Method for correcting output power of online optical head

Abstract

The invention relates to a method for correcting an output power of an online optical head and aims to regulate the laser power of an optical head. A power regulation circuit of the optical head is provided with an optical power regulator and an optical power detector. The optical power regulator is used for regulating the laser power according to a default value. The method comprises the following steps: conducting burning preprocessing; turning up the projected area of the optical head laser on a disc; providing a set value corresponding to a power value to be measured to the optical power regulator according to the power value to be measured; utilizing the optical power regulator to detect laser power emitted by the optical head; comparing the laser power emitted by the optical head with the power value to be measured so as to regulate the set value of the optical power regulator corresponding to the power to be measured; and recovering the projected area of the optical head laser on the disc and conducting optimum power correction when the laser power emitted by the optical head is equal to the power value to be measured.

Description

technical field [0001] The invention relates to a technology of optical storage media, in particular to an on-line output power correction method, which is used to make the best power correction of the optical head accurate and increase the stability of the best power correction. Background technique [0002] In the current burning technology, in order to reduce burning failure and make the burned data more stable, Optimum Power Calibration (OPC) is usually performed before burning. By executing the optimal power calibration program, it is possible to find a set of optimal laser power suitable for burning the optical disc, so that the jitter value (jitter value) or decoding of the radio frequency (RF) data engraved on the optical disc after burning The error rate can be better suppressed, thereby achieving the best burning quality. [0003] Generally, there are two methods for defining the optimal power control program in the specification: β method and γ method. The β meth...

AI Technical Summary

Problems solved by technology

[0007] However, as the diode 103 of the laser head is aging or the power supply from the computer to the recorder is unstable, the input value DG2 found in the look-up table of the output power P2 will be inaccurate

For example, the original desired output power is 5mW, because the laser head diode 103 is aging or the power supply is unstable, the input value DG2 set by the factory can only make the laser head diode 103 output 4.3mW, this situation will lead to the worst Optimum Power Calibration (OPC) misalignment, resulting in poor programming quality or even programming failure

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