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R&D: High-Density Recording in Holographic System

By Hitachi

This article was published on August 5, 016 by the Japanese Journal of Applied Physics Journal, Volume 55, Number 9S and written by Kazuyuki Tajima, Yusuke Nakamura and Taku Hoshizawa, Hitachi, Ltd.

High-density recording in holographic data storage system by dual 2-level run-length-limited modulation

Abstract: An angular-multiplexing holographic memory system is one candidate for future optical data storage systems because of capability for abilities of ‘high-density recording’ and ‘high-speed recording and reproduction’. We have developed a high-density recording method by reducing the hologram size in a disc to half by 2-level run-length-limited (RLL) modulation. In addition, to achieve further high-density recording, we introduce 4-level recording. However, 4-level RLL modulation requires high computational complexity in general. Therefore, we developed the dual 2-level RLL modulation method that can suppress increase in computational complexity and has good compatibility with the conventional holographic data storage system (HDSS). The high-density effect of the method was experimentally confirmed by the Fourier images and SNR of reproduced images. Consequently, the dual 2-level RLL modulation enables a doubling of the recording density, this gave an inspection for realizing a next-generation HDSS with the recording density of 4.8Tb/in².

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