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Optical Data Storage Topical Meeting, 1997. ODS. Conference Digest

Date 7-9 April 1997

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  • 1997 Optical Data Storage Topical Meeting ODS Conference Digest [Front Matter and Table of Contents]

    Publication Year: 1997
    Request permission for commercial reuse | PDF file iconPDF (276 KB)
    Freely Available from IEEE
  • Long term outlook for magnetic and optical disk storage technologies

    Publication Year: 1997, Page(s):3 - 4
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (231 KB)

    Ten years ago, as rewritable optical disk products were first being introduced into the marketplace, it was common to compare magnetic and optical disk technologies in terms of their areal density metric, and to speculate about the demise of magnetic hard disk drives (HDDs) because ofthe superior densities of optical disk drives (ODDs). Now, in 1997, we can look back with a quite different perspec... View full abstract»

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  • Optical storage market outlook-what impact will the new technologies have?

    Publication Year: 1997, Page(s):5 - 6
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (161 KB)

    New technologies, commercialized in 97, will have a profound impact on the optical data storage market. CD-RW drives and media is the next step in CD technology impacting currently strong CD-R sales. The other new products are DVD-ROM drives. With over seven fold increase in capacity and data rate this format is the natural successor technology for CD-ROM. The delays in product introduction allowe... View full abstract»

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  • Patent and inventorship issues over the last thirty years of optical storage technology

    Publication Year: 1997, Page(s):7 - 8
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (188 KB)

    A pioneering invention yields first-of-a-kind technology with useful results. Once patented, the inventor is identified by name, Other persons, if any, named after the inventor, are fully credited with being co-inventors. In any case, credit for one's work is an intellectual asset, whether it is based on a legal document, which a patent is, or on a published paper in a technical journal. The idea ... View full abstract»

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  • CD-rewritable and future disc technology

    Publication Year: 1997, Page(s):9 - 10
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (134 KB)

    In the Optical Data Storage Conference in 1995, the basic concept of CD-Rewritable (CD-RW), which was formerly called CD-Erasable, and the disc technology with the Ag-In-Sb-Te phase change material was presented. In that paper, some important features that had been considered strongly desirable for a rewritable CD system were listed, and since then the solutions for these items have been standardi... View full abstract»

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  • DVD-RAM technology: first generation and future prospects

    Publication Year: 1997, Page(s):11 - 12
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (112 KB)

    At the end of last year, DVD-video players and DVD-ROM drives were put on the market as new optical memories for the multimedia era. Following these read-only DVDs, DVD-RAM is expected to be widely used for storing large amounts of information which will be sent to PCs and TVs through the Internet, CATV channels, satellites, etc. In this paper, we discuss first-generation and future DVD-RAM techno... View full abstract»

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  • High density phase-change recording beyond 2.6 GByte

    Publication Year: 1997
    Cited by:  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (28 KB)

    Summary form only given. We present recent progress in phase-change optical recording at 670 nm wavelength. Materials science aspects and recording technology will be discussed. View full abstract»

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  • LIMDOW-MSR MO disk memory

    Publication Year: 1997, Page(s):14 - 15
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (260 KB)

    Summary form only given. Light intensity modulation direct overwrite (LIMDOW) magneto optical disc memory with magnetically induced superresolution (MSR) is studied. LIMDOW-MSR added only one layer in a conventional LIMDOW and deposited by a production-machine is enough to support a linear density of 0.34 /spl mu/m/bit. View full abstract»

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  • Light intensity modulation direct overwrite MO disks with magnetically induced super resolution readout function

    Publication Year: 1997, Page(s):16 - 17
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (157 KB)

    We have previously proposed LIMDOW-MO (laser intensity modulation direct overwrite magneto-optical) disks with MSR (magnetically induced super resolution) by FAD (front aperture detection) system. In this study, we improve recording characteristics of LIMDOW-MSR disks using RAD (rear aperture detection) without any initializing magnet for the MSR layer. This enables high density recording as a res... View full abstract»

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  • Magnetic AMplifying Magneto-Optical System (MAMMOS) for ultra high density MO recording

    Publication Year: 1997, Page(s):18 - 19
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (189 KB)

    A readout method to amplify the MO signal by using a magnetic domain expansion phenomenon has been proposed and results shown. It was found that the small MO signal reproduced from the small recorded domain was amplified. This novel magnetic domain expansion read out technique shows high promise for future data storage technology. View full abstract»

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  • Independent readout from double recording layer MO using two wave length laser beams

    Publication Year: 1997, Page(s):20 - 21
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (153 KB)

    To achieve higher S/N on multi layer recording media, the multi wavelength readout system has been proposed. In this paper, the practical feasibility for independent readout from MO media having a double recording layer is confirmed using two wavelength laser beams. The layer structure of the media is substrate/SiN/TbFeCo/SiN/TbFeCo/PtCo/SiN. It has two TbFeCo recording layers which can store bina... View full abstract»

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  • Aluminum-wire grid polarizer for a compact magneto-optic pickup device

    Publication Year: 1997, Page(s):22 - 23
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (152 KB)

    A compact magneto-optic pickup device is required to realize magneto-optic disc systems of low cost and fast access. The key is a microminiaturized polarization component. We investigated the optimum fabrication conditions in the resonance domain for S-polarized light using electron-beam direct-writing and the liftoff method, and realized a low-loss wire-grid polarizer of Ts=80 % and Ts/Tp=30, and... View full abstract»

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  • High performance phase change media for DVD-RAM

    Publication Year: 1997, Page(s):27 - 29
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (266 KB)

    A rewritable digital versatile disk (DVD-RAM) has eight times more capacity than a CD-ROM disk, which makes it promising for use as a computer file memory device. Media compatibility is realized because a DVD-RAM uses the same write/read wavelength as the DVD-ROM, the same substrate thickness (the DVD-ROM disk uses a thin 0.6 mm-thick substrate so it can use a focusing lens with a large NA), and t... View full abstract»

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  • Analysis of DPD signal offset caused by optical asymmetry

    Publication Year: 1997, Page(s):30 - 31
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (159 KB)

    Differential Phase Detection (DPD) method is now widely used for tracking error generation in DVD players. DPD is known to be relatively immune to the optical asymmetry, but in reality DPD offset results from the lens shift or disc tilt. To achieve a stable tracking servo property, it is necessary to reduce this DPD offset. In this paper, we suggest a simple model to clearly show the causes of DPD... View full abstract»

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  • Edge detection in phase-change optical data storage

    Publication Year: 1997, Page(s):32 - 33
    Cited by:  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (221 KB)

    We introduce a new readout scheme, called edge detection scheme, for phase-change systems. A single split detector is used to detect the intensity of the reflected beam in the far field, and the readout signal, which relies on diffraction from mark boundaries, is the difference signal of the split-detector. We derive the magnitude of the readout signal for edge detection, clarify the effect of pha... View full abstract»

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  • Optimization of DVD media parameters

    Publication Year: 1997, Page(s):34 - 35
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (231 KB)

    DVD technology has established the importance of optimizing media for both the data signal and the tracking signal. The data signal from DVD-ROM is simply the integrated modulation on the quadrant photodetector, while the tracking signal is derived from the phase difference of the diagonal quadrant signals (differential phase detection or DPD). Closely related to the DPD signal is the quadrant pup... View full abstract»

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  • Sources of noise in phase-change disk data storage

    Publication Year: 1997, Page(s):36 - 37
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (250 KB)

    In optical disk data storage, it is essential to control the sources of noise in order to achieve high signal to noise ratio (SNR) and eventually a low byte error rate. There are several major types of noise in optical recording: thermal, shot, laser, media and writing noise. Here, we separate various noises for phase-change (PC) disks and analyze the media noise in some detail. It is shown that t... View full abstract»

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  • On exploiting channel code redundancy

    Publication Year: 1997, Page(s):38 - 39
    Cited by:  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (136 KB)

    This paper describes some channel coding schemes that are used in optical recording. The various trade-offs that are made, such as error propagation and efficiency, are discussed. The origin of the redundancy that is typically found in channel coding schemes, is described. An example is given of how this redundancy might be used to carry a volatile encryption key in a conventional channel coding s... View full abstract»

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  • Advanced channels for DVD with d=2 modulation coding

    Publication Year: 1997, Page(s):40 - 41
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (147 KB)

    Modulation codes with d>0 are essential in optical recording to enable useful densities, since the minimum mark size achievable is limited by the diffraction-limited spot size. The EFMPLus modulation code is a coding scheme adopted for the digital video disk (DVD). This is a run-length limited code with constraints d=2 and k=10. It is appropriate to exploit this knowledge of the coding scheme in t... View full abstract»

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  • Partial response recording in radial direction

    Publication Year: 1997, Page(s):42 - 43
    Cited by:  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (254 KB)

    Virtually all modulation methods developed for optical disk systems are designed in the same way as communication systems. Namely, the modulated output is always considered as a 1-D signal stream, even though the recorded signals on the disc form 2-D pit-patterns. We propose a novel recording method which utilizes the 2-D nature of optical disks. With this method, which we name RPR (Radial directi... View full abstract»

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  • Using pit-depth modulation to increase capacity and data transfer rate in optical discs

    Publication Year: 1997, Page(s):44 - 45
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (202 KB)

    Pit depth modulation (PDM), a technique in which an individual pit on an optical disc can take on one of multiple available depths, offers considerable improvement to disc capacity. We have used commercially-available mastering equipment and standard polycarbonate injection-molding techniques to manufacture compact discs of standard pitch but with individually varying pit depths. The pits have ide... View full abstract»

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  • Holographic data storage or reliability; a status report

    Publication Year: 1997, Page(s):46 - 47
    Cited by:  Papers (24)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (128 KB)

    Holographic data storage has the potential for high density data storage with fast optical access and very high data transfer rates. Recent progress in consumer electronics provides liquid crystal TVs as spatial light modulators (SLM) and CCDs from video camcorders with excellent performance at an interesting price point. This progress in the component area and recent development of improved recor... View full abstract»

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  • Holographic data storage with 100 bits//spl mu/m/sup 2/ density

    Publication Year: 1997, Page(s):48 - 49
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (183 KB)

    Holographic data storage offers several advantages when compared to conventional storage devices. As a benchmark, we compare holographic memory with optical compact discs. They are both removable, high capacity, and can be randomly accessed. The next generation compact disc due in early 1997, the Digital-Versatile-Disc (DVD), will have a capacity of /spl sim/6 Gbytes per layer, for a maximum plann... View full abstract»

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  • Compact lens-less holographic memory

    Publication Year: 1997, Page(s):50 - 51
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (165 KB)

    A common problem of many holographic memory systems is that they must occupy relatively large areas in order to accommodate the various imaging optics necessary for system operation. A typical memory system requires an imaging lens system between the input and output devices, such as a spatial light modulator (SLM) and charge-coupled device (CCD). The memory system we describe here integrates the ... View full abstract»

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  • Three-dimensional optical memory using photopolymer, photorefractive crystals, and photochromic materials

    Publication Year: 1997, Page(s):52 - 53
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (200 KB)

    Describes the systems and materials for three-dimensional optical data storage, which could exceed the classical limit in density of conventional optical data storage, gaining capacity/ density thirty times higher than that of a current compact disk. Experimental results demonstrate that with the proposed method at least thirty layers are successfully recorded and read in 300 /spl mu/m-thick photo... View full abstract»

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