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Proceedings Article

Coding tradeoffs for high-density holographic data storage

[+] Author Affiliations
Geoffrey W. Burr, Brian Marcus

IBM Almaden Research Ctr. (USA)

Proc. SPIE 3802, Advanced Optical Data Storage: Materials, Systems, and Interfaces to Computers, 18 (November 22, 1999); doi:10.1117/12.370244
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From Conference Volume 3802

  • Advanced Optical Data Storage: Materials, Systems, and Interfaces to Computers
  • Pericles A. Mitkas; Zameer U. Hasan; Hans J. Coufal; Glenn T. Sincerbox
  • Denver, CO, USA | July 18, 1999

abstract

We present an initial experimental evaluation of coding and signal processing tradeoffs in high-density holographic data storage. Block-based and low-pass modulation codes, predistortion of holographic pages during recording (pre- processing), and conventional equalization (post-processing) are compared using a few recorded holograms. The relative gain in number of stored holograms is obtained by measuring BER as a function of readout power: the effect on density is gauged by the size of the Fourier plane aperture in the holographic system. Results show that equalization provides a 20% density gain, and predistortion a 60% gain. The total improvement in density by combining small apertures with both of these signal processing options is greater than 100% with an 8:12 strong balanced block code, a 6:9 lowpass/sparse code, and a parity thresholding technique with 9.1% overhead.

© (1999) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.
Citation

Geoffrey W. Burr and Brian Marcus
"Coding tradeoffs for high-density holographic data storage", Proc. SPIE 3802, Advanced Optical Data Storage: Materials, Systems, and Interfaces to Computers, 18 (November 22, 1999); doi:10.1117/12.370244; http://dx.doi.org/10.1117/12.370244


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