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检索条件"任意字段=Conference on Advances in Optical Data Storage Technology"

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Materials and Performance Issues in the Practical Implementation of Vertical-Cavity Laserx

Materials and Performance Issues in the Practical Implementa...

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

作者： R.P. Schneider S.W. Corzine M.R.T. Tan K.H. Hahn S.G. Hummel Hewlett-Packard Labs Palo Alto Ca 94303

Vertical-cavity surface-emitting lasers (VCSELs) are rapidly nearing practical widespread implementation in key applications such as data communications. Because of numerous advantages relative to either edge-emitting lasers or light-emitting diodes, even broader application of this device technology is anticipated with further improvements in performance characteristics and wavelength coverage. In many cases, such advances hinge on advances in the underlying materials and process technology. This talk will overview the impact that different epitaxial design and process approaches, including selective oxidation, have had on improving VCSEL performance benchmarks over a broad wavelength range.

关键词： optical materials Vertical cavity surface emitting lasers Surface emitting lasers Apertures Light emitting diodes Fasteners optical design Process design Protons Gallium arsenide

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Homogeneous dephasing compensation in coherent transient optical memories and processors

Homogeneous dephasing compensation in coherent transient opt...

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conference on Lasers and Electro-Optics (CLEO)

作者： K.D. Merkel R. Babbitt Washington University in Saint Louis Saint Louis MO US Dept. of Electr. Eng. Washington Univ. Seattle WA USA

Summary form only given. Coherent transient optical memories and signal processors (CTOMs and CTOPs) take advantage of an inhomogeneously broadened absorber (IBA) to store and process temporal waveforms with data bandwidths exceeding 10 GHz and with extermely high storage and processing densities. In this paper, we propose and demonstrate techniques to compensate for the deleterious effects of dephasing in CTOMs and CTOPs. Compensation is achieved by applying an intensity ramp, which matches the inverse of the decay while maintaining roughly the same pulse area in the pattern stream to be recorded. We used the 783-nm transition of Tm/sup 3+/:YAG (0.1 at.%) at cryogenic temperatures to demonstrate the compensation techniques.

关键词： Optimized production technology optical sensors Bandwidth Pattern matching optical distortion Laser radar Signal processing Ultraviolet sources Cryogenics Temperature

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Parallel lithographic fabrication of micro-optical lenslets by photoexpansion in chalcogenide glasses

Parallel lithographic fabrication of micro-optical lenslets ...

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IEEE Photonics conference (IPC)

作者： S. Ramachandran D.J. Brady S.G. Bishop Center for Optoelectronic Science and Technology Department of Electrical and Computer Engineering University of Illinois Urbana IL USA

Chalcogenide glasses may be used to form refractive and relief structures for applications in integrated optics or optical data storage. Photodarkening and the attendant photo-expansion effect are the primary recording mechanisms in these materials. Photodarkening only a small region of the glass leads to stress at the interface between the darkened and unexposed regions due to volume differences between these two regions. This enhances the volume changes of the photoexpansion effect to fabricate surface relief gratings. This work focuses on using the large volume changes and the non-local nature of the photo-expansion effect to fabricate micro-lenses on the surface of As/sub 2/S/sub 3/ glasses. Previously reported lenslets were fabricated by irradiating samples with focused He-Ne laser light at 632.8 nm.

关键词： Glass optical refraction Integrated optics optical recording Photochromism optical device fabrication Memory optical materials Stress Gratings

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Electronic imaging for medical applications now and in the future

Electronic imaging for medical applications now and in the f...

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conference on Lasers and Electro-Optics (CLEO)

作者： B.R. Whiting S. Seshadri J.F. Owen Health Sci. Div. Eastman Kodak Co. Dallas TX USA

ISBN: (纸本)1557524432

Summary form only given. advances in modern healthcare have been enabled to a large extent by the application of diagnostic imaging, introduced just over a century ago. In the past several decades, the invention of new forms of electronic imaging have grown to be indispensable for current medical practice. However, new forces are now occurring that portend significant different directions for the future of electronics in medical imaging. Historically, the application of electronics to medical imaging has been a technology push, with research discovering new forms of information to detect, and products introduced and accepted by the marketplace with little question of efficacy or cost benefit. Because of society's reaction to the overall escalating cost of healthcare, there is now a reluctance to accept new electronic products without economic and clinical justification. Moreover, to date electronics has been primarily applied to the front of the "imaging chain", in new forms of image acquisition. With a wealth of imagery already in hand, market pull is beginning to direct the application of electronics to solve problems in other parts of the imaging chain, e.g. transmission, storage, display, and image management. The authors review the present state of electronic medical imaging and comment on future trends powered by the aforementioned forces.

关键词： Medical services Biomedical equipment Consumer electronics Biomedical imaging Costs Medical diagnostic imaging optical fiber sensors Power generation economics Image storage optical fiber devices

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An electro-optical modulator utilizing high-energy electrons in the free-space

An electro-optical modulator utilizing high-energy electrons...

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IEEE Photonics conference (IPC)

作者： R. Sabry S.K. Chaudhuri University of Waterloo

Gaining access to the ultrawide bandwidth of optical channels through a suitable electro-optical interface is an important issue for future optoelectronic technology. Considering the broad-bandwidth nature of relativistic free-electron generators of violet and ultraviolet radiation, it would be reasonable to devise a scheme based on the same principles for electro-optical interfacing in the near infrared and even soft X-ray regime. Realisation of such a device does not seem to be unrealistic considering the growing advances in electron-beam injection and microsystems technology. For optoelectronic applications, such as those for very-high bit-rate data communication, the device must be compatible to an existing system. Therefore, the interaction design in a small and economic size has to be considered. On this basis, we initiated a search for a device by looking for potential schemes which take advantage of relativistic electrons and electromagnetic field interaction. We previously adopted a characteristic interaction model with small dimensions and studied the electronic to optical transition/modulation process. The operating characteristics, e.g., coupled wavelengths and gain, associated with the electro-optical coupling process were derived in terms of model parameters and the challenges were defined accordingly. As a continuation of this work, here we explore an interaction design based on the use of cyclotron relativistic electrons. One important advantage of this scheme is that electrons can be easily re-used for another interaction cycle. Another advantage is that for the same physical dimensions, this design offers a longer interaction length which results in gain and power enhancement.

关键词： Electrooptic modulators optical modulation Electron beams Bandwidth Electron optics Electromagnetic fields optical coupling Magnetic fields Undulators optical polarization

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Design of a parallel photonic FFT processor

Design of a parallel photonic FFT processor

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International conference on Massively Parallel Processing Using optical Interconnections

作者： R.G. Rozier F.E. Kiamilev A.V. Krishnamoorthy UNC-Charlotte Charlotte NC USA Bell Labs Lucent Technologies Inc. Holmdel NJ USA

We present the design of a parallel high-performance chipset for computing 1-D complex fast Fourier transforms (FFTs). The chipset is composed of two chips-a photonic FFT processing engine (PFFT) and a photonic data storage element (PRAM). Using this chipset, a number of high-speed systems can be created. The chipset is compatible with a number of available interconnect technologies, such as free-space optical interconnection schemes involving the flip-chip integration of submicron CMOS ICs with GaAs chips containing 2-D arrays of multiple quantum well diode optical receivers and transmitters.

关键词： optical arrays Concurrent computing Fast Fourier transforms Flexible printed circuits Engines Phase change random access memory CMOS technology optical interconnections Gallium arsenide Diodes

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Evaluation of solar radiation energy as a first-hand option in the preliminary evaluation of PV pumping systems

Evaluation of solar radiation energy as a first-hand option ...

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conference Record of the Twenty Fifth IEEE Photovoltaic Specialists conference - 1996

作者： N. Argaw Tampere University of Technology Tampere Finland

Daily average global solar radiation data of Addis Ababa, Ethiopia, station from year 1970-1994 was taken in the evaluation. The percentage ratio of the solar radiation energy below 3 kWh/m/sup 2//d based on the number of consecutive days, and the probability density and the cumulative frequency distribution of the solar radiation energy were calculated for each month. The evaluation shows that the cost of PV systems can be reduced by carefully evaluating the consecutive bad solar radiation days and the daily water balance. The consecutive negative water balance values are summed, and the lowest value from the series of values is the worst consecutive bad solar radiation days. This lowest value is exactly the amount of the extra water required to fulfil the water demand, and is equal to the size of the water tank. This is the optimum tank size that makes the PV system operating at full capacity.

关键词： Solar radiation Batteries Costs Rain Probability Frequency Water storage Energy storage Cows optical arrays

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A high resolution marine particle analysis system

A high resolution marine particle analysis system

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OCEANS

作者： T.T. Sutton T.L. Hopkins L.C. Langebrake Department of Marine Science University of South Florida Saint Petersburg FL USA Center for Ocean Technology University of South Florida Saint Petersburg FL USA

Suspended particulate matter is a primary variable with respect to biological and physical processes in the marine environment. The authors have developed an integrated towed instrument platform system to analyze as broad a spectrum of particulate sizes as possible using state-of-the-art technology to address basic oceanographic, environmental and military issues. The High Resolution Sampler (HRS) system uses several technologies to address different size classes of the marine particle spectrum. The 50 /spl mu/ to 2 cm (spherical diameter, SD) size classes are quantified using optical Plankton Counters (OPC, Focal Technologies, Inc.), employed alone or in tandem. The 50 /spl mu/ and greater size classes are also quantified using a non-intrusive laser light sheet/video system as well as a collimated dual light sheet system under development. As an alternative to optical systems, the authors are developing a multiple frequency, miniaturized forward-looking "chirp" sonar for ensonifying a parcel of water directly ahead of the light sheet (see Remsen et al., this volume). All data are collected in situ and transferred to deck for real-time display and storage. Verification systems include a plankton cod-end (50-162 /spl mu/ mesh) carousel (20 positions) net system for collecting particles which have passed through the optical sensors. The integrated optical-electronic sensor package is mounted on a towed vehicle which has been sea tested over several years in the Gulf of Mexico and Weddell Sea.

关键词： optical sensors Marine technology Biomedical optical imaging Marine vegetation Instruments Counting circuits optical collimators Frequency Sonar Displays

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Text segmentation for automatic document processing

Text segmentation for automatic document processing

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International conference on Emerging Technologies and Factory Automation (ETFA)

作者： D.P. Mital Goh Wee Leng School of Electrical & Electronic Engineering Nanyang Technological University Singapore

There is a considerable interest in designing automatic systems that can scan a given paper document and store it on electronic media for easier storage, manipulation and access. Most documents contain graphics and images, in addition to text. Thus, the document image has to be segmented to identify text and image regions, so that appropriate techniques may be applied to those regions. In this paper, we have presented a new technique for image segmentation in which text and image regions, in a given document image, are automatically identified. Technique is based on differential-processing text extraction concept. The proposed technique is capable of analysing complex document image layouts. Document image is processed by using textural feature analysis. Results of the proposed method are presented with test images which demonstrate the robustness of the technique.

关键词： Image segmentation optical character recognition software Graphics storage automation data mining Image analysis Technical drawing Image converters Design engineering Paper technology

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Interactive on-line manufacturing and repair system (io-MARS)

Interactive on-line manufacturing and repair system (io-MARS...

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International Automatic Testing conference, AUTOTESTCON

作者： H.H. Scott Crane Division Naval Surface Warfare Center Crane IN USA

The conceptualization of a new manufacturing and repair system began in 199l. This paper explains how the system of 1991 evolved into the system of 1996. The original system proposed consolidating diverse activities into a single, modern facility, built especially for the repair of electronic modules. Management's role was to coordinate all activities from a central point and repair technicians would be given the tools to communicate with all relevant systems. Only a portion of the similar activities have been consolidated into one building. Management decided that oversight, not control, was a goal that all systems did not need to be fully integrated. The original concept envisioned mainframes for central control. LANs, cable, and fiber optics were the connecting links for workstations and other systems. Technicians would enter data, support systems would supply technical and managerial information and databases would accumulate data and produce information. Support systems would schedule work and deliver items to the work areas, as required, without human intervention. Personnel would be free to devote their time to value added tasks. As the system developed, management realized that people needed stress relief and social contact. People needed to leave their work area for breaks; therefore, they created reasons to leave their work area, such as manually scheduling workload or going to the storage location to query the operator about a specific part and then hand carry that part back to the workbench. Full integration of support systems with io-MARs is coming with Internet and Netscape, a new technology not envisioned in the original plans. End item tracking, automated storage and retrieval recording of repair processes; and some integration to outside systems have been completed. But automated material stocking and ordering, production control, test processing, videogenics, certification of processes and people, and failure analysis are enhancements we are still

关键词： Manufacturing Job shop scheduling Control systems Centralized control optical fiber cables optical fibers Joining processes Workstations Information management databases

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