Multilayer Collinear Holographic Memory with Movable Random Phase Mask

Shibukawa, Atsushi; Okamoto, Atsushi; Tomita, Akira; Takabayashi, Masanori; Sato, Kunihiro

doi:10.1143/jjap.50.09me10

Cited by 8 publications

(6 citation statements)

References 17 publications

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“…In the correlation-based multiplexing, also called phase-code multiplexing, multiple data pages are recorded using uncorrelated reference beams without displacing a recording medium. A straightforward way for generating uncorrelated reference beams is the use of multiple random phase masks provided by an SLM or a diffuser [ 27 , 28 , 29 ]. The use of random phase masks, however, wastes the light energy of a reference beam because the spatial-frequency spectrum of a reference beam is widely spread and filtered with an aperture.…”

Section: Introductionmentioning

confidence: 99%

Correlation-Based Multiplexing of Complex Amplitude Data Pages in a Holographic Storage System Using Digital Holographic Techniques

Nobukawa

Nomura

2017

Polymers

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Holographic recording media can store the amplitude and the phase, or the complex amplitude, of a beam on the basis of holography. Owing to this characteristic, digital data can be encoded onto the complex amplitude of a signal beam in holographic data storage. However, most of conventional holographic storage systems encode digital data onto the amplitude alone because there are difficulties for modulating and detecting the phase. To solve the difficulties, a holographic storage system using digital holographic techniques has been proposed. With the help of digital holographic techniques, it is possible to modulate and detect the complex amplitude of a signal beam. Moreover, the proposed system can modulate the complex amplitude of a reference beam. In this paper, by making use of the capability, a correlation-based multiplexing with uncorrelated reference beams is demonstrated in the proposed system. Multiple holograms can be recorded in the same volume of a recording medium with no need for mechanical movements. Experimental results show that the proposed system with a correlation-based multiplexing can improve the storage capacity and can utilize the full potential of a recording medium without crosstalk noise stem from the optical setup.

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Section: Introductionmentioning

confidence: 99%

Correlation-Based Multiplexing of Complex Amplitude Data Pages in a Holographic Storage System Using Digital Holographic Techniques

Nobukawa

Nomura

2017

Polymers

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“…These demands in abilities could be satisfied by a holographic data storage (HDS) system expected as a nextgeneration optical memory. 1,2) A straightforward way for achieving high recording capacity in HDS is to multiplex holograms with as small interval as possible in a recording medium, the theoretical limit of which is called the hologram selectivity, which is the important index for evaluating the competence of multiplexing methods. 3,4) In the case of the collinear shift multiplexing method as an example, it has an extremely sharp selectivity of nearly 0.5 m along the in-plane direction of the recording medium.…”

Section: Introductionmentioning

confidence: 99%

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

Shibukawa

Okamoto

Wakayama

et al. 2013

Jpn. J. Appl. Phys.

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To suppress interpage crosstalk that strongly restricts holographic data storage capacity, a digital image diffusion technique was proposed. In this technique, signal and crosstalk components are separated from the propagation angle difference produced by using a random diffuser and the nature of phase conjugate lights. The most attractive feature of the technique is that crosstalk suppression can be conducted while mostly keeping the conventional holographic data storage system unchanged by integrating optical processing and digital processing effectively. The connection between the two types of processing is realized by using two spatial light modulators for complex amplitude generation and phase detection methods for complex amplitude measurement. The simulation results showed that the proposed technique could increase the recording density 5.5-fold and reduce the shift pitch by a factor of 5 in comparison with conventional multiplexing methods when the diffusion angle of the diffuser is 10°.

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“…A holographic data storage (HDS) system [1][2][3][4][5][6][7][8] has long been known as a leading candidate for a post Blu-ray disc because this page-oriented three-dimensional optical memory provides a high data density 9) and a high data transfer rate 10) simultaneously. Recently, as a new dimension in the HDS system, the recording/reconstruction of phase modulation signals has been particularly focused on owing to the following merits: [11][12][13][14] it is possible to smoothen undesired intensity peaks on a recording plane 15) and increasing modulation levels is readily realized.…”

Section: Introductionmentioning

confidence: 99%

Double-Referential Holography and Spatial Quadrature Amplitude Modulation

Zukeran

Okamoto

Takabayashi

et al. 2013

Jpn. J. Appl. Phys.

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We proposed a double-referential holography (DRH) that allows phase-detection without external additional beams. In the DRH, phantom beams, prepared in the same optical path as signal beams and preliminary multiplexed in a recording medium along with the signal, are used to produce interference fringes on an imager for converting a phase into an intensity distribution. The DRH enables stable and high-accuracy phase detection independent of the fluctuations and vibrations of the optical system owing to medium shift and temperature variation. Besides, the collinear arrangement of the signal and phantom beams leads to the compactness of the optical data storage system. We conducted an experiment using binary phase modulation signals for verifying the DRH operation. In addition, 38-level spatial quadrature amplitude modulation signals were successfully reproduced with the DRH by numerical simulation. Furthermore, we verified that the distributed phase-shifting method moderates the dynamic range consumption for the exposure of phantom beams.

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Multilayer Collinear Holographic Memory with Movable Random Phase Mask

Cited by 8 publications

References 17 publications

Correlation-Based Multiplexing of Complex Amplitude Data Pages in a Holographic Storage System Using Digital Holographic Techniques

Correlation-Based Multiplexing of Complex Amplitude Data Pages in a Holographic Storage System Using Digital Holographic Techniques

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

Double-Referential Holography and Spatial Quadrature Amplitude Modulation

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