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Optics Letters

Optics Letters

| RAPID, SHORT PUBLICATIONS ON THE LATEST IN OPTICAL DISCOVERIES

  • Vol. 23, Iss. 15 — Aug. 1, 1998
  • pp: 1218–1220

Gray-scale data pages for digital holographic data storage

Geoffrey W. Burr, Gabriele Barking, Hans Coufal, John A. Hoffnagle, C. Michael Jefferson, and Mark A. Neifeld  »View Author Affiliations


Optics Letters, Vol. 23, Issue 15, pp. 1218-1220 (1998)
http://dx.doi.org/10.1364/OL.23.001218


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Abstract

The prospects for gray-scale (or multilevel) digital holographic data storage are theoretically and experimentally investigated. A simple signal-to-noise ratio (SNR) partitioning argument shows that when SNR scales as 1 over the number of holograms squared, five gray levels (log2 5bits/pixel) would be expected to result in a 15% capacity increase over binary data pages. However, the additional signal-dependent noise sources present in practical systems create a baseline SNR that reduces both the optimal number of gray levels and the resulting gain in capacity. To implement gray-scale recording experimentally, we adapt the predistortion technique previously developed for binary page-oriented memories [Opt. Lett. 23, 289 (1998)]. Several new block-based modulation codes for decoding gray-scale data pages are introduced. User capacity is evaluated by an experimental technique using LiNbO3 :Fe in the 90° geometry. Experimental results show that a balanced modulation code with three gray levels provides a 30% increase in capacity (as well as a 30% increase in readout rate) over local binary thresholding.

© 1998 Optical Society of America

OCIS Codes
(210.0210) Optical data storage : Optical data storage
(210.2860) Optical data storage : Holographic and volume memories

Citation
Geoffrey W. Burr, Gabriele Barking, Hans Coufal, John A. Hoffnagle, C. Michael Jefferson, and Mark A. Neifeld, "Gray-scale data pages for digital holographic data storage," Opt. Lett. 23, 1218-1220 (1998)
http://www.opticsinfobase.org/ol/abstract.cfm?URI=ol-23-15-1218

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