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Overloaded phase-code multiplexing for volume holographic storage.

Gernot Berger1, Mathias Dietz, Cornelia Denz

  • 1Institut für Angewandte Physik, Westfälische Wilhelms-Universität Münster, Münster, Germany. gberger@uni-muenster.de

Optics Letters
|June 3, 2008
PubMed
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Overloaded phase codes enhance volume holographic data storage capacity by enabling more data pages than reference beams. This novel approach offers a significant increase in data storage potential.

Area of Science:

  • Optics and Photonics
  • Information Storage
  • Digital Communications

Background:

  • Volume holographic data storage offers high density but faces limitations in multiplexing capacity.
  • Current phase-code designs limit the number of data pages to the number of reference beams.
  • Augmenting data capacity is crucial for practical holographic storage systems.

Purpose of the Study:

  • To introduce overloaded phase codes for volume holographic data storage.
  • To demonstrate a method for exceeding the reference beam limit in data page multiplexing.
  • To investigate the potential for increased data capacity in holographic storage.

Main Methods:

  • Extending multilevel phase codes based on the discrete Fourier transform.
  • Generating overloaded phase codes.

Related Experiment Videos

  • Experimental demonstration of multiplexing analog data pages using overloaded codes.

    • Main Results:

    • Successfully multiplexed 70 analog data pages using 64 reference beams.
    • Overloaded phase codes enable multiplexing beyond the number of reference beams.
    • Analysis indicates a potential capacity gain of up to 15%.

    Conclusions:

    • Overloaded phase codes represent a significant advancement in holographic data storage.
    • This method effectively augments achievable data capacity.
    • The findings suggest a practical pathway to higher density holographic storage solutions.