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optical data storage

作者： T. Kondo A. Hayami T. Oki J. Tonami E. Nakagawa T. Kojima M. Itonaga Technology Development Division Victor Company of Japan Limited Yokosuka Kanagawa Japan

The performance of the proposed system with the noise reduced ROM optical storage disc and the error feedback (EF)-partial response maximum likelihood (PRML), composed of the error-select type adaptive equalizer and the adaptive Viterbi decoder, is demonstrated. The reproduced signal of the 19.8 GBytes ROM disc shows a sufficient low error characteristic.

关键词： Read only memory Lenses Diode lasers Decoding Adaptive equalizers Viterbi algorithm optical signal processing Adaptive optics optical modulation optical noise

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Blue phase change recording at high data densities and data rates

Blue phase change recording at high data densities and data ...

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optical data storage

作者： M.J. Dekker N. Pfeffera M. Kuijpera B. Tieke I.P.D. Ubbens W.M.J. Coene Philips Research Eindhoven Netherlands Philips Research Eindhoven North Brabant NL Philips Optical Disc Technology Center Eindhoven Netherlands

We have shown that fast growth determined materials (FGM) can be used in high density (land-groove) high data rate phase change recording. We applied these materials to the DVR-blue system and developed discs with a total capacity of 22 GB at a user data rate of 51 Mbps. Thermal management of the stacks on these discs, especially by the use of thin metal layers, is an important ingredient.

关键词： optical recording Diode lasers Disk recording Maximum likelihood detection Jitter Roads Apertures Lenses optical materials optical crosstalk

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The fabrication and characterization of nano-aperture VCSEL array head for high density near-field optical data storage

The fabrication and characterization of nano-aperture VCSEL ...

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optical data storage

作者： Young-Joo Kim K. Kurihara K. Suzuki A. Yamaguchi K. Goto Department of Information and Comunication Technology Tokai University Numazu Shizuoka Japan

A 2D nano-aperture VCSEL array head of near-field optics was studied with the formation of small aperture on the VCSEL surface after the deposition of dielectric and metal films. Its optical properties were also characterized to apply the VCSEL array for the near-field optical memory system of higher data capacity and speed. In this study, we could produce very small aperture of around 50 nm in diameter successfully using a focused ion beam (FIB) method, and get the reasonable increasement in the laser power with the formation of nano-aperture on each VCSEL emitting surface.

关键词： Vertical cavity surface emitting lasers optical arrays optical films Apertures Particle beam optics Surface emitting lasers optical device fabrication Dielectric films Stimulated emission Ion beams

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Micro solid immersion lens fabricated by micro-molding for near-field optical data storage

Micro solid immersion lens fabricated by micro-molding for n...

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IEEE/LEOS International conference on optical MEMS

作者： Youngjoo Yee Jong Uk Bu Il-Joo Cho Euisik Yoon Su-Dong Moon Shinill Kang Devices and Materials Laboratory LG Electronics Institute of Technology Seoul South Korea Department EECS Korea Advanced Institute of Science and Technology Taejon South Korea Center for Information Storage Device Yonsei University Seoul South Korea

optical near-field techniques have shown some promise for high-density optical data storage of several tens Gb/in/sup 2/. The diffraction limit of the far-field optics can be greatly relaxed by solid immersion lens (SIL). Recent research on near-field optical recording is focusing on a commercial product: the high-density storage drive. It is attractive to minimize the size and the weight of the SIL to realize a near-field optical pickup head capable of fast tracking and of maintaining a stable gap in the optical near-field regime. A simple and reliable micromachining process is developed to make miniaturized SIL. Polymeric super-hemispherical SIL can be replicated by hot press molding using the micromachined silicon master. The design and fabrication issues of the micromachined silicon master and molding process of the SIL are reported. The magnification factor of the fabricated micro-SIL is 3.143.

关键词： Solids Lenses optical recording optical polymers Silicon Memory optical diffraction Magnetic heads Maintenance Micromachining

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Holographic digital storage with sensitive and flexible photo-initiated polymerization recording

Holographic digital storage with sensitive and flexible phot...

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conference on Lasers and Electro-Optics (CLEO)

作者： L. Paraschis Y. Sugiyama S. Orlov L. Hesselink Electrical Engineering Department University of Stanford Stanford CA USA

ISBN: (纸本)1557526346

Summary form only *** holographic recording of information is an attractive solution for the next generation of digital storage, holding promise for systems with high density (/spl ges/10 Gbit/cm/sup 2/), and fast transfer rate (Gbit/sec). The performance of a holographic storage system is principally determined by the recording medium characteristics. Photorefractive crystals had been the most extensively investigated volumetric media, offering good optical quality, and sensitive, but typically volatile, recording. Recently, advances in sufficiently thick photopolymerizable recording media have provided a very attractive alternative for WORM systems. This work evaluates the recording physical properties of photopolymer holographic storage.

关键词： Holography Polymers Digital recording optical recording Holographic optical components Gratings Optimized production technology Graphics Crops optical distortion

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Two-photon three-dimensional bit optical data storage in photorefractive polymers

Two-photon three-dimensional bit optical data storage in pho...

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conference on Lasers and Electro-Optics (CLEO)

作者： M. Gu D. Day A. Smallridge Optoelectronic Imaging Group School of Communications and Informatics Vienna University of Technology VIC Australia

ISBN: (纸本)1557526346

Summary form only given. Recently, we have reported on the three-dimensional (3D) optical bit data storage in photorefractive polymers using two-photon excitation, which allows one to develop a low-cost, erasable, and rewritable 3D optical storage method. The photorefractive polymer we used consists of 2,5-dimethyl-4-(p-nitrophenylazo)anisole, 2,4,7-trinitro-9-fluorenone, 9-ethylcarbazole and poly(N-vinylcarbazole).

关键词： optical polymers Memory Photorefractive effect Image storage Holography Holographic optical components Power lasers Material storage optical crosstalk optical imaging

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All-optical data rate conversion using coherent transient interactions

All-optical data rate conversion using coherent transient in...

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conference on Lasers and Electro-Optics Europe (CLEO EUROPE)

作者： R. Krishna Mohan M. Afzelius X. Wang N. Ohlsson S. Kroll Department of Physics Lund Institute of Technology Lund Sweden

ISBN: (纸本)0780363191

Summary form only given. Using photon echo processes a range of all-optical signal processing operations can be performed in inhomogeneously broadened materials. For example, all-optical devices for communication, such as optical bit-rate converters and routers and optical data storage devices and erasable memories with storage densities in the range of terabits/cm/sup 2/ have been proposed based on photon echo processes in rare-earth-ion-doped crystals.

关键词： Photonic crystal fibers Semiconductor optical amplifiers Photonic crystals optical fibers High speed optical techniques Stimulated emission optical signal processing optical devices optical receivers Ultrafast optics

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Sensor development: progress towards systems for AUVs/UUVs MTS Oceans 2000

Sensor development: progress towards systems for AUVs/UUVs M...

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OCEANS

作者： L.C. Langebrake S.A. Samson E.A. Kaltenbacher E.T. Steimle J.T. Patten C.E. Lemble R.H. Byrne K. Carder Center for Ocean Technology Department of Marine Science University of South Florida Saint Petersburg FL USA University of South Florida Tampa FL US Department of Marine Science University of South Florida Saint Petersburg FL USA

The oceanographic community is seeing new and substantial advances in the development of underwater vehicles. The future is near when we will witness networked fleets that will acquire synoptic data over wide areas. The potential of multiple, concurrent AUV/UUV deployments promises the ocean research community with increased data accuracy, the elimination of spatial and temporal aliasing, and more efficient and cost-effective means of data dissemination. To complement these advances in AUV/UUV technology, we will need continued development of new and more sophisticated sensor systems, to expand our understanding of the ocean's processes. The University of South Florida's Center for Ocean technology specializes in developing sensor systems to meet the ever-increasing need of oceanographers to collect high-resolution data relating to the chemical, biological and physical processes of the ocean. This paper presents up-to-date information about three of those instruments.

关键词： Sensor systems Oceans Instruments optical refraction optical filters optical mixing optical pumping optical sensors Chemical sensors Sea measurements

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High density optical disc readout using a blue laser diode and a transparent plastic substrate with 0.3 mm thickness

High density optical disc readout using a blue laser diode a...

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optical data storage

作者： Kyung-Chan Park Hyung-Nam Kim Seong-Yun Jeong Seong-Keun Ahn Taek-Soo Lee Jin-Yong Kim Jun-Seek Lee Ji-Byung Kim Seong-Won Lee Dong-Cheol Lee Digital Media Laboratory LG Electronics Inc. Seoul South Korea LG Corporate Institute of Technology Seoul South Korea

ISBN: (纸本)078035950X

We have shown that a 15 GB optical disc that has a transparent plastic substrate of 0.3 mm thickness can be reproducible with an objective lens of NA 0.65, without any tilt servo and crosstalk cancel. And we also confirmed that the injection pressing molding method may be feasible to produce a plastic substrate of 0.3 mm thickness.

关键词： Diode lasers Plastics Substrates optical crosstalk optical films Testing DVD Structural discs optical polymers Jitter

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PZT actuated micromirror for nano-tracking of laser beam for high-density optical data storage

Proceedings of the IEEE Micro Electro Mechanical Systems (ME...

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Proceedings of the IEEE Micro Electro Mechanical Systems (MEMS) 2000年 435-440页

作者： Yee, Youngjoo Nam, Hyo-Jin Lee, See-Hyung Bu, Jong Uk Jeon, Young-Sam Cho, Seong-Moon LG Corporate Inst of Technology Seoul Korea Republic of

A micromirror actuated by piezoelectric cantilevers is proposed as a fine-tracking device for high-density optical data storage. Metal/PZT/metal thin film actuators translate an integrated micromirror along the out-of-plane vertical direction. The parallel motion of the micromirror steers linearly the optical path of the reflected laser beam. Numerical analysis shows that the actuated micromirror can satisfy the tracking speed imposed by the requirement on the access time for the high-density optical data storage up to few tens Gbit/in2. In this paper, preliminary characteristics of the micromachined PZT actuated micromirror (PAM) are reported. The design and the fabrication process of the PZT actuated micromirror are described. Only a 3600 angstroms-thick PZT film deposited by sol-gel process shows both good electrical and mechanical characteristics for the actuators. The micromirror can be easily actuated up to several micrometers under low voltage operation condition.

关键词： Microelectromechanical devices

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