Gray-scale data pages for digital holographic data storage

Geoffrey W. Burr, Gabriele Barking, Hans Coufal, John A. Hoffnagle, C. Michael Jefferson, Mark A Neifeld

Research output: Contribution to journalArticle

29 Citations (Scopus)

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 5 bits/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.

Original languageEnglish (US)
Pages (from-to)1218-1220
Number of pages3
JournalOptics Letters
Volume23
Issue number15
StatePublished - Aug 1 1998

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gray scale
data storage
signal to noise ratios
binary data
modulation
decoding
readout
recording
pixels
geometry

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

Cite this

Burr, G. W., Barking, G., Coufal, H., Hoffnagle, J. A., Jefferson, C. M., & Neifeld, M. A. (1998). Gray-scale data pages for digital holographic data storage. Optics Letters, 23(15), 1218-1220.

Gray-scale data pages for digital holographic data storage. / Burr, Geoffrey W.; Barking, Gabriele; Coufal, Hans; Hoffnagle, John A.; Jefferson, C. Michael; Neifeld, Mark A.

In: Optics Letters, Vol. 23, No. 15, 01.08.1998, p. 1218-1220.

Research output: Contribution to journalArticle

Burr, GW, Barking, G, Coufal, H, Hoffnagle, JA, Jefferson, CM & Neifeld, MA 1998, 'Gray-scale data pages for digital holographic data storage', Optics Letters, vol. 23, no. 15, pp. 1218-1220.
Burr GW, Barking G, Coufal H, Hoffnagle JA, Jefferson CM, Neifeld MA. Gray-scale data pages for digital holographic data storage. Optics Letters. 1998 Aug 1;23(15):1218-1220.
Burr, Geoffrey W. ; Barking, Gabriele ; Coufal, Hans ; Hoffnagle, John A. ; Jefferson, C. Michael ; Neifeld, Mark A. / Gray-scale data pages for digital holographic data storage. In: Optics Letters. 1998 ; Vol. 23, No. 15. pp. 1218-1220.
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