Abstract
Among the techniques that have been envisaged for page-oriented data storage in volume holographic memories, orthogonal phase-coded multiplexing [1,2] offers several advantages over angular and wavelength multiplexing having the same storage capacity. A holographic data storage system based on phase-coded multiplexing operates with a fixed wavelength and a fixed geometry, avoiding mechanically moving parts. At the same time it provides short readout times and high energy efficiency. The signal-to-noise ratio of phasecoded multiplexing for a given number of holograms is more than two orders of magnitude higher than for angular and wavelength multiplexing [3,4]. Moreover, it allows one to perform arithmetic operations such as addition, subtraction or inversion of different data pages directly during readout of the memory [5–8]. Therefore, using phase-coded optical memories, high-capacity data storage and high-speed data processing become possible simultaneously. Additionally, orthogonal phase-coded multiplexing can be combined with a random-phase key in order to realize an encrypted holographic data storage system [9].
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Denz, C., Müller, KO., Visinka, F., Tschudi, T. (2000). A Demonstration Platform for Phase-Coded Multiplexing. In: Coufal, H.J., Psaltis, D., Sincerbox, G.T. (eds) Holographic Data Storage. Springer Series in Optical Sciences, vol 76. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-540-47864-5_28
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DOI: https://doi.org/10.1007/978-3-540-47864-5_28
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