Digital data storage in a phase-encoded holographic memory system: Data quality and security

G. Berger, K. O. Müller, C. Denz, I. Földvári, Á Péter

Research output: Contribution to journalConference article

8 Citations (Scopus)


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 - Bi 2TeO5) 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.

Original languageEnglish
Pages (from-to)104-111
Number of pages8
JournalProceedings of SPIE - The International Society for Optical Engineering
Publication statusPublished - Nov 27 2003
EventPROCEEDINGS OF SPIE SPIE - The International Society for Optical Engineering: Advanced Optical Data Storage - San Jose, CA, United States
Duration: Jan 28 2003Jan 29 2003


  • Data encryption
  • Modulation coding
  • Non-volatile holographic storage
  • Phase-code multiplexing
  • Random phase encoding
  • Volume holography

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering

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