Inorganic write-once disc with quadruple recording layers for Blu-ray Disc system

Mishima, Koji; Inoue, Hiroyasu; Aoshima, Masaki; Komaki, Tsuyoshi; Hirata, Hideki; Utsunomiya, Hajime

doi:10.1117/12.532524

Cited by 24 publications

(18 citation statements)

References 3 publications

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“…The calculated reflectivity for several numbers of layers is summarized in Table 1. These values are consistent with the previous reports of multi-layer discs [1][2][3][4][5][6][7].…”

Section: Methodssupporting

confidence: 94%

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Demonstration of readout-signal quality improvement by homodyne detection

et al. 2009

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We experimentally demonstrated improvement in optical disc readout signal quality by homodyne detection. We introduced an optical phase servo system as an alternative to the phase-diversity detection scheme for stabilization of the interference signal in homodyne detection, which resulted in further enhancement of readout signal quality. Experimental results indicate that at least a 16-layer recordable disc can be reliably read out with a jitter of less than 8% at a 1-mW read power by homodyne detection. The estimated amplification of signal amplitude was 13 times.

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“…The calculated reflectivity for several numbers of layers is summarized in Table 1. These values are consistent with the previous reports of multi-layer discs [1][2][3][4][5][6][7].…”

Section: Methodssupporting

confidence: 94%

“…Currently, write-once discs with up to six layers (200 Gbytes) and read-only memory (ROM) discs up to twenty-layers (500 Gbytes) have been demonstrated [1][2][3][4][5][6][7]. However, multilayer recording suffers from a serious decrease in signal level, which causes an insufficient signal-to-noise ratio (SNR).…”

Section: Introductionmentioning

confidence: 99%

Demonstration of readout-signal quality improvement by homodyne detection

et al. 2009

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“…Mishima, et al reported a write-once type quadrilayer recordable disc employing a high-transmissive ZnSiMg-O-S recording material for intervening layers. 5 Their quadrilayer structure, in contrast, was formed by spin-coated resin spacers.…”

Section: Introductionmentioning

confidence: 98%

High-density multilayer optical disc storage

et al. 2007

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High-density multilayer optical disc storage was investigated by employing advanced signal processing methods such as adaptive equalization and adaptive partial-response maximum-likelihood (PRML) detection. Preliminary experiments, recording on single-layer and dual-layer Blu-ray discs (BD), indicate storage capability of 33.3 GB/layer with adaptive 5-tap PRML. A new signal qualification method, sequenced amplitude margin quasi-error estimation (SAMQES), was introduced for high-density multilayer recording, and possibility toward a total storage capacity of 200 GB was examined by using a six-layer BD-Recordable disc. Despite coherent interlayer crosstalk and lower signal-to-noise ratio, SAMQES showed moderate increase from those in single-layer recording.

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“…These days, many impressive results of technical candidates for the next-generation optical discs have been reported in this field. The technical candidates include volumetric storage technology, [1][2][3][4][5][6] near-field technology, [7][8][9][10][11][12][13] and multilayer technology, [14][15][16][17][18][19][20] which is a volumetric storage technology. Among them, multilayer technology has a lot of advantages such as storage capacity, backward compatibility, and system practicability, and so on.…”

Section: Introductionmentioning

confidence: 99%

Advanced Radial Position Control of a Recording Beam for Super Multilayer Disc with Separated Guide Layer

Tanaka

Takahashi

Ogasawara

et al. 2013

Jpn. J. Appl. Phys.

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We have developed an advanced radial position control system for a super multilayer disc with a separated guide layer to realize stable recording on the plane recording layers located far from the guide layer. The developed system consists of an advanced sled servo system and a specially designed optics based on the advanced push–pull method. Recorded signals on all recording layers were evaluated by using integrated-maximum likelihood sequence error estimation (i-MLSE) as the evaluation indicator. As a result, we confirmed sufficient recorded signal qualities and feasibility at the quad-speed continuous recording with a constant track pitch of 0.32 µm, the same as that of Blu-ray disc (BD). We believe that our proposed concept is the most practical solution for the next-generation optical disc system and our control system is essential to realize stable multilayer recording with a constant track pitch.

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Inorganic write-once disc with quadruple recording layers for Blu-ray Disc system

Cited by 24 publications

References 3 publications

Demonstration of readout-signal quality improvement by homodyne detection

Demonstration of readout-signal quality improvement by homodyne detection

High-density multilayer optical disc storage

Advanced Radial Position Control of a Recording Beam for Super Multilayer Disc with Separated Guide Layer

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