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conference on advances in optical data storage technology

作者： Pu, SZ Xu, JK Shen, L Xiao, Q Liu, G Xiao, WH Zhang, FS Jiangxi Sci & Technol Normal Univ Jiangxi Key Lab Organ Chem Nanchang 330013 Peoples R China

ISBN: (纸本)0819455989

Four novel photochromic dithienylethenes compounds, 1,2-bis[2-methyl-5(p-fluorophenyl)-3-thienyl]perfluorocyclo-pentene (1a), 1, 2-bis[2-methyl-5(p-ethox yphenyl)-3-thienyl]perfluorocyclopentene (2a), 1,2-bis[2-methyl-5(p-N,N-dimethylaminophenyl)- 3 -thienyl]perfluorocyclopentene (3a) and 1,2-bis(2-methyl-5-naphthalene-3-thienyl)perfluorocyclopentene (4a) were synthesized. Their optoelectronic properties, such as photochromism in solution as well as in PMMA amorphous, fluorescence and electrochemistry properties were systematically investigated. These dithienylethenes have shown good photochromic behavior both in solution and in PMMA amorphous film. All of them exhibited relatively strong fluorescence. With the increase of their concentration in a THF solution, their fluorescence spectra showed a bathochromic shift. The irreversible anodic oxidation of la, 3a and 4a occurred when performing cyclic voltammetry tests. Moreover, dithienylethene la showed remarkable multi-color electrochromic properties during the anodic polarization. In addition, photo-mode multi-step optical storage using 2a and 3a as recording medium was performed successfully.

关键词： dithienylethene photochromism fluorescence electrochemistry multi-step optical storage

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Multiplexing holograms in the photopolymer with equal diffraction efficiency

Multiplexing holograms in the photopolymer with equal diffra...

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conference on advances in optical data storage technology

作者： Yan, AQ Tao, SQ Wang, DY Shi, MQ Wu, FP Beijing Univ Technol Coll Appl Sci Beijing 100022 Peoples R China

ISBN: (纸本)0819455989

Photopolymer is an optimum material for practical holographic storage because of low cost and good characteristics. A new epoxy resin-photopolymer is reported. Polymeric binder is epoxy resin whose refractive index is high, but the monomer's refractive index is relatively low. The design can make monomer transfer freely in rigid frame, so we can realize no-shrinking recording and stabilize the recorded hologram. Simple grating is recorded in films, then we obtained the relationship curve between the exposure energy and diffraction efficiency by sending a single beam into the photopolymer film. According to the exposure curve, there is a recording delay, so the pre-exposure is needed to sensitize the material. In order to avoid cross-talk between contiguous holograms, angle selectivity of the material is measured. Then we investigate how diffraction efficiency is distributed in all multiplexed holograms with equal-time exposure. One method of calculating exposure schedule for multiplexing holograms in photopolymer with equal efficiency is presented. By using such exposure schedule, holograms are recorded at a single location by angle multiplexing, and the uniformity of their diffraction efficiency is remarkably improved. After iterating the procedure, it is possible to achieve much more uniform diffraction efficiency.

关键词： photopolymer volume holography holographic storage exposure schedule diffraction efficiency

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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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Lyteloop data "storage in Motion"

Lyteloop Data "Storage in Motion"

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conference on Industrial optical Devices and Systems (ODS) as part of the SPIE Optics + Photonics conference

作者： McManamon, P. F. Vedadi, A. Willner, A. Choudhary, D. Harlev, O. Lyteloop 80 Cuttermill RdSuite 309 Great Neck NY 11021 USA Exciting Technol LLC Dayton OH 45424 USA USC Los Angeles CA USA

ISBN: (数字)9781510629448

ISBN: (纸本)9781510629448

This paper presents a patent pending approach to store digital data using high bandwidth laser light in motion. data is stored in a loop. The amount of data stored is the data rate times the storage time. Lyteloop uses: (i) highly multiplexed optical communications to maximize data rate, and (ii) a long light path, to maximize length of time it takes light to traverse the full storage loop. Lyteloop is developing data storage in motion in 4 domains : fiber, space, and two forms of near vacuum chambers. Multiplexing is done across very wide wavelength ranges, and many spatial modes. OEM modes will be used in free space at the shorter wavelengths, and other spatial mode structures will be used in fibers. Multiple cores will be used in fibers. A 1.5 Gigabyte demonstation data storage unit has been built in fiber, and is described, along with its performance. We are starting a free space prototype. Lyteloop builds on, and advances, both free space, and fiber, high data rate communications technology as a method of storing data in motion. We also have patent pending approaches to increase the length of the data stroage loop. Less complex, and lower power, signal regeneration will be required to achive Lytelops's goals.

关键词： data storage data transfer rates Vacuum chambers Fiber digital data

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Finite-Element Shock Analysis of Slim optical Disk Drives

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IEEE TRANSACTIONS ON MAGNETICS 2009年第5期45卷 2213-2216页

作者： Lim, Seungho Kim, Kyungtae Choi, Chanho Park, No-Cheol Park, Young-Pil Park, Kyoung-Su Cha, Ik-Joo Yonsei Univ Dept Mech Engn Seoul 120749 South Korea Hitachi LG Data Storage Inc Pyeongtaek Si 451713 Gyeonggi Do South Korea

In this paper, a finite-element model of a slim optical disk drive is developed to investigate the transient response of the sled base and disk. The model is simplified by using beam, shell and lumped parameter elements, in order to decrease the computational time. After the dynamic characteristics of the finite-element model have been verified by modal test, the shock response is obtained and compared with the results of a drop test. Finally, dynamic characteristics are modified to improve the shock performance.

关键词： Finite-element method linear drop test shock analysis slim optical disk drive

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Ferrofluids for optical pick-up actuators as a heat transfer material

Ferrofluids for optical pick-up actuators as a heat transfer...

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conference on advances in optical data storage technology

作者： Tsuda, S Hirota, Y Uzawa, E Kaneko, R Ferrotec Corp Chiba 2892131 Japan

ISBN: (纸本)0819455989

Rotational speed of optical drives and servo speed of optical pick-up actuators should be higher to meet high performance for optical drives. One of the methods to achieve such a high performance product is to increase an input power for the coil, but a heat problem generated by the coil will become serious. Two kinds of new ferrofluids have been designed to transfer a heat from the coil of optical pick-up actuator. Their physical properties have been properly designed to be functioned at a wide operating temp. and various aspects of their reliability including resistance for deterioration to high temp. and humidity, etc., have been evaluated. Also, they have been applied to optical pick-up actuators and the properties of ferrofluids such as heat transfer and shock resistance have been examined. The life tests showed that the new ferrofluids had at least two times longer life and a smaller viscosity change than CF-3A, which has been used in commercially available optical pick-up actuators. The new ferrofluids could tolerate the shock of 500 G without a ferrofluid splash, the coil temp. with the ferrofluid was about 10 degrees C or more lower than the one without it at the same input power.

关键词： ferrofluid heat transfer damping optical pick-up actuator servo speed

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A general purpose development kit for optical storage system design

A general purpose development kit for optical storage system...

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conference on advances in optical data storage technology

作者： Chen, CH Yen, JY Huang, CY Lo, FH Natl Taiwan Univ Dept Engn Mech Taipei 10617 Taiwan

ISBN: (纸本)0819455989

optical Disk Drives (ODD) uses chipsets to implement the various functions required in its operation. The chipsets always have fixed algorithm that make it impossible for the researches to carry out any experiments on newly developed algorithms. To overcome this difficulty, this study has constructed a test platform for the ODD experiments. This platform solution allows for software implementation of all the necessary functions in the CD/DVD system. The researchers can easily alter the software to change the existing functions of to implement new functions for different applications. The hardware of this development system is mainly composed of MSC-51, FPGA, DSK, AD/DA module, and an analog mother board. The MSC-51 is responsible for applying commands and setting functions, and it plays a role of master in the system. The TI DSK 6711, served as a slave, is responsible for implementing new algorithms and focus is mostly focused on servo control. The FPGA is responsible for handshaking among the DSK, the MSC-51, and the AD/DA module board;it also provides the register banks for the MSC-51 and the DSK. The purpose of the AD/DA module board is to establish communication link to the physical world. There are two A/D chips of eight channels and four D/A chips of four channels on the AD/DA module board. There are also a pre-amp chip and a driver on the analog mother board to amplify the signal on the ODD and to drive a DC motor. Users only have to change the pre-amp and ODD for different type of ODD.

关键词： optical disk drive non PC-based

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Performance Evaluation of Iterative Channel Codes for Digital data storage on Microfilm

Performance Evaluation of Iterative Channel Codes for Digita...

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IEEE Global Telecommunications conference (GLOBECOM 2010)

作者： Pflug, Florian Voges, Christoph Fingscheidt, Tim Tech Univ Carolo Wilhelmina Braunschweig Inst Commun Technol D-38106 Braunschweig Germany

ISBN: (纸本)9781424456383

In the past few years microfilm has gained new research interest as a medium for long-term storage of digital data. This became particularly possible by recent advances in laser film recording technology. In contrast to other optical or magnetic storage media, the microfilm digital channel (MDC) still has been subject to characterization in only a few publications. In this paper we investigate iterative channel codes for the MDC, in particular low-density parity-check and turbo convolutional codes. Simulation results show that practically error-free storage can be achieved with code rates even above 0.85 on a monochrome MDC with binary amplitude-shift keying modulation.

关键词： amplitude shift keying binary amplitude-shift keying modulation binary codes convolutional codes digital data storage iterative channel codes iterative decoding laser film recording low density parity check code magnetic storage magnetic storage media mic

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GZIP Hardware Compression in Networking and storage Applications

GZIP Hardware Compression in Networking and Storage Applicat...

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International Multi-conference on Engineering and Technological Innovation

作者： Summers, Tony Comtech AHA Corp Moscow ID 83843 USA

ISBN: (纸本)9781934272527

Transferring data packets over a network is more efficient when lossless data compression is applied before transmitting. Storing that same data requires less space if compression is applied prior to writing the data to the storage media. Higher data rates and rapidly expanding storage requirements drive the need for better compression solutions. Power conservation strategies also play an important role today in developing data management systems. technology advances are enabling products to meet these developing and growing needs.

关键词： Digital storage

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Digital data storage and encryption using a phase-coded holographic memory system

Digital data storage and encryption using a phase-coded holo...

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advances in Photorefractive Materials, Effects and Devices, APMED 1999

作者： Denz, Cornelia Miiller, Kai-Oliver Visinka, Franz Tschudi, Theo Institute of Applied Physics Darmstadt University of Technology Hochschulstr. 6 DarmstadtD-64289 Germany

ISBN: (纸本)1557526060

We present the experimental realization of a compact and fully automized volume holographic memory based on phase-coded multiplexing that is capable of both, high-resolution analog image and digital data storage, having a storage capacity of up to 480 data pages in a single interaction region of a photorefractive LiNb03 crystal. The system architecture, its implementation, and its performance are described, with emphasize on the realization of digital data storage. Moreover, the possibility of data encryption using a supplementary random phase modulation of the reference beam is investigated. OCIS codes: (210.0210) optical data storage;(210.4680) optical memories;(210.2860) holographic and volume memories;(090.7330) volume holographic gratings;(160.5320) photorefractive material;(160.3730) Lithium Niobate;(999.999) data encryption. © 1999 optical Society of America.

关键词： Niobium compounds

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