Abstract

We describe what we believe to be a novel postprocessing algorithm for compensating for misregistrations between a detector array and the coherent image of a pixelated two-dimensional data page. A lookup table of baseline local offsets is combined with the dynamically measured global offset of the received data page, producing an estimate of the total lateral shift of each small block of pixels. A serial algorithm then reallocates the appropriate portion of the signal detected by each pixel to its neighbors, accounting for both the linear and the quadratic contributions introduced by coherent illumination of square-law detectors. This procedure can relax the tight constraints on page registration, optical distortion, and material shrinkage that currently hamper page-oriented holographic storage systems. Experimental results from a pixel-matched 1-Mpixel volume holographic system are presented, showing an increase in position tolerance (for a raw bit-error rate $<{10}^{-3}$) from $\pm 16\%$ to $\pm 40\%$ of the pixel pitch.

© 2001 Optical Society of America

Holographic data storage with arbitrarily misaligned data pages

Geoffrey W. Burr
Opt. Lett. 27(7) 542-544 (2002)

Volume holographic data storage at an areal density of 250 gigapixels/in.²

Geoffrey W. Burr, C. Michael Jefferson, Hans Coufal, Mark Jurich, John A. Hoffnagle, Roger M. Macfarlane, and Robert M. Shelby
Opt. Lett. 26(7) 444-446 (2001)

Density implications of shift compensation postprocessing in holographic storage systems

Laure Menetrier and Geoffrey W. Burr
Appl. Opt. 42(5) 845-860 (2003)

Modulation coding for pixel-matched holographic data storage

Geoffrey W. Burr, Jonathan Ashley, Hans Coufal, Robert K. Grygier, John A. Hoffnagle, C. Michael Jefferson, and Brian Marcus
Opt. Lett. 22(9) 639-641 (1997)

Pixel-matched holographic data storage with megabit pages

R. M. Shelby, J. A. Hoffnagle, G. W. Burr, C. M. Jefferson, M.-P. Bernal, H. Coufal, R. K. Grygier, H. Günther, R. M. Macfarlane, and G. T. Sincerbox
Opt. Lett. 22(19) 1509-1511 (1997)