Laser driving apparatus with current control circuitry and multi-channel circuitry

A laser driving apparatus, comprising:

• a driver, comprising:
• a laser driving circuit, configured to generate a driving current to drive a laser;
• a tracking circuit, comprising:
• a reference current source, configured to generate a reference current as a reference for the laser driving apparatus;
• and
• a replica circuit, corresponding to at least a portion of the laser driving circuit, configured to generate a sensing current according to the reference current;
• a comparator, electrically coupled to the laser driving circuit and the replica circuit, configured to compare a first voltage on the laser driving circuit and a second voltage on the replica circuit to generate a comparison signal;
• and
• a control circuit comprising a digital circuit, the control circuit configured to adjust the sensing current in a first operating mode and the driving current in a second operating mode, the control circuit configured to receive the comparison signal and generate a digital code to adjust the sensing current or the driving current according to the comparison signal.