Real time servo control of the holographic data storage system with an additional servo beam

Yang, Joo Young; Kim, Sang-Hoon; Kim, Jang Hyun; Yang, Hyunseok; Park, Joo-Youn; Park, No−Cheol; Park, Young−Pil

doi:10.1007/s00542-007-0378-1

Cited by 6 publications

(6 citation statements)

References 7 publications

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“…where C is a geometry-dependent but time-independent constant and Δθ is replaced by the time-dependent parameter θ(t). Equation (24) indicates that the vibration waveform is converted to the phase term averaged over time. It indicates that the time-integrated distribution of the vibration waveform determines the weighting factor f w .…”

Section: Vibration Effect Evaluation Methodsmentioning

confidence: 99%

“…Yang and coworkers have suggested applying an additional beam to a medium to detect the deviation of the medium. 24,25) Lim et al proposed using discrete prepatterns for a tracking servo. 26) Horimai et al proposed servo signal generation using prewritten pits and a laser whose wavelength is different from those used for recording and reconstruction.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

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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Section: Vibration Effect Evaluation Methodsmentioning

confidence: 99%

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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“…It is able to measure disturbances occurring on the radial direction of the disk by receiving the TES from the reconstructed servo track (Yang et al 2007). A PD array which is constituted with four elements is aligned in the system to detect the servo track as shown in Fig.…”

Section: Tracking Error Detectionmentioning

confidence: 99%

Design of tracking servo control system for holographic data storage

Yang

Kim

et al. 2009

Microsyst Technol

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Holographic data storage is a strong candidate for the next generation archive storage device. However, disturbances such as external shock, vibration, flutter and eccentricity of the disk affects the holographic data storage device. Thus, tracking servo control is necessary in order to enhance the signal noise ratio and reduce the bit error rate and retrieve the data accurately. It is also inevitable to face track overlapping problem if there is no datum to apply servo control during the recording process. In this research, we suggest a method forming a holographic servo track to detect the tracking error signal continuously without using any additional laser diode or pre-format layer. The tracking servo controller is designed to improve the track following performance, and the validity of the proposed method is confirmed through experiments on our holographic data storage system.

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“…The media used in this HDSS is a 5mm thick 0.03% Fe-doped LiNbO3 crystal. And the NA of the collimating lens is 0.38 [8].…”

Section: Holographic Recording Systemmentioning

confidence: 99%

Next generation storage technology in magnetic and optical recording system

Park

2008

Eighth International Symposium on Optical Storage and 2008 International Workshop on Information Data Storage

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Recently, in the magnetic recording, head assisted magnetic recording (HAMR) and patterned media (PM) technology have been considered as strong candidates to achieve the high recording density beyond the super-paramagnetic limit.Using E-beam recording (EBR) and UV nano-imprinting, the PM with nano-scale pitches and tracks is fabricated effectively and delicately. And the optical throughput of the HARM system is improved by optimizing the grating and the media geometry. In the optical storage, next generation technologies are the near filed recording (NFR) and the holographic recording. The modified NFR gap servo mechanism is developed and clearance of 30nm is uniformly maintained. In addition, the anti-shock servo algorithm resists against the external shock of over 2G@10ms. The advanced holographic system compensates the errors from disturbance by finding the max intensity angle with back propagation algorithm for angle direction and shifting the reference beam with glass plate controlled by a servo motor for fractal direction.

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Real time servo control of the holographic data storage system with an additional servo beam

Cited by 6 publications

References 7 publications

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

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

Design of tracking servo control system for holographic data storage

Next generation storage technology in magnetic and optical recording system

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