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Proceedings Paper

Using pit-depth modulation to increase capacity and data transfer rate in optical discs
Author(s): Stephan Spielman; Bruce V. Johnson; Greg A. McDermott; Michael P. O'Neill; C. Pietrzyk; Tariq Shafaat; David K. Warland; Terrence L. Wong
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Paper Abstract

The technique of pit-depth modulation is applied to optical data storage. Pits of M possible depths are written end-to- end to form a groove encoding log2(M) bits in each mark. Data was encoded onto discs with CD dimensions using standard photoresist mastering and replication methods. Methods for removing inter-symbol interference are demonstrated on pits as short as 0.6 micrometers . A 6-level pattern of 0.6 micrometers pits was read by an optical head from a 6X CD-ROM drive and the original levels were recovered with a standard deviation of approximately 6% of the dynamic range. A system prototype read data encoded as 4-level 0.8 micrometers pits with a raw bit error rate of 3 X 10-4.

Paper Details

Date Published: 30 July 1997
PDF: 7 pages
Proc. SPIE 3109, Optical Data Storage 1997 Topical Meeting, (30 July 1997); doi: 10.1117/12.280677
Show Author Affiliations
Stephan Spielman, Calimetrics, Inc. (United States)
Bruce V. Johnson, Calimetrics, Inc. (United States)
Greg A. McDermott, Calimetrics, Inc. (United States)
Michael P. O'Neill, Calimetrics, Inc. (United States)
C. Pietrzyk, Calimetrics, Inc. (United States)
Tariq Shafaat, Calimetrics, Inc. (United States)
David K. Warland, Calimetrics, Inc. (United States)
Terrence L. Wong, Calimetrics, Inc. (United States)


Published in SPIE Proceedings Vol. 3109:
Optical Data Storage 1997 Topical Meeting
Henryk Birecki; James Z. Kwiecien, Editor(s)

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