Abstract

A noise power-spectrum estimation method for mark-profile fluctuation is presented for optical-disk readout signals. The diffraction by marks is modeled by use of the Fraunhofer diffraction theory, and mark-profile fluctuations are taken into account through statistical averaging. The change in the readout signal is assumed to be linear to the change in the mark profile. The calculated results for a high-definition video disk agree well with the experimental results. Fluctuations in the mark-edge position is the major source of noise in the present high-definition video-disk system.

© 1994 Optical Society of America

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