Abstract
We previously reported a novel optical pick-up using a confocal laser coupler (CLC) and the confocal push-pull (CPP) method of detecting tracking-error signals. The CPP method is very stable in the face of the lens displacement of the optical pick-up, but it remains to determine whether the optical pick-up can be applied to optical disk systems of various parameters. In this paper, the inherent characteristics of the CPP method of detecting tracking-error signals are discussed based on the results of numerical analysis and experiments.
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