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Proceedings Paper

Digital data storage in a phase-encoded holographic memory system: data quality and security
Author(s): Gernot Berger; Kai-Oliver Mueller; Cornelia Denz; Istvan Foldvari; Agnes Peter
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Paper Abstract

We review the crucial properties of a phase-encoded volume holographic storage system in terms of data quality and security, which are the key issues of any bulk memory system. Two major problems which need to be tackled in holographic storage systems in terms of data quality are the hologram erasure during readout and the data encoding schemes for error-free reconstruction. We present a novel storage material, (bismuth tellurite crystals - Bi2TeO5), which has the potential to overcome the volatility problem and avoiding the need of any further fixing. Regarding data encoding schemes, we present a general approach of gray scale modulation coding in order to improve the data capacity in comparison to normal modulation coding, while the bit error rate maintains low. Data security in a phase encoded system can be realized by exploiting its special multiplexing characteristics. We present different encryption techniques and investigate their decryption probability.

Paper Details

Date Published: 1 July 2003
PDF: 8 pages
Proc. SPIE 4988, Advanced Optical Data Storage, (1 July 2003); doi: 10.1117/12.501107
Show Author Affiliations
Gernot Berger, Univ. Muenster (Germany)
Kai-Oliver Mueller, Univ. Muenster (Germany)
Cornelia Denz, Univ. Muenster (Germany)
Istvan Foldvari, Research Institute for Solid State Physics and Optics (Hungary)
Agnes Peter, Research Institute for Solid State Physics and Optics (Hungary)

Published in SPIE Proceedings Vol. 4988:
Advanced Optical Data Storage
Hans J. Coufal; Alan E. Craig; Zameer U. Hasan, Editor(s)

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