Using pit-depth modulation to increase capacity and data transfer rate in optical discs

Stephan Spielman; Bruce V. Johnson; Greg A. McDermott; Michael P. O'Neill; C. Pietrzyk; Tariq Shafaat; David K. Warland; Terrence L. Wong

doi:10.1117/12.280677

30 July 1997 Using pit-depth modulation to increase capacity and data transfer rate in optical discs

Stephan Spielman, Bruce V. Johnson, Greg A. McDermott, Michael P. O'Neill, C. Pietrzyk, Tariq Shafaat, David K. Warland, Terrence L. Wong

Author Affiliations +

Proceedings Volume 3109, Optical Data Storage 1997 Topical Meeting; (1997) https://doi.org/10.1117/12.280677
Event: Optical Data Storage Topical Meeting '97, 1997, Tucson, AZ, United States

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.

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Stephan Spielman, Bruce V. Johnson, Greg A. McDermott, Michael P. O'Neill, C. Pietrzyk, Tariq Shafaat, David K. Warland, and Terrence L. Wong "Using pit-depth modulation to increase capacity and data transfer rate in optical discs", Proc. SPIE 3109, Optical Data Storage 1997 Topical Meeting, (30 July 1997); https://doi.org/10.1117/12.280677

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