By F. Balasa
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T. ). (2000). , Singh, K. (2009). Phase modulated gray-scale data pages for digital holographic data storage. Optics Communications, Vol. 282, No. 11, pp. , & Hong, J. (1996). Statistics of both optical and electrical noise in digital volume holographic data storage. Electronic Letters, Vol. 32, No. 1400–1402, ISSN 0013-5194 Haykin, S. (2002). Adaptive filter theory, Prentice Hall, 4th edition, ISBN 0130901261 He, A. & Mathew, G. (2006). Nonlinear equalization for holographic data storage systems.
The detector array is usually a charge coupled device (CCD) or a complementary metal oxide semiconductor (CMOS) image sensor. Minimum crosstalk from other pages when retrieving individual pages is attributed to a physical property called Bragg effect. Fig. 2 shows an example of the holographic data storage systems and Fig. 3 illustrates more details in the recording and reading processes. 3. Channel Defects Ideally, a pixel of the spatial light modulator is directly imaged onto a detector pixel in a pixel-matched holographic data storage system.
Fig. 5 pixel Signal Processing in Holographic Data Storage 21 along the X- and Y- directions, respectively; and the rotation angle, θ, is positive in the counter-clockwise direction. Fig. 4. Misalignment effects: magnification, translation and rotation of a detector page with respect to a spatial light modulator page. Optical and electrical noises are inevitable in holographic data storage systems. They include crosstalk noise, scattering noise, shot noise and thermal noise. Optical noise occurs during the read-out process when the storage medium is illuminated by coherent reference beams, resulting from optical scatter, laser speckle, etc.