Abstract
With increasing optical disk density, land/groove recording has become mainstream and accordinglytrack pitch has continued to become narrower. Therefore, to further increase recording density, it is essential to reduce cross talk and cross erase. In a system optimal recording power is required for recording. However, to determine the optimal recording power, it is necessary to evaluate cross erase characteristics in addition to recording power characteristics, which requires a complicated procedure. We have devised a recording power calibration method using a wobbled track. As a result, it was demonstrated that it is possible to determine the optimal recording power by recording and read-out a monosignal using a wobbled track to calibrate the recording power and observing a sideband wave that accompanies a mono signal. With this method, a considerable amount of work, which was needed to determine the optimal recording power, is no longer necessary. Instead it has become possible to determine optimal recording power with a simple procedure.
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