Symbol Error Characteristics of Hybrid-Modulated Holographic Data Storage by Intensity and Multi Phase Modulation
スポンサーリンク
概要
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For the purpose of increasing the data density of holographic memories, we propose a novel signal modulation method named hybrid modulation method, which is a combination of multi level phase-modulated signals and intensity-modulated signals. As a first step, we show that the data density of holographic data storage is mainly determined by multiplexing numbers and by coding efficiency in input signals. In this study, we focus on increasing coding efficiency using the hybrid modulation method. From the results of recording and reading simulations based on the fast-Fourier transform beam propagation method, the hybrid modulation method achieves approximately 2 times higher data density than the conventional methods of two-level phase-only modulation and two-level intensity-only modulation.
- 2011-09-25
著者
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Okamoto Atsushi
Graduate School Of Engineering Hokkaido University
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Tomita Akihisa
Graduate School Of Information Science And Technology Hokkaido University
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Takabayashi Masanori
Graduate School of Information and Technology, Hokkaido University, Sapporo 060-0814, Japan
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Bunsen Masatoshi
Department of Electronics Engineering and Computer Science, Fukuoka University, 8-19-1 Nanakuma, Johnan-ku, Fukuoka 814-0180, Japan
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Tomita Akihisa
Graduate School of Information and Technology, Hokkaido University, Sapporo 060-0814, Japan
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