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Applied Optics

Applied Optics


  • Vol. 42, Iss. 14 — May. 10, 2003
  • pp: 2546–2559

Experimental demonstration of gray-scale sparse modulation codes in volume holographic storage

Brian M. King, Geoffrey W. Burr, and Mark A. Neifeld  »View Author Affiliations

Applied Optics, Vol. 42, Issue 14, pp. 2546-2559 (2003)

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We discuss experimental results of a versatile nonbinary modulation and channel code appropriate for two-dimensional page-oriented holographic memories. An enumerative permutation code is used to provide a modulation code that permits a simple maximum-likelihood detection scheme. Experimental results from the IBM Demon testbed are used to characterize the performance and feasibility of the proposed modulation and channel codes. A reverse coding technique is introduced to combat the effects of error propagation on the modulation-code performance. We find experimentally that level-3 pixels achieve the best practical results, offering an 11–35% improvement in capacity and a 12% increase in readout rate as compared with local binary thresholding techniques.

© 2003 Optical Society of America

OCIS Codes
(090.7330) Holography : Volume gratings
(210.2860) Optical data storage : Holographic and volume memories

Original Manuscript: July 28, 2002
Revised Manuscript: January 24, 2003
Published: May 10, 2003

Brian M. King, Geoffrey W. Burr, and Mark A. Neifeld, "Experimental demonstration of gray-scale sparse modulation codes in volume holographic storage," Appl. Opt. 42, 2546-2559 (2003)

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