Laser power contol method of optical recording system and its device

Abstract

The optical recording system possesses an optical resource, which provides optical incident write signal capable of recording data on optical recording media. The method includes an optical detection circuit, which detects and gets reflected write signal of the optical incident write signal. Based on the reflected write signal, a tag format type signal generation circuit generates signal to show optical recording effectiveness. Laser power compensation circuit with a filter separates first and second components from the effectiveness signal. Output power of the optical resource is controlled by the first and second components

Description

technical field [0001] The present invention relates to a laser power control method and its device, in particular to a laser power control method and its device for an optical recording system capable of providing the best recording quality on an optical recording medium. Background technique [0002] In optical data recording, a light source, usually a laser beam emitted by a laser read / write head, generates a write signal that is used to record data on an optical recording medium. Therefore, in order to ensure that the data is recorded correctly, the laser output It is important to maintain an appropriate power level. Generally, an optimal power control (OPC) technique is usually used to determine an initial laser writing power. The method is to first allocate a section on an optical recordable medium, such as a recordable optical disc, as a power calibration test. Use, and use a series of laser powers on this section to make some practice records, and then read out the ...

AI Technical Summary

Problems solved by technology

However, in most optical recording systems, the optimal write signal power does not remain fixed, but is affected by system and optical disc fluctuation factors and needs to be corrected. These fluctuation factors that reduce recording quality include: The thickness change of the recording dyed layer of the optical recording medium and the birefringence of the substrate, the change of the recording point due to the length offset of the laser, the temperature and the disc tilt rate, defocus, derailment and positioning, etc.

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