

Reexamination Certificate

active

07636377

ABSTRACT:
The present invention is directed to an optical disc recorder laser power control apparatus utilizing two different current sources to solve the problem caused by the contradiction between control resolution and control range. The first current source and the second current source are connected in parallel to a single control output pin. The first current source and the second current source may work independently from each other. The laser driver controls emission power of one of the laser diodes with a driving current supplied from the single control output pin coupled to both the first current source and the second current source. Advantageously, the fine laser power control pitch from the first current source contributes to fine control resolution, while the coarse laser power control from the second current source provides a wide control range for various kinds of laser diodes.

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Applying the AN10E40 Control of Thermo-Electric Coolers in Laser Diode Systems; Anadigm; App Note 011, AP020800-U011; www.anadigm.com.

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