Optical disc recorder laser power control

An optical disc laser power control apparatus, comprising:

• a plurality of laser diodes for emitting laser beams, the laser beams being emitted for reproducing or recording data from/to an optical disc;
• a first current source;
• a second current source coupled to the first current source, the second current source and the first current source coupled in parallel to a single output;
• a laser diode driver for controlling emission power of the plurality of laser diode with a driving current supplied from the single output of the first current source and the second current source;
• a photodetector for detecting at least part of laser beams emitted from one of plurality of the laser diodes to convert the emitted laser power into an electrical signal;
• and
• an automatic power control circuit coupled to the first current source, the automatic power control circuit for controlling the first current source,
• wherein the first current source is a fine current source.

A method for an optical disc laser power control circuit, comprising:

• providing a first current source and a second current source, the first current source and the second current source being coupled in parallel to a single control output pin;
• based on a driving current from the single control output pin, emitting laser beams for reproducing or recording data from/to an optical disc;
• detecting at least part of the laser beams emitted;
• converting the emitted laser power into a photodetector output signal;
• outputting a laser power strength signal based on the photodetector output signal;
• controlling a laser power strength dynamically via a closed mixed-signal loop;
• adjusting the laser power strength to a target preset level continuously;
• and
• wherein the first current source is operable independently from the second current source and the second current source is operable independently from the first current source.