Patent ID: 8270270

Claim:
An on-line output power calibrating method for adjusting laser power of an optical pick-up, wherein the optical pick-up comprises an optical power regulator and an optical power detector, the on-line output power calibrating method comprising the steps of: performing a recording pre-process; providing a focus offset value and/or a tilt offset value to the optical pick-up; performing a close loop output power calibration; performing an open loop output power calibration, comprising: providing a setting value corresponding to power under test to the optical power regulator according to the power under test, wherein the setting value is read from a look-up table according to the power under test; using the optical power detector to detect the laser power emitted from the optical pick-up; comparing the laser power with the power under test to adjust the setting value of the optical power regulator corresponding to the power under test; determining whether the laser power emitted from the optical pick-up conforms to the power under test; and updating the setting value in the look-up table when the laser power emitted from the optical pick-up conforms to the power under test; and performing an optimum power calibration according to the updated setting value; wherein all of the above-mentioned steps of the on-line output power calibrating method are performed on-line when a recorder is configured by a user to perform a recording process, and wherein the close loop output power calibration is different from the open loop output power calibration.