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检索条件"任意字段=Conference on Photonic Devices and Algorithms for Computing V"

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Strain-induced lateral ordering and quantum effects in self-assembled GaInAs quantum wires

Strain-induced lateral ordering and quantum effects in self-...

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Indium Phosphide and Related Materials conference

作者： K.Y. Cheng D.E. Wohlert Department of Electrical and Computer Engineering and Microelectronics Laboratory University of Illinois Urbana-Champaign Urbana IL USA

ISBN: (纸本)0780367006

GaInAs quantum wire (QWR) structures have been fabricated using the strain-induced lateral-layer ordering (SILO) process during molecular beam epitaxy. The SILO process is a one-step completely in situ self-assembly method for creating QWRs. The resultant dense array of QWRs has a low defect density, small quantum-like dimensions, and demonstrate strong lateral confinement. More importantly, the band gap of GaInAs QWRs grown by the SILO process responds to temperature changes in ways that deviate from the norm for III-v semiconductors. This band gap behavior with respect to temperature of SILO grown GaInAs QWRs is both physically interesting and potentially applicable to optoelectronic devices.

关键词： photonic band gap Substrates Gallium arsenide Wires Temperature Diode lasers Indium phosphide Carrier confinement Quantum computing Molecular beam epitaxial growth

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Real-time disk scheduling for block-stripping I2O RAID

Real-time disk scheduling for block-stripping I2O RAID

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Euromicro conference on Real-Time Systems

作者： Tei-Wei Kuo Ji-Shin Rao v.C.S. Lee Jun Wu Department of Computer Science and Information Engineering National Taiwan University Taipei Taiwan Department of Computer Science and Information Engineering National Chung Cheng University Taiwan Department of Computer Science City University of Hong Kong Kowloon Hong Kong China

ISBN: (纸本)0769512216

The emergence of Intelligent I/O (I2O) architecture provides a standard for high-performance I/O subsystems and introduces intelligence at the hardware level. With an embedded processor, I2O adaptors can offload the major I/O processing workload from the CPU and, at the same time, increase the I/O performance. This paper addresses the essential issue in the design of disk scheduling for I2O RAID-0 devices. We explore online real-time multi-disk scheduling for I2O requests and propose highly efficient algorithms to minimize the number of deadline violations and, at the same time, to improve the response times of requests. The proposed methodologies are verified by a series of experiments under realistic and randomly generated workloads.

关键词： Processor scheduling Scheduling algorithm Computer science Delay Partitioning algorithms Computer architecture Hardware Traveling salesman problems Concurrent computing Costs

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Herd male genetic algorithm

Herd male genetic algorithm

引用

conference on photonic devices and algorithms for computing II

作者： Caulfield, HJ Phys Opt Corp Nashville TN 37208 USA

ISBN: (纸本)081943759X

There are two extremes in optimization with little ground between them. They are local optimization and global optimization. Local optimization is normally very fast, but the optimum it finds may be far from the best (global) optimum. Global optimization is very slow, but it gives the best optimum - at least in principle. Using mammal herds as rough models, we suggest a new evolutionary method that has aspects of both and achieves intermediate results most of the time: faster-than-global convergence with better-than-local performance.

关键词： Genetic algorithms Fourier transforms Optical filters Performance modeling algorithms Chemical elements Genetics Optimization (mathematics) photonic devices Stochastic processes

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Parallel computing systems using integrated optoelectronic devices

Parallel computing systems using integrated optoelectronic d...

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conference on photonic devices and algorithms for computing II

作者： Ishikawa, M Univ Tokyo Grad Sch Engn Dept Math Engn & Informat Phys Bunkyo Ku Tokyo 1138656 Japan

ISBN: (纸本)081943759X

Optical interconnections and integrated optoelectronic devices are expected to be promising candidates that solve the lack of interconnection bandwidth between large-scale integrated circuits (LSIs). However, although two-dimensional parallel devices such as vertical-cavity surface-emitting lasers (vCSELs) and spatial light modulators (SLMs) have massive parallelism, their capabilities are not fully utilized without appropriate way to yields high speed processing. From the viewpoint of system and algorithm, the improvement of the physical layer by optical technologies should require the reconsideration of the architectural design and algorithms so that enough performance improvements could be obtained. In this paper, we will present several of our optoelectronic parallel computing systems including a two-layer pipelined parallel system, which is called OCULAR-II. The system uses vCSELs and phase modulation SLM for realizing free-space reconfigurable optical interconnects. The algorithmic approach is discussed including the optimal load allocation for optically interconnected systems and a novel database management algorithm. As one of the most important technological challenges, the alignment problem of optical beam is also investigated.

关键词： parallel computing integrated optical devices optical interconnection vCSEL SLM

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Free-space optical interconnection modules for 2-D photonic-vLSI circuitry based on microlenses and GRINs.

Free-space optical interconnection modules for 2-D photonic-...

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conference on photonic devices and algorithms for computing II

作者： Baukens, v Cox, WR Guan, C Ottevaere, H Buczynski, R Goulet, A veretennicoff, I Thienpont, H Free Univ Brussels Dept Appl Phys & Photon B-1050 Brussels Belgium

ISBN: (纸本)081943759X

In this paper we present different configurations for a compact free-space optical interconnection (FSOI) module by combining two radial gradient refractive index lenses (GRIN) and/or two arrays of refractive microlenses. Based on our findings with ray-tracing and radiometric analysis we discuss how we have selected the proper optical system configurations and how we have chosen the different design parameters to optimally accommodate different types of opto-electronic emitters such as LEDs, micro-cavity LEDs and vCSELs. We hereby focused on maximizing optical coupling efficiencies and misalignment tolerances while minimizing inter-channel cross-talk Furthermore we discuss the experimental optical characteristics of two such prototype modules that we completed together with the first experimental results of their use in parallel data communication demonstrator systems.

关键词： free space digital optics optical interconnects photonic-vLSI GRIN lenses lens design refractive microlenses

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Low driving voltage electrooptic polymer modulators for advanced photonic applications

Low driving voltage electrooptic polymer modulators for adva...

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conference on photonic devices and algorithms for computing II

作者： Bechtel, JH Shi, YQ IPITEK Carlsbad CA 92008 USA

ISBN: (纸本)081943759X

The rapid development of ultra-wide bandwidth fiber optical communications networks has challenged circuit designers to obtain ever-increasing link gain-bandwidth products with new electro-optic modulators. As the link bandwidth increases, high power modulator drivers become very costly and have low efficiency. To overcome the limited gain-bandwidth product, it is important to reduce the required driving voltage or the so-called halfwave voltage of current electro-optic modulators. In this paper, we report results on new polymeric electro-optic modulators with a halfwave voltage of 0.8v and a halfwave voltage-interaction length product of 2.2v-cm. The low driving voltage allows electro-optic modulators to be driven directly by high-speed logic circuits without an amplifier. The driving electronics and the system cost can be significantly reduced when these modulators are implemented. Here, low halfwave voltage modulators are based on recent developments in materials and modulator fabrication technologies. The incorporation of a new second-order nonlinear optical chromophore CLD-1 in a poly(methylmethacrylate) matrix has a demonstrated electrooptic coefficient similar to 60 pm/v at 1318 nm wavelength. Using this material system and an optical push-pull modulator design, sub-1 volt Mach-Zehnder modulators were demonstrated with 3 cm interaction length. The material system, device fabrication, initial characterization, thermal and temporal stability of these modulators will be reported.

关键词： modulator optical communications fiber optics integrated optics electro-optics

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One-step trinary signed-digit arithmetic using an efficient encoding scheme

One-step trinary signed-digit arithmetic using an efficient ...

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conference on photonic devices and algorithms for computing II

作者： Salim, WY Fyath, RS Ali, SA Alam, MS Univ Basrah Coll Sci Dept Comp Sci Basrah Iraq

ISBN: (纸本)081943759X

The trinary signed-digit (TSD) number system is of interest for ultrafast optoelectronic computing systems since it permits parallel carry-free addition and borrow-free subtraction of two arbitrary length numbers in constant time. In this paper, a simple coding scheme is proposed to encode the decimal number directly into the TSD form. The coding scheme enables one to perform parallel one-step TSD arithmetic operation. The proposed coding scheme uses only a 5-combination coding table instead of the 625-combination table reported recently for recoded TSD arithmetic technique.

关键词： optoelectronic computing trinary signed-digit encoding carry-free addition borrow-free subtraction

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photonic time-stretching of 102 GHz millimeter waves using 1.55 μm polymer electro-optic modulator

Photonic time-stretching of 102 GHz millimeter waves using 1...

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conference on photonic devices and algorithms for computing II

作者： Fetterman, HR Chang, DH Erlig, H Oh, MC Zhang, C Steier, WH Dalton, LR Univ Calif Los Angeles Dept Elect Engn Los Angeles CA 90095 USA

ISBN: (纸本)081943759X

photonic time-stretch has been proposed as a signal preprocessor to perform A/D conversion in otherwise inaccessible high frequency regimes. We have demonstrated time-stretching of MM-wave signals at frequencies up to 102 GHz down to 11GHz, using an electrooptic modulator fabricated with the new polymer material PC-CLD. This application takes advantage of the inherent wideband capabilities of the PC-CLD material system, which has also demonstrated good optical insertion loss and high non-linearity at 1.55 mum. The dispersion penalty inherent to time-stretching imposes an additional bandwidth limit to that imposed by the modulator. A single-sideband modulator configuration is proposed to reduced the effect of this penalty.

关键词： photonic time-stretch polymer modulators electro-optic modulators PC-CLD A/D conversion

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Quotient-selected modified signed-digit division algorithm and its optoelectronic implementations

Quotient-selected modified signed-digit division algorithm a...

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conference on photonic devices and algorithms for computing II

作者： Qian, F Li, GQ Alam, MS Acad Sinica Shanghai Inst Opt & Fine Mech Shanghai 201800 Peoples R China

ISBN: (纸本)081943759X

A novel optoelectronic quotient-selected modified signed-digit division technique is proposed This division method generates one quotient digit per iteration involving only one shift operation, one quotient selection operation and one addition/subtraction operation. The quotient digit can be selected by observing three most significant digits of the partial remainder independent of the divisor. Two algorithms based on truth-table look-up and binary logic operations have been derived. For optoelectronic implementation, an efficient shared content-addressable memory based architecture as well as compact logic array processor based architecture with an electron-trapping device is proposed. Performance evaluation of the proposed optoelectronic quotient-selected division shows that it is faster than the previously reported convergence division approach. Finally, proof-of-principle experimental results are presented to verify the effectiveness of the proposed technique.

关键词： optical computing modified signed-digit quotient-selected division shared content-addressable memory electron-trapping device compact logic army processor

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Modelling of axially non-uniform photonic devices using finite-element base vectorial BPM

Modelling of axially non-uniform photonic devices using fini...

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3rd photonic Prague conference on photonics, devices, and Systems

作者： Rahman, BMA Obayya, SSA Puah, PA Katrisku, FA Grattan, KTv El-Mikati, HA City Univ London Dept Elect Elect & Informat Engn London EC1V 0HB England

ISBN: (纸本)0819436410

In this paper, numerical results of simulating various linear and nonlinear photonic devices using the finite element based- vector and scaler beam propagation methods are presented. The application of this newly-developed vector finite element based beam propagation method (vFEBPM) to problems involving radiation losses, like leaky-mode and bent optical waveguide devices is shown, and a study of a novel arrangement involving three-coupled cores working as a polarisation- insensitive optical filter is demonstrated. Also, scalar BPM algorithms based on finite elements have been developed and applied to nonlinear problems, like second harmonic generation (SHG) and soliton switching in nonlinear fibre couplers.

关键词： finite element modelling photonic device beam propagation method

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