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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Vol. 37, Iss. 23 — Aug. 10, 1998
  • pp: 5377–5385

Balancing interpixel cross talk and detector noise to optimize areal density in holographic storage systems

María-P. Bernal, Geoffrey W. Burr, Hans Coufal, and Manuel Quintanilla  »View Author Affiliations


Applied Optics, Vol. 37, Issue 23, pp. 5377-5385 (1998)
http://dx.doi.org/10.1364/AO.37.005377


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Abstract

We investigate the effects of interpixel cross talk and detector noise on the areal storage density of holographic data storage. A numerical simulation is used to obtain the bit-error rate (BER) as a function of hologram aperture, pixel fill factors, and additive Gaussian intensity noise. We consider the effect of interpixel cross talk at an output pixel from all possible configurations of its 12 closest-neighbor pixels. Experimental verification of this simulation procedure is shown for several fill-factor combinations. The simulation results show that areal density is maximized when the aperture coincides with the zero order of the spatial light modulator (SLM) (Nyquist sampling condition) and the CCD fill factor is large. Additional numerical analysis including finite SLM contrast and fixed-pattern noise show that, if the fixed-pattern noise reaches 6% of the mean signal level, the SLM contrast has to be larger than 6:1 to maintain high areal density. We also investigate the improvement of areal density when error-prone pixel combinations are forbidden by using coding schemes. A trade-off between an increase in areal density and the redundancy of a coding scheme that avoids isolated-on pixels occurs at a code rate of approximately 83%.

© 1998 Optical Society of America

OCIS Codes
(040.1520) Detectors : CCD, charge-coupled device
(050.1220) Diffraction and gratings : Apertures
(050.1960) Diffraction and gratings : Diffraction theory
(070.2580) Fourier optics and signal processing : Paraxial wave optics
(070.2590) Fourier optics and signal processing : ABCD transforms
(210.2860) Optical data storage : Holographic and volume memories

History
Original Manuscript: December 24, 1997
Revised Manuscript: April 29, 1998
Published: August 10, 1998

Citation
María-P. Bernal, Geoffrey W. Burr, Hans Coufal, and Manuel Quintanilla, "Balancing interpixel cross talk and detector noise to optimize areal density in holographic storage systems," Appl. Opt. 37, 5377-5385 (1998)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-37-23-5377

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