Dynamic dropout data restoring technique in all-optical fault tolerant holographic memory

Mitsuru Toishi; Atsushi Okamoto; Kunihiro Sato

doi:10.1117/12.517018

8 August 2003 Dynamic dropout data restoring technique in all-optical fault tolerant holographic memory

Mitsuru Toishi, Atsushi Okamoto, Kunihiro Sato

Author Affiliations +

Proceedings Volume 5123, Advanced Optical Devices, Technologies, and Medical Applications; (2003) https://doi.org/10.1117/12.517018
Event: 2003 Chapter books, 2003, Bellingham, WA, United States

Abstract

We have proposed the all-optical fault-tolerant holographic memory (FTHM) that automatically restores the dropout data by the constant rewriting method. In this method, the constant rewriting is conducted in the normal state or dropout state, so this data restoring is inefficient in terms of the restoration speed and the energy consumption. In this paper, we propose a dynamic dropout data restoring technique inthe FTHM. In this dynamic technique, the strength of the rewriting effect change in proportion to dropout level, i.e. if dropout technique can improve the restoring speed and reduce the energy consumption for restoring. First, we analyze the temporal response of the output efficiency and the hologram. Next we analyze the dependency of the output efficiency on the coupling strength in the two crystals and the incident condition of two beams, and estimate the coupling strength threshold and the ratio of the incident beams in order to maintain the stored data. Finally we experiment on the dropout data restoring by using BaTiO₃ as photorefractive crystal, and achieve the data restoring for 2-3 seconds and the over 25 minutes readout.

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Mitsuru Toishi, Atsushi Okamoto, and Kunihiro Sato "Dynamic dropout data restoring technique in all-optical fault tolerant holographic memory", Proc. SPIE 5123, Advanced Optical Devices, Technologies, and Medical Applications, (8 August 2003); https://doi.org/10.1117/12.517018

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KEYWORDS

Crystals

Laser crystals

Holograms

Holography

Beam analyzers

Ferroelectric materials

Modulation

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