Holographic Memories Using 2-Dimensional Phase-Code Multiplexing Method
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概要
- 論文の詳細を見る
When implementing a phase-code multiplexing method in real holographic storage systems, there are several factors of cross-talk noise which degrade signal-to-noise ratio (SNR). To reduce such problems, we developed a new and practical phase-code multiplexing method using a 2-dimensional high-resolution phase-only spatial light modulator (P-SLM) which encodes a reference beam with orthogonal phase codes. Theoretically and experimentally, we found that removing a particular all 0 phase code which is always generated by Walsh-Hadamard matrices is quite effective in reducing the cross-talk noise. Moreover, we found that periodically tiled phase-code patterns reduce the cross-talk noise due to inhomogeneous illumination of the P-SLM in real systems. By combining these methods, we achieved bit error rates (BER) for multiplexed holograms on the order of $10^{-4}$–$10^{-3}$ without error correction.
- Published by the Japan Society of Applied Physics through the Institute of Pure and Applied Physicsの論文
- 2004-07-15
著者
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Kihara Nobuhiro
Depertment 1, Optical Disk Development Division, Optical System Development Group, Broadband Network Company, SONY Corporation, 6-7-35 Kitashinagawa, Shinagawa-ku, Tokyo 141-0001, Japan
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Baba Shigeyuki
Depertment 1, Optical Disk Development Division, Optical System Development Group, Broadband Network Company, SONY Corporation, 6-7-35 Kitashinagawa, Shinagawa-ku, Tokyo 141-0001, Japan
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Ezura Megumi
Depertment 1, Optical Disk Development Division, Optical System Development Group, Broadband Network Company, SONY Corporation, 6-7-35 Kitashinagawa, Shinagawa-ku, Tokyo 141-0001, Japan