A Novel Angle Servo for Holographic Data Storage System

Kim, Nakyoung; Jung, Kyuil; Kim, Kunyul; Yoon, Pilsang; Park, Joo Youn; Park, Jongyong

doi:10.1364/ods.2007.tue3

Cited by 5 publications

(4 citation statements)

References 3 publications

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“…It should be possible to resolve this issue by means of high-speed recording/reproducing, since the readout beam phase difference between the two pages can be reduced if a short interval is used. As several techniques to accelerate the speed have been proposed for the HDS, [29][30][31][32][33] we feel that the PDIA can be improved by using such a technique.…”

Section: X Y P I X Y P I X Y P B a X Y P A X Y P A X Y Pmentioning

confidence: 99%

Optical signal amplification between pages for holographic data storage

Yamazaki

Yamaguchi

2022

Jpn. J. Appl. Phys.

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This work proposes a page differential intensity amplification for optical signal amplification in the intensity multiplexing holographic data storage system. The proposed method detects the signals of four cameras and reconstructs the intensity difference between two pages. The reconstructed intensity difference is amplified by the ratio of the readout beam amplitude to the local oscillator beam amplitude. Experiments showed that the proposed method can achieve a more stable signal amplification than the conventional amplification technique. Moreover, signal detection is possible with half the light intensity of the readout beam compared to the conventional direct detection method. This corresponds to 1.4 times the recording capacity increase if the capacity is limited by M/#, or the reduction to half the readout exposure time.

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Section: X Y P I X Y P I X Y P B a X Y P A X Y P A X Y Pmentioning

confidence: 99%

Optical signal amplification between pages for holographic data storage

Yamazaki

Yamaguchi

2022

Jpn. J. Appl. Phys.

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“…14) Servoing during reconstruction has been researched because margin of disk tilt or that of a reference beam angle are very small (<0.01°) due to the high angular selectivity. [15][16][17] Compensation and servo techniques for disk movement is researched, especially because the rotation of hologram affects image reconstruction. 19) Kim et al proposed servo signal generation method for reference beam angle which utilize adjacent recorded data tracks.…”

Section: Introductionmentioning

confidence: 99%

“…19) Kim et al proposed servo signal generation method for reference beam angle which utilize adjacent recorded data tracks. 16) A. Hoskins et al proposed compensation technique for Bragg angle, degenerate angle and wavelength of reference beam using recovered page. 13) Then they develop a sequential recovery method by using basically the same principle.…”

Section: Introductionmentioning

confidence: 99%

Modeling and analysis of vibration effects on signal quality for angular multiplexed holographic data storage

Ishii

Shimada

Hoshizawa

et al. 2016

Jpn. J. Appl. Phys.

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Practical optical system design taking into account environmental factors is highly desirable. However it is in general a time consuming process which requires a massive iterations of numerical simulations. This is also one of the bottle necks of optical design for angular multiplexed holographic data storage system. To develop a practical method to evaluate effect of vibrations on signal quality, three-dimensional vibration model is developed which enables evaluation of vibration effect on normalized intensity level by using a single statistical figure of merit. Such single figure of meritis adopted to design a robust and efficient write strategy. The write strategy is applicable for wide range of vibration waveforms to increase write data transfer rate. Also optimum optical system parameters for angular multiplexed and monocular optical system are identified while maximizing tolerances of vibrations by applying the developed method. We propose NA 0.54 and pixel pitch 6.9m which can improve capacity and data transfer rate to 119% and 110% respectively compared to NA 0.6 reference design while keeping vibration margin as nearly identical to that of the reference design.

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“…Various servo methods have been proposed for HDSS, including tracking servo control using a pre-format layer in a collinear system, angle servo control using an optical filter, tilt servo control using a mechanical mechanism consisting of gears and hinges (Horimai et al 2005;Kim et al 2007;Song et al 2007). In previous research on tracking servo methods for HDSS in the Center for Information Storage Devises (CISD), we used an additional beam called a servo beam or recorded a servo track image with the data page.…”

Section: Introductionmentioning

confidence: 99%

Tracking servo method using reflective optical filter for holographic data storage system

Song

Kim

et al. 2011

Microsyst Technol

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Holographic data storage system is one of the next-generation data storage systems and is characterized by its high storage density and fast data transfer rate. However, holographic data storage systems are very sensitive to disturbances that affect the position of the media. Therefore, tracking servo control is needed to ensure a good performance of the system even if disturbances occur, such as eccentricity of the disk and external shock. In our previous researches on tracking servo methods, we used additional beams or recorded servo track images with data pages to record additional gratings with data pages. Therefore, the recording density may be reduced and the system may be complicated. In addition, the performance of the system may be compromised by cross-talk noise caused between the reference beams and additional beams. In this paper, we propose a tracking servo method using the residual beam, which is reflected by the reflective optical filter. This method does not require recording supplementary gratings or use additional beams, and only needs to record data pages. The residual beam is retrieved with desired retrieved beam by the reference beam and wasted during the retrieving process. We first constructed a holographic data storage system and designed a reflective optical filter to detect tracking error signals. After detecting the tracking error signals, a tracking servo controller using a lead-lag compensator was incorporated to reduce the tracking error signals. The performance of the designed controller was verified by simulated and experimental results. Finally, the performance of the tracking servo method was investigated by comparing the retrieved data images.

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A Novel Angle Servo for Holographic Data Storage System

Cited by 5 publications

References 3 publications

Optical signal amplification between pages for holographic data storage

Optical signal amplification between pages for holographic data storage

Modeling and analysis of vibration effects on signal quality for angular multiplexed holographic data storage

Tracking servo method using reflective optical filter for holographic data storage system

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