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advances in optical data storage technology

作者： Xun, Luo Dept. of Precision Instrument and Mechanics Tsinghua University

IDE interface and SCSI interface are the most widely used in the storage device. SCSI bus supports I/O queue but storage device with SCSI interface is some expensive, while IDE bus does not support queue by itself but its price is more acceptable. In this paper, we just propose a twin-queue algorithm to benefit from the trade-off of the performance of the SCSI interface and the cheapness of the IDE storage devices. There are two priority queues, one for the host to respond client requests via SCSI bus, the other for the IDE storage devices where the requested data really locate. It is proved that the performance of the device with twin-queue algorithm is much higher than that of the normal IDE optical drive which is not equipped with our firmware using stochastic queue service model.

关键词： optical data storage

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Organic photochromic materials for optical storage memory

Organic photochromic materials for optical storage memory

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Conference on advances in optical data storage technology

作者： Chen, Y Xiao, JP Fan, MG Yao, BL Chinese Acad Sci Inst Phys & Chem Beijing 100101 Peoples R China

ISBN: (纸本)0819455989

Two photochromic fulgides, 3-[2-(N, N-dimethylaniline)-5-methyl-xazolemethylene]-4-isopropylidenetetrahydrofuran-2, 5-dione (A) and 3-(1,2-dimethyl-5-phenyl-pyrrolmethylene)-4-isopropylidenetetrahydrofuran-2, 5-dione (B), doped in PMMA as candidates of dual-wavelength optical memory for parallel recording are demonstrated. With 488nm-laser and 650nm-laser, both "cross" and "star" images are recorded on the same place of the sample and readout. Cross-talk between two fulgide compounds in PMMA matrix is also investigated.

关键词： photochromic fulgide optical memory parallel recording crosstalk

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A brief history of high-power semiconductor lasers

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IEEE JOURNAL OF SELECTED TOPICS IN QUANTUM ELECTRONICS 2000年第6期6卷 1470-1477页

作者： Welch, DF SDL Inc San Jose CA 95134 USA

The following is a historical perspective of the significant technological demonstrations that shaped the history of high power semiconductor lasers, This article is not meant to be a re view article, as there are much better review articles and reviewers available, nor would the article try to cover all of the contributions to such a rich technology. Nonetheless, this article will, anecdotally, present a perspective on the technological advances that resulted in the enabling technology of high power semiconductor lasers for applications such as fiber optic communications, data storage, and material processing.

关键词： optical communications semiconductor lasers

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Rewritable volume holographic optical storage on PMMA film of diarylethene

Rewritable volume holographic optical storage on PMMA film o...

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Conference on advances in optical data storage technology

作者： Liu, XD Pu, SZ Zhao, FQ Luo, SJ Zhang, FS Tsing Hua Univ Dept Chem Minist Educ Key Lab Organ Optoelect & Mol Engn Beijing 100084 Peoples R China

ISBN: (纸本)0819455989

In this paper, diarylethene derivative, 1,2-bis(2-methyl-5-N,N-dimethylaminophenyl)-thien-3-yl) perfluorocyclopentene (BMDTP) was synthesized. And the PMMA film of 10 mu m thickness of BMDTP was fabricated by spin-coating method. The maximal UV-Visible absorption of amorphous PMMA film is 634nm. And the reflective index modulation(Delta n) is 2.14 X 10(-3) between the open- and close-rings form. On the PMMA film, ten gratings of hologram are recorded in one volume by angle multiplexing. Therefore, the diarylethene is a promising material for rewritable volume holographic optical storage.

关键词： photochromisrn diarylethene holograph

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Two-dimensional silicon-on-glass actuator combined with a dispensed polymer microlens

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MICRO & NANO LETTERS 2013年第10期8卷 606-608页

作者： Li, Pei Pan, Longfa Zappe, Hans Tsinghua Univ Dept Precis Instruments & Mechanol Beijing 100084 Peoples R China Univ Freiburg Dept Microsyst Engn IMTEK D-79106 Freiburg Germany

Actuators for objective lens positioning are indispensable components for writing and reading data to and from optical storage media. Significant advances in the technical capabilities of microlens actuators for optical heads have been achieved using MEMS technology, enabling miniaturisation and integration of optical data storage systems. In this reported work, a compact silicon-on-glass (SOG) actuator for two-dimensional (2D) positioning of a dispensed polymer microlens is developed by MEMS technology. A wafer-level process for fabrication of the SOG actuator is achieved using anodic bonding, in which a Pyrex wafer was bonded with an ultra-thin silicon wafer. Dispensed polymer microlenses are fabricated and subsequently integrated onto the 2D actuator by an automatic handling system. Typical displacements of about +/- 28.6 mu m in the tracking direction and 3.2 mu m in the focusing direction are experimentally characterised. The compact 2D SOG actuator and assembly technology may be particularly useful for expanding the application area for the optical head.

关键词： actuators bonding processes glass microactuators microlenses optical storage silicon two-dimensional silicon-on-glass actuator objective lens positioning writing data reading data optical storage media technical capability microlens actuators optical heads MEMS technology optical data storage systems compact silicon-on-glass actuator two-dimensional positioning wafer-level process anodic bonding pyrex wafer ultra-thin silicon wafer dispensed polymer microlenses 2D actuator automatic handling system typical displacements 2D SOG actuator assembly technology

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optical storage: technology and applications

Optical storage: Technology and applications

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Proceedings of the 1994 13th Symposium on Mass storage Systems

作者： Lenth, Wilfried IBM Almaden Research Cent San Jose United States

optical storage technology is characterized by the combination of high storage density, high data rate, fast access time, high reliability and media removability. The paper discusses innovations in component technologies that are leading to rapid advances in the optical storage technology. The appearance of improved storage management software will continue to extend the application potential of optical disk libraries beyond the more traditional backup and archival functions.

关键词： optical data storage

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The Theoretical consideration of the readout system for the photochromic optical disk

The Theoretical consideration of the readout system for the ...

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Conference on advances in optical data storage technology

作者： Wang, YY Jia, HB Xiong, JP Ma, C Jian, JQ Tsing Hua Univ Natl Engn Res Ctr Opt Memory Beijing 100084 Peoples R China

ISBN: (纸本)0819455989

The data are stored in the alternative pits and lands for present optical disk, which is similar to the grating. Accordingly, the grating theory becomes the basis theory for the optical disk. The work presented in this paper focused on several aspects of the following: outlining the optical disk models adopted by the theories in print, analyzing the foundation basis of the models, and bringing forward a model which can be used for the new-fashioned optical storage, multi-wavelength photochromic optical storage. The classical scalar diffraction theory supposed that the effects of the optical disk on the incident beam were introducing the local phase delay that could be described by the optical path difference Delta s, and the energy of the incident beam would not be absorbed. The two equations could respectively express the difference of the optical path: (1) Delta s = n* Delta h and (2) Delta s = Delta n*h. As the result of the analysis, we concluded that the tradition optical disk model fit for pit-land recording format and the cavity or bubble recording format. For the photochromic optical disk, the recording material, which absorbed the energy of the incident beam, was similar to the amplitude grating. The diffraction theory of this system was presented, and the equations for the readout signal were educed.

关键词： optical disk model scalar diffraction theory refractive index photochromic optical storage grating multi-wavelength transmittance coefficient

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Robust control in the three-dimensional optical pickup head for optical disk drive

Robust control in the three-dimensional optical pickup head ...

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Conference on advances in optical data storage technology

作者： Yen, JY Ouyang, KH Natl Taiwan Univ Dept Engn Mech Taipei 10617 Taiwan

ISBN: (纸本)0819455989

The servo control of the DVD optical head with tilt control is often difficult because of the coupled effect between the fine tracking servo and die tilt angle servo. Experiences show that the control system characteristics changes with different tilt angle. The controller may have to adapt for the characteristic change. This study presents a model to represent the changes in the system dynamics with respect to the different tilt angle. The variation in the dynamic behavior can than be lumped into a multiplicative system uncertainty. A mu-control synthesis procedure is then shown to be an effective servo design tool.

关键词： optical disk drive robust control uncertainty representation

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Recent advances on Neuromorphic Devices Based on Chalcogenide Phase-Change Materials

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ADVANCED FUNCTIONAL MATERIALS 2020年第50期30卷 2003419-2003419页

作者： Xu, Ming Mai, Xianliang Lin, Jun Zhang, Wei Li, Yi He, Yuhui Tong, Hao Hou, Xiang Zhou, Peng Miao, Xiangshui Huazhong Univ Sci & Technol Sch Opt & Elect Informat Wuhan Natl Lab Optoelect Wuhan 430074 Peoples R China Xi An Jiao Tong Univ Ctr Adv Mat Performance Nanoscale State Key Lab Mech Behav Mat Xian 710049 Peoples R China Fudan Univ Sch Microelect State Key Lab ASIC & Syst Shanghai 200433 Peoples R China

Traditional von Neumann computing architecture with separated computation and storage units has already impeded the data processing performance and energy efficiency, calling for emerging neuromorphic electronic and optical devices and systems which can mimic the human brain to shift this paradigm. Material-level innovation has become the key component to this revolution of information technology. Chalcogenide phase-change material (PCM) as a well-acknowledged data-storage medium is a promising candidate to tackle this challenge. In this review, the use of PCMs to implement artificial neurons and synapses from both the electronic and optical respects is discussed, and in particular, the structure-property physics and transition dynamics that enable such brain-inspired and in-memory computing applications are emphasized. Recent advances on the atomic-level amorphous and crystalline structures, transition mechanisms, materials optimization and design, neural and synaptic devices, brain-inspired chips, and computing systems, as well as the future opportunities of PCMs, are summarized and discussed.

关键词： artificial neurons artificial synapses memory neurocomputing phase change materials

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Test method for evaluating optical disk reliability

Test method for evaluating optical disk reliability

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Conference on advances in optical data storage technology

作者： Irie, M Okino, Y Kubo, T Osako Sangyo Univ Fac Engn Osaka 5748530 Japan

ISBN: (纸本)0819455989

This study examined a lifetime estimation method for optical disks. It is based on the Eyring acceleration model and statistical analysis. The statistical distribution of life data for the optical disk assumed a lognormal distribution. Analysis of statistical techniques based on the ISO standard is proposed as a life expectancy prediction method for CD-R disks. The standardized life expectancy of an optical disk is defined as the minimum lifetime of 95% survival probability at 25/50%RH with a 95% confidence level. An acceleration test was conducted using a high-density optical disk under stress conditions of temperature and relative humidity. Consequently, we confirmed the capability of this method for estimating life expectancy by considering the stresses of temperature and relative humidity, and providing for a confidence level. The statistical distribution function of optical disk lifetime data must be clarified experimentally to apply this technique to lifetime estimation of optical disks in the future.

关键词： optical disk life expectancy reliability Eyring acceleration model archival data

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