Spatial run-length limited code for reduction of hologram size in holographic data storage

Yoshida, Shuhei; Takahata, Yosuke; Horiuchi, Shuma; Yamamoto, Masaaki

doi:10.1016/j.optcom.2015.08.088

Cited by 5 publications

(1 citation statement)

References 17 publications

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“…Holographic memories have been focused on as nextgeneration optical storage systems with high storage density and high transmission speed. [1][2][3][4][5][6][7][8][9] In recent years, the recording scheme of spatial quadrature amplitude modulated (SQAM) signal, whose amplitude and phase are individually modulated with multi-levels, has been studied. [10][11][12][13][14] Since the information amount of one symbol constituting the page data increases, it is an effective means for improving the recording capacity of the memory.…”

Section: Introductionmentioning

confidence: 99%

A two-step exposure method with interleaved phase pages for recording of SQAM signal in holographic memory

Honma¹,

Funakoshi²

2019

Jpn. J. Appl. Phys.

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We have proposed a two-step exposure method (TEM) for recording spatial quadrature amplitude modulated (SQAM) signals in holographic memories. We consider two generation methods of the phase pages used in the TEM and investigate the reproduction accuracy of the SQAM signal. One of them is to produce the phase pages by arranging from the conventional two-phase pages alternately. We indicate that it is able to reduce the consumption of photopolymerizable monomers in the photopolymer effectively by using the phase distribution. It also suppresses the adverse effect on the reproduction accuracy of SQAM signal by intensity variation of the multiplexed holograms. Further, we propose the method to produce the SQAM signals by a one-shot recording based on the analysis.

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