Comparison of multilevel runlength and fixed-length modulation for optical data storage

Estuardo Licona; Steven W. McLaughlin

doi:10.1117/12.533133

16 September 2003 Comparison of multilevel runlength and fixed-length modulation for optical data storage

Estuardo Licona, Steven W. McLaughlin

Proceedings Volume 5069, Optical Data Storage 2003; (2003) https://doi.org/10.1117/12.533133
Event: Optical Data Storage 2003, 2003, Vancouver, Canada

Abstract

In this paper we consider theoretical and practical aspects of a multilevel, re-writable and write-once optical recording system with compact disc parameters. A linear time invariant channel model is presented. We compare fixed-length and variable length runlength limited (RLL) coding and find that for the mark lengths of interest (600 nm for CD) M=4 is the optimum number of levels for RLL coding. For fixed-length modulation M=8 is the optimum number of levels and it is superior to RLL overall. We also show that M-ary RLL is a practical alternative if stronger coding can be applied to it.

Citation Download Citation

Estuardo Licona and Steven W. McLaughlin "Comparison of multilevel runlength and fixed-length modulation for optical data storage", Proc. SPIE 5069, Optical Data Storage 2003, (16 September 2003); https://doi.org/10.1117/12.533133

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