Abstract

Kodak's 14" optical disk drive uses Run-Length-Limited (RLL) encoding techniques to increase the in-track packing density. In a pulse length encoding scheme using RLL codes, the clock and data are encoded in the mark edges and not in the mark itself. The use of such encoding schemes allows an increase in the in-track density over pulse position encoding techniques. The price of using this technique is that the CNR and linearity of the media must be consistent and of high quality.

© 1987 Optical Society of America