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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Vol. 37, Iss. 23 — Aug. 10, 1998
  • pp: 5431–5443

Experimental evaluation of user capacity in holographic data-storage systems

Geoffrey W. Burr, Wu-chun Chou, Mark A. Neifeld, Hans Coufal, John A. Hoffnagle, and C. Michael Jefferson  »View Author Affiliations


Applied Optics, Vol. 37, Issue 23, pp. 5431-5443 (1998)
http://dx.doi.org/10.1364/AO.37.005431


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Abstract

An experimental procedure for determining the relation between the number of stored holograms and the raw bit-error rate (BER) (the BER before error correction) of a holographic storage system is described. Compared with conventional recording schedules that equalize the diffraction efficiency, scheduling of recording exposures to achieve a uniform raw BER is shown to improve capacity. The experimentally obtained capacity versus the raw-BER scaling is used to study the effects of modulation and error-correction coding in holographic storage. The use of coding is shown to increase the number of holograms that can be stored; however, the redundancy associated with coding incurs a capacity cost per hologram. This trade-off is quantified, and an optimal working point for the overall system is identified. This procedure makes it possible to compare, under realistic conditions, system choices whose impact cannot be fully analyzed or simulated. Using LiNbO3 in the 90° geometry, we implement this capacity-estimation procedure and compare several block-based modulation codes and thresholding techniques on the basis of total user capacity.

© 1998 Optical Society of America

OCIS Codes
(040.1520) Detectors : CCD, charge-coupled device
(050.7330) Diffraction and gratings : Volume gratings
(070.2580) Fourier optics and signal processing : Paraxial wave optics
(090.0090) Holography : Holography
(090.2900) Holography : Optical storage materials
(210.2860) Optical data storage : Holographic and volume memories

History
Original Manuscript: February 24, 1998
Revised Manuscript: May 18, 1998
Published: August 10, 1998

Citation
Geoffrey W. Burr, Wu-chun Chou, Mark A. Neifeld, Hans Coufal, John A. Hoffnagle, and C. Michael Jefferson, "Experimental evaluation of user capacity in holographic data-storage systems," Appl. Opt. 37, 5431-5443 (1998)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-37-23-5431

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