Abstract

Two novel techniques for eliminating deterministic noise from a page-oriented memory are presented. The first technique equalizes the output response of ON pixels by adjustment of the exposure of each pixel during the recording of each data page. A test image transmitted through the system measures the spatial nonuniformities, and the appropriate inverse filter is imposed upon the data page and recorded in the storage material. On readout, the output signal values are then spatially uniform, perturbed only by random noise sources. Experimental results of using this predistortion technique in a pixel-matched holographic storage system are shown. Under conditions of high volumetric density, raw bit-error-rate (BER) improvements of 6–8  orders of magnitude are obtained (from 10-4 to <10-10). The second technique uses a phase shift during holographic storage to subtract from bright OFF pixels. Under conditions of low spatial light modulator contrast, BER improvements of 6  orders of magnitude (from 10-2 to 10-8) are demonstrated.

© 1998 Optical Society of America

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References

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1997

1995

D. Psaltis and F. Mok, Sci. Am. 273(5), 70 (1995).
[CrossRef]

X. An and D. Psaltis, Opt. Lett. 20, 1913 (1995).
[CrossRef] [PubMed]

1994

S. Hunter, C. Solomon, S. Esener, J. E. Ford, A. S. Dvornikov, and P. M. Rentzepis, Opt. Memory Neural Networks 3, 151 (1994).

1988

1987

An, X.

Ashley, J.

Brady, D.

Burr, G. W.

Coufal, H.

Dvornikov, A. S.

S. Hunter, C. Solomon, S. Esener, J. E. Ford, A. S. Dvornikov, and P. M. Rentzepis, Opt. Memory Neural Networks 3, 151 (1994).

Esener, S.

S. Hunter, C. Solomon, S. Esener, J. E. Ford, A. S. Dvornikov, and P. M. Rentzepis, Opt. Memory Neural Networks 3, 151 (1994).

Ford, J. E.

S. Hunter, C. Solomon, S. Esener, J. E. Ford, A. S. Dvornikov, and P. M. Rentzepis, Opt. Memory Neural Networks 3, 151 (1994).

Grygier, R. K.

Hoffnagle, J. A.

Hunter, S.

S. Hunter, C. Solomon, S. Esener, J. E. Ford, A. S. Dvornikov, and P. M. Rentzepis, Opt. Memory Neural Networks 3, 151 (1994).

Jefferson, C. M.

Marcus, B.

Mok, F.

D. Psaltis and F. Mok, Sci. Am. 273(5), 70 (1995).
[CrossRef]

Psaltis, D.

Renn, A.

Rentzepis, P. M.

S. Hunter, C. Solomon, S. Esener, J. E. Ford, A. S. Dvornikov, and P. M. Rentzepis, Opt. Memory Neural Networks 3, 151 (1994).

Solomon, C.

S. Hunter, C. Solomon, S. Esener, J. E. Ford, A. S. Dvornikov, and P. M. Rentzepis, Opt. Memory Neural Networks 3, 151 (1994).

Wagner, K.

Wild, U. P.

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Figures (4)

Fig. 1
Fig. 1

Histograms of detected pixel values for holograms before and after use of the predistortion technique.

Fig. 2
Fig. 2

Raw BER versus aperture size for transmitted images and holograms corrected with the predistortion technique.

Fig. 3
Fig. 3

Histogram for a hologram with four gray levels, created with predistortion.

Fig. 4
Fig. 4

Histograms for holograms before and after predistortion with subtraction from too-bright off pixels.

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