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Title of Journal: OPT REV

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Abbravation: Optical Review

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Optical Society of Japan

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DOI

10.1007/s10618-014-0397-3

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1349-9432

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Signal quality improvement of holographic data sto

Authors: Yosuke Takahata Yo Kondo Shuhei Yoshida Manabu Yamamoto
Publish Date: 2010/06/05
Volume: 17, Issue: 3, Pages: 204-209
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Abstract

Holographic data storage is being widely studied for the purpose of developing nextgeneration large optical memories A prospective use of this type of memory is in building image archives in largescale data centers In particular demand for energy conservation at data centers and therefore for holographic data storage is growing In holographic data storage interference between bits occurs owing to wave aberration in the optical system shrinkage of the medium and crosstalk noise from neighboring holograms during multiplex recording as a result of the interference the reproduced image deteriorates and the bit error rate BER increases In this study to reduce the BER in both offaxistype recording and coaxialtype recording a twodimensional finite impulse response FIR filter is applied to a reproduced image that has been recorded by angle multiplex recording and shift multiplex recording First for the optimization of the FIR filter coefficients the linear minimum mean square error LMMSE method is applied this method optimizes the coefficients by reducing the BER Furthermore for evaluating the optimization performance of the LMMSE method the optimization performance is compared with that of the realcoded genetic algorithm RCGA which has the capability to search a wide range of coefficients The optimization by the LMMSE method has been found to be excellent for offaxistype recording but not for coaxialtype recording It is speculated that this is because of the brightness irregularity in the reproduced image resulting from crosstalk On the other hand a marked reduction in the BER is observed using the RCGA despite the brightness irregularity In this study the effectiveness of the LMMSE method for signals recorded by coaxialtype recording in which large brightness irregularity is expected is examined using automatic gain control AGC It is found that the application of AGC reduces the BER even in the case of coaxialtype recording

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