Double-Referential Collinear Holographic Memory and Spatial Quadrature Amplitude Modulation

Okamoto, Atsushi; Zukeran, Keisuke; Shibukawa, Atsushi; Takabayashi, Masanori

doi:10.1364/isom_ods.2011.otud12

Cited by 2 publications

(3 citation statements)

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“…The above problems can be completely solved by the recently proposed double-referential holography (DRH). 13) In this method, the additional light is previously multiplexed in the medium along with the signal in the same optical axis, and then these lights are simultaneously readout from multiplexed holograms, so interferograms formed by the DRH are not affected by optics fluctuation or various condition changes of the medium. In addition, Colomb et al reported that it is possible to compensate for phase aberrations and image distortions by objective lenses using the phase detection method in the computer.…”

Section: Complex Amplitude Measurementmentioning

confidence: 99%

“…By this technique, diffraction light can be read from holograms in a standard manner without the phase conjugate readout light. Then, the complex field of that light is measured by phase detection methods [9][10][11][12][13] in the readout optics, and the subsequent phase conjugate reconstruction with the diffuser is conducted digitally on a computer. In this way, noise suppression without the phase conjugate readout light can be implemented by mostly maintaining a conventional HDS system.…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Complex Amplitude Measurementmentioning

confidence: 99%

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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“…A holographic memory has been expected as an optical memory which realizes a capacity of several terabytes on a disc and a fast data-transfer rate. For high density recording with high data-transfer and downsizing optical setup, various recording systems have been proposed such as architectures, [1][2][3][4][5][6][7] multiplexing methods, [8][9][10] data-coding methods, [11][12][13] signal processing, [14][15][16][17] and so on. Among them, a coaxial holographic memory is one of the promising architecture.…”

Section: Introductionmentioning

confidence: 99%

Coaxial Holographic Memory with Designed Reference Pattern on the Basis of Nyquist Aperture for High Density Recording

Nobukawa

Nomura

2013

Jpn. J. Appl. Phys.

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We propose the designed reference pattern on the basis of the Nyquist aperture for a coaxial holographic memory and investigate its recording performance by numerical simulations. By using the designed reference pattern, the Fourier power spectrum of a reference beam spreads uniformly within the Nyquist aperture, thereby an interference efficiency, a signal-to-noise ratio (SNR) and a symbol error rate (SER) are improved relative to conventional method with a random binary phase mask. Moreover, in the case of applying the 1.25 times aperture than the Nyquist size, the proposed method can record data pages with higher SNR and lower SER than that of conventional method with 2 times aperture than the Nyquist size. Numerical results imply that our proposed method can record data pages at a smaller area of recording media than that of conventional method.

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Double-Referential Collinear Holographic Memory and Spatial Quadrature Amplitude Modulation

Cited by 2 publications

References 0 publications

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

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

Coaxial Holographic Memory with Designed Reference Pattern on the Basis of Nyquist Aperture for High Density Recording

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