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Applied Optics

Applied Optics


  • Editor: Joseph N. Mait
  • Vol. 48, Iss. 1 — Jan. 1, 2009
  • pp: 55–63

Improved data search by zero-order (dc) peak filtering in a defocused volume holographic content-addressable memory

Bhargab Das, Joby Joseph, and Kehar Singh  »View Author Affiliations

Applied Optics, Vol. 48, Issue 1, pp. 55-63 (2009)

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Defocusing the recording material away from the Fourier plane is necessary to reduce the strong dc component and produce a more homogeneous object beam distribution in the hologram plane in volume holographic digital data-storage systems with amplitude-modulated data pages. However, content- addressable searching with defocused recording results in higher cross-correlation peak intensities. We present a method for performing a faithful content-addressable search in a defocused volume holographic data-storage system. A new dc-filtered content-addressable search method for defocused volume holographic data-storage systems with binary data pages is demonstrated. Both simulation and experimental results are presented. The experimental results show good discrimination capability and confirm the feasibility of the proposed technique.

© 2008 Optical Society of America

OCIS Codes
(090.4220) Holography : Multiplex holography
(200.4540) Optics in computing : Optical content addressable memory processors
(210.2860) Optical data storage : Holographic and volume memories

ToC Category:
Optical Data Storage

Original Manuscript: July 3, 2008
Revised Manuscript: October 26, 2008
Manuscript Accepted: November 11, 2008
Published: December 17, 2008

Bhargab Das, Joby Joseph, and Kehar Singh, "Improved data search by zero-order (dc) peak filtering in a defocused volume holographic content-addressable memory," Appl. Opt. 48, 55-63 (2009)

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