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18 August 1995 Compact 3D optical data storage and retrieval system
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A compact, rugged and low-cost 3-D optical storage system based on space and phase-code multiplexed volume holograms is presented in this paper. Holograms are recorded at a 2-D (e.g., 16 multiplied by 16) grid of locations in a photorefractive crystal. At each location, multiple holograms are stored via phase-code multiplexing. Compared with the commonly utilized angle multiplexing, the phase-code multiplexing permits a high storage capacity without alignment problems. In contrast to wavelength multiplexing, phase-code multiplexing does not require bulky and high-cost components for wavelength tuning and can switch very quickly from one hologram to another. By combining the space and phase-code multiplexing techniques, such a 3-D optical storage system has the potential to store 1 terabit information and to retrieve data at the rate of gigabits per second. In this paper, the optical architecture is described and the system design considerations are discussed. The preliminary proof-of- concept experimental results are reported.
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Xiangyang Yang and Shaomin Zhou "Compact 3D optical data storage and retrieval system", Proc. SPIE 2529, Photorefractive Fiber and Crystal Devices: Materials, Optical Properties, and Applications, (18 August 1995);

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