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

共 299 条记录，以下是31-40 订阅

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Digit-set-restricted modified signed-digit arithmetic based on optoelectronic shared content-addressable memory

Digit-set-restricted modified signed-digit arithmetic based ...

引用

conference on photonic devices and algorithms for computing V

作者： Qian, F Li, G Alam, MS Karim, MA Chinese Acad Sci Shanghai Inst Opt & Fine Mech Shanghai 201800 Peoples R China

ISBN: (纸本)081945074X

For efficient optoelectronic implementation of parallel algorithms, a novel two-step digit-set-restricted modified signed-digit (MSD) arithmetic based on content-addressable-memory is presented. With the introduction of the reference digits, carry propagation is avoided by restricting digit sets of the intermediate carry and sum into {(1) over bar ,0} and {0, 1}, respectively. In our new algorithm, without using the complement property for the nonzero outputs, only 12 minterms for all the outputs are required. More significantly, since no complement operation is involved, the optical system needs no additional reflecting unit and mask. An incoherent correlator based optoelectronic shared-content-addressable-memory processor is used to perform the arithmetic operations. A proof-of-the-principle experiment is demonstrated.

关键词： optical computing modified signed-digit representation shared content-addressable memory

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Design of a fiber optical integrator for optical computing

Design of a fiber optical integrator for optical computing

引用

conference on photonic devices and algorithms for computing iiI

作者： Tsao, SL Chiou, SC Hsu, CY Yuan Ze Univ Dept Elect Engn Chungli Taiwan

ISBN: (纸本)0819441848

We present a novel optical integrator with a semiconductor optical amplifier (SOA) and an infinite impulse response fiber optical loop filter in this paper. Adjusting the filter parameters, we can achieve an integrator that can execute integration in a short pulse period. Because the infinite impulse response filter includes a 2x2 electro-optical (E/O) switch, the pulse shape after the integration can be varied according to an external driving voltage. According to the calculation result, the gain coefficient of SOA can provide a design flexibility for approaching a real integration.

关键词： optical integrator semiconductor optical amplifier (SOA) infinite impulse response fiber optical loop filter 2x2 electro-optical (E/O) switch

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Modeling of 2D photonic bandgap structures using a triangular mesh finite difference method

Modeling of 2D photonic bandgap structures using a triangula...

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conference on Design, Fabrication, and Characterization of photonic devices ii

作者： Hadley, GR Sandia Natl Labs Albuquerque NM 87185 USA

ISBN: (纸本)0819443247

A numerical model is presented for computing the out-of-plane losses of a general class of row-defect waveguides formed by the superposition of a two-dimensional photonic crystal onto a slab confinement structure. The usefulness of this model is demonstrated here by calculating the propagation loss of a single-row-defect waveguide composed of hexagonal air holes etched into two different slab structures. The results are interpreted in terms of a simple coupled-mode-theory picture in which loss is due to coupling by the waveguide corrugation between the fundamental and certain radiative slab modes. These calculations show that low-loss photonic crystal waveguides should be possible by carefully engineering the radiation modes of the slab waveguide.

关键词： photonic lattice waveguide loss finite difference

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From Cloud computing to Fog computing: Unleash the Power of Edge and End devices 9

From Cloud Computing to Fog Computing: Unleash the Power of ...

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9th IEEE International conference on Cloud computing Technology and Science (CloudCom)

作者： Hong, Hua-Jun Natl Tsing Hua Univ Dept Comp Sci Hsinchu Taiwan

ISBN: (纸本)9781538606926

Fog computing extends cloud computing to end devices, in order to better support time dependent, location dependent, massive scale, and latency sensitive applications. In this paper, we propose a fog computing ecosystem, implement a real testbed, and evaluate it with diverse usage scenarios. More specifically, we study three usage scenarios and optimize our fog computing platform for them. These usage scenarios are: (i) content dissemination in challenged networks, (ii) crowd-sourced fog computing, and (iii) programmable Internet-of-Things analytics. We leverage and enhance open source projects to realize our fog computing platform. We then solve optimization problems in each usage scenario with novel algorithms. Sample results show that our proposed algorithms outperform baseline algorithms by at least 30.3%, 20.0%, and 89.4% in terms of the main performance metrics of the three usage scenarios, respectively. Several ongoing tasks aim to improve our fog computing platform for: (i) network resource provision, (ii) system dynamics adaption, and (iii) device availability prediction.

关键词： Edge computing Prediction algorithms Cloud computing Heuristic algorithms Animation Rendering (computer graphics) Optimization

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Optical two-step modified signed-digit addition based on binary logic gates

Optical two-step modified signed-digit addition based on bin...

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conference on photonic devices and algorithms for computing IV

作者： Fyath, RS Alsaffar, AAW Alam, MS Univ Basrah Coll Engn Dept Elect Engn Basrah Iraq

ISBN: (纸本)081944555X

A new modified signed-digit (MSD) addition algorithm based on binary logic gates is proposed for parallel computing. It is shown that by encoding each of the input MSD digits and flag digits into a pair of binary bits, the number of addition steps can be reduced to two. The flag digit is introduced to characterize the next low order pair (NLOP) of the input digits in order to suppress carry propagation. The rules for two-step addition of binary coded MSD (BCMSD) numbers are formulated that can be implemented using optical shadow-casting logic system.

关键词： Binary data Logic Logic devices Computer programming Composites Prisms Light emitting diodes Optical logic Spatial light modulators Parallel computing

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Generalized look-ahead number conversion from signed-digit to complement representation with optical logic operations

Generalized look-ahead number conversion from signed-digit t...

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conference on photonic devices and algorithms for computing iiI

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

ISBN: (纸本)0819441848

In this paper a generalized look-ahead logic algorithm for number conversion from signed-digit to its complement representation is developed. By property encoding the signed digits, all the operations are performed by binary logic, and unified logical expressions can be obtained for conversion from modified-signed-digit (MSD) to 2's complement, trinary signed-digit (TSD) to 3's complement, and quarternary signed-digit (QSD) to 4's complement. For optical implementation, a parallel logical array module using electron-trapping device is employed, which is suitable for realizing complex logic functions in the form of sum-of-product. The proposed algorithm and architecture are compatible with a general-purpose optoelectronic computing system.

关键词： Logic Binary data Computer programming Algorithm development Optical logic computing systems Computer architecture Ions Optoelectronics Optical arrays

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Proceedings of SPIE: Materials and devices for photonic Circuits ii

Proceedings of SPIE: Materials and Devices for Photonic Circ...

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Materials and devices for photonic Circuits ii

This Volume 4453 of the conference proceedings contains 23 papers. Topics discussed materials and devices for photonic circuits, photonic bandgap devices, optical devices, photonic materials and technologies and biolo... 详细信息

关键词： Optical materials

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Design and analysis of PBG structure for achieving SOI buffer

Design and analysis of PBG structure for achieving SOI buffe...

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conference on photonic devices and algorithms for computing ViiI

作者： Pan, Mei-Hsiu Chiang, Chia-Chin Tsao, Shyh-Lin Natl Taiwan Normal Univ Inst Electroopt Sci & Technol Opt Fiber Syst Lab 88Sect 4Ting Chou Rd Taipei 116 Taiwan

ISBN: (纸本)0819463892

Single mode SOI waveguide devices with low propagation loss and low insertion loss have been demonstrated at wavelength lambda=13 mu m and 1.55 mu m, respectively. The wavelength resonator devices have many applications in optical communications including wavelength filtering, routing, switching, modulating, multiplexing, optic buffer, and demultiplexing. We use the free carrier plasma dispersion effect to design the switch of SOI buffer and photonic crystal Bandgap (PBG) waveguide buffer devices are simulated by Finite Difference Time Domain (FDTD) methods. The technology have made it possible to create micrometer-size photonics devices based on reasonably low-loss semiconductor waveguides. To characterize SOI buffer waveguides delays, the analysis of wavelength response, the number of propagation modes and the waveguide loss are investigated at wavelength 1.55 mu m.

关键词： photonic crystal band gap (PBG) silicon-on-insulator (SOI) optical switch device optical communication component Finite Difference Time Domain (FDTD)

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Multi-phonon scattering of light with direct transitions between optical modes in uniaxial single crystals and its application to an all-optical computing

Multi-phonon scattering of light with direct transitions bet...

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conference on photonic devices and algorithms for computing VI

作者： Shcherbakov, AS Rodriguez, ET Lopez, AA Natl Inst Astrophys Opt & Elect Puebla 72000 Mexico

ISBN: (纸本)081945494X

A specific case of a multi-phonon non-collinear light scattering in optically uniaxial media is presented. Compared to our previous studies, an innovation lies in the fact that now we consider passing just the quartet of incident light beams through a single crystal that is perturbed by the triplet of coherent acoustic waves. The exact and closed analytical model for describing this strongly nonlinear phenomenon is developed. In fact, specially designed regime of a four-order light scattering whit direct coupling of all the light modes, when transitions of four input light beams into four output light modes are allowed and electronically controlled, is examined. The feasibility of applying such an effect to an all-optical computing and performing an all-optical adder is analyzed.

关键词： all-optical computing logic-based data processing acousto-optical device

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Logic Cells as basic structures to add/drop WDM information signals

Logic Cells as basic structures to add/drop WDM information ...

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conference on photonic devices and algorithms for computing IV

作者： Martin-Pereda, JA González-Marcos, A Univ Politecn Madrid ETS Ingn Telecomunicac E-28040 Madrid Spain

ISBN: (纸本)081944555X

Nowadays, in order to take advantage of fiber optic bandwidth, any optical communications system tends to be WDM. The way to extract a channel, characterized by a wavelength, from the optical fiber is to filter the specific wavelength. This gives the systems a low degree of freedom due to the fact of the static character of most of the employed devices. In this paper we will present a different way to extract channels from an optical fiber with WDM transmission. The employed method is based on an Optically Programmable Logic Cells (OPLC) previously published by us, for other applications as a chaotic generator or as basic element for optical computing. In this paper we will describe the configuration of the OPLC to be employed as a dropping device. It acts as a filter because it will extract the data carried by a concrete wavelength. It does depend, internally, on the wavelength. We will show how the intensity of the signal is able to select the chosen information from the line. It will be also demonstrated that a new idea of redundant information it is the way of selecting the concrete wavelength. As a matter of fact this idea is apparently the only way to use the OPLC as a dropping device. Moreover, based on these concepts, a similar way to route signals to different routes is reported. The basis is the use of photonic switching configurations, namely Batcher or Bayan structures, where the unit switching cells are the above indicated OPLCs.

关键词： photonic switching optical computing add-drop WDM

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