Digital Image Diffusion Technique for Suppressing Interpage Crosstalk in Holographic Data Storage

Shibukawa, Atsushi; Okamoto, Atsushi; Wakayama, Yuta; Tomita, Akira; Funakoshi, Hisatoshi; Sato, Kunihiro

doi:10.7567/jjap.52.09ld03

Cited by 7 publications

(3 citation statements)

References 22 publications

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“…This is because the noise from an undesired hologram was reduced by the random diffuser. 34) Thus, by comparing the red and blue lines in Fig. 9, we can confirm the pure effect of the proposed method in which multiple data pages are simultaneously recorded.…”

Section: Effect On Recording Densitymentioning

confidence: 55%

Digital image multiplexing/demultiplexing method using spatial spectral diffusion and virtual phase conjugation technique for reduction of dynamic range consumption in holographic medium

Goto

Okamoto

Takabayashi

et al. 2017

Jpn. J. Appl. Phys.

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The recording density in holographic data storage (HDS) systems is determined by the dynamic range of the recording medium. If a hologram is recorded with a small exposure, the consumption amount of the dynamic range per hologram is reduced, and the recording density can be improved. In this report, we propose a digital image multiplexing/demultiplexing method using spatial spectral diffusion and a virtual phase conjugation technique to reduce the consumption amount of the dynamic range in a recording medium. In our method, multiple signals are simultaneously recorded in a medium by multiplexing those signals using a beam combiner before recording, unlike the general multiplexing method of HDS. Then, each original signal can be reproduced independently by utilizing the property of a random diffuser and a phase-conjugated light. In the simulation, we confirmed that our method can improve the recording density because the consumption of the dynamic range is reduced.

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Section: Effect On Recording Densitymentioning

confidence: 55%

Digital image multiplexing/demultiplexing method using spatial spectral diffusion and virtual phase conjugation technique for reduction of dynamic range consumption in holographic medium

Goto

Okamoto

Takabayashi

et al. 2017

Jpn. J. Appl. Phys.

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“…Thus, modal cross-talks (MXTs), which are called interpage XTs in the HDS, are generated from nonreconstruction holograms. 24) Therefore, the mode separation performance of the VHDM is degraded because of the intensity overlap between spatial modes. Previous studies have indicated that the separation performance with a large overlap is lower than that with a small overlap, thereby supporting the aforementioned assertion.…”

Section: Introductionmentioning

confidence: 99%

Spatial mode demultiplexing technique using angularly multiplexed volume holograms with a phase plate

Shimizu

Okamoto

Fumiya

et al. 2017

Jpn. J. Appl. Phys.

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In this paper, we propose a spatial mode demultiplexing technique that uses a volume holographic demultiplexer (VHDM) with a phase plate. The VHDM can separate the multiplexed spatial modes with a single device by using angularly multiplexed volume holograms. In the VHDM, modal cross-talks, which are called inter-page cross-talks in the holographic data storages, are generated, and hence the separation performance of the VHDM is degraded by the intensity overlap between spatial modes. Therefore, we propose a novel scheme wherein phase modulation with a phase plate is added to the conventional scheme. The proposed scheme can achieve high separation performance by modulating the phase of spatial modes to reduce the intensity overlap. In this study, we demonstrated the basic operation of the proposed method for a specific linearly polarized mode group. The separation performance of the VHDM was observed to be markedly improved by the proposed method.

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“…Multiplexed recording by use of a double-random phase encryption [13] can eliminate a part of this crosstalk. The crosstalk is diffused with a conjugate reconstruction and a random diffuser in a Fourier plane [14,15]. This method, however, makes an optical system complicated due to the requirement for a random diffuser and its precise alignment.…”

mentioning

confidence: 99%

Multiplexed recording with uncorrelated computer-generated reference patterns in coaxial holographic data storage

2015

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A computer-generated reference pattern (CGRP) allows improvement in light efficiency and the quality of reconstructed data in coaxial holographic data storage. In this Letter, a multiplexed recording method with uncorrelated CGRPs is proposed. With this method, crosstalk from adjacent holograms is suppressed without shifting a medium. To confirm the feasibility of the proposed method experimentally, shift selectivity is investigated, and then multiplexed recording is performed. Experimental results show that the proposed method enables high-density recording compared with conventional shift multiplexing. In addition, a theoretical analysis implies that at least 100 uncorrelated CGRPs can be designed and used for multiplexed recording.

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Digital Image Diffusion Technique for Suppressing Interpage Crosstalk in Holographic Data Storage

Cited by 7 publications

References 22 publications

Digital image multiplexing/demultiplexing method using spatial spectral diffusion and virtual phase conjugation technique for reduction of dynamic range consumption in holographic medium

Digital image multiplexing/demultiplexing method using spatial spectral diffusion and virtual phase conjugation technique for reduction of dynamic range consumption in holographic medium

Spatial mode demultiplexing technique using angularly multiplexed volume holograms with a phase plate

Multiplexed recording with uncorrelated computer-generated reference patterns in coaxial holographic data storage

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