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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Vol. 40, Iss. 11 — Apr. 10, 2001
  • pp: 1832–1842

Blockwise data detection for spectral hole-burning memories

Lilin Zhang and Mark A. Neifeld  »View Author Affiliations


Applied Optics, Vol. 40, Issue 11, pp. 1832-1842 (2001)
http://dx.doi.org/10.1364/AO.40.001832


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Abstract

We consider the retrieval of data from a time-domain spectral hole-burning (SHB) memory system. A new iterative log-likelihood (ILL) algorithm is used to reliably detect corrupted retrieved data signals. It is a blockwise technique that takes advantage of the known SHB system characteristics to mitigate time-varying intersymbol interference and detector shot noise. We present bit-error-rate results obtained with the ILL algorithm and five other typical methods (i.e., precompensator, simple threshold, adaptive threshold, a simple Wiener filter, and an adaptive Wiener filter). Results show that the ILL algorithm outperforms all five techniques and hence offers improved SHB storage capacity. In a SHB system with typical material parameters, we find that ILL offers a storage capacity gain of 197% as compared with simple thresholding.

© 2001 Optical Society of America

OCIS Codes
(040.1880) Detectors : Detection
(210.4680) Optical data storage : Optical memories

History
Original Manuscript: June 7, 2000
Revised Manuscript: December 5, 2000
Published: April 10, 2001

Citation
Lilin Zhang and Mark A. Neifeld, "Blockwise data detection for spectral hole-burning memories," Appl. Opt. 40, 1832-1842 (2001)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-40-11-1832

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