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

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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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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...

引用

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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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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High aspect ratio submicron microstructures in LiNbO₃:: fabrication and potential applications to photonic devices

High aspect ratio submicron microstructures in LiNbO<sub>3</...

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conference on photonic devices and algorithms for computing

作者： Yin, SZ Penn State Univ Dept Elect Engn University Pk PA 16802 USA

ISBN: (纸本)0819432911

Fabrication of high aspect ratio submicron to nanometer range micro structures in LiNbO3 using a state of the art Schlumberger AMS 3000 focused ion beam (FIB) system is presented. The submicron structures with about 350 nm width and 1600 nm depth are fabricated by employing XeF2 gas assisted Gallium ion beam etching with 50 pA of ion beam current. A variety of opto-electronic devices such as micro sensors, directional couplers, extremely compact electro-optic modulators and wavelength filters could be built based on this type of high aspect ratio submicron structures in LiNbO3, which may lead to the next generation of integrated opto-electronic devices that have higher levels of device integration and enhanced functionality.

关键词： lithium niobate focused ion beam etching photonic devices microstructures MEMs

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Crystal substrate integration of free-space optical computing systems

Crystal substrate integration of free-space optical computin...

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conference on photonic devices and algorithms for computing

作者： Liu, LR Zhou, CH Yin, YZ Guo, YC Li, JL Wang, HS Liu, YW Yan, XN Liu, B Xu, LY Li, Y Acad Sinica Shanghai Inst Opt & Fine Mech Shanghai 201800 Peoples R China

ISBN: (纸本)0819432911

This paper summarized our developments on the integration of miniaturized optical 3-D systems using crystal substrates, which include a birefringence-customized stacking technique with the building blocks of double refraction and a photorefractive integration technique with the photorefractive local holograms thermally fixed by CO2 laser heating. The principles are introduced and the corresponding configurations are given, and the examples of various integrated digital optical computing systems such as logic processor, morphological image processor, and interconnection networks are shown.

关键词： optical integration double refraction photorefractive effect hologram local heating thermal fixing optical computing system calcite lithium niobate

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Compact two-step parallel modified-signed-digit adder/subtractor based on binary logic operations using electron-trapping devices

Compact two-step parallel modified-signed-digit adder/subtra...

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conference on photonic devices and algorithms for computing

作者： Li, GQ Qian, F Ruan, H Liu, LR Acad Sinica Shanghai Inst Opt & Fine Mech Shanghai 201800 Peoples R China

ISBN: (纸本)0819432911

A compact two-step modified-signed-digit arithmetic-logic array processor is proposed. When the reference digits are programmed, both addition and subtraction can be performed by the same binary logic operations regardless of the sign of the input digits. The optical implementation and experimental demonstration using an electron-trapping device are shown. Each digit is encoded by a single pixel, and no polarization is included. Any combinational logic can be easily performed without optoelectronic and electro-optic conversions of the intermediate results. The system is compact, general-purpose, simple to align and has a high signal-to-noise ratio.

关键词： optical computing parallel processing logic-based optical processing

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