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

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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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Rapid reconfiguration in an acousto-optic crossbar interconnection network

Rapid reconfiguration in an acousto-optic crossbar interconn...

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conference on photonic devices and algorithms for computing

作者： Gamo-Aranda, J Mcleod, R Horche, PR Wagner, K Univ Politecn Madrid ETSI Telecomunicac Dept TFO E-28040 Madrid Spain

ISBN: (纸本)0819432911

We demonstrate the operation and rapid reconfiguration of a 12x12 Acousto-Optic photonic Crossbar (AOPC). This AOPC can implement any desired permutation, fan-in, or fan-out interconnection between any subset out of twelve single-mode input fibers into any subset out of twelve single-mode output fibers. The system uses one large-aperture Acousto-Optic Deflector (AOD) driven by a sum-of-tones RF-waveform produced by an arbitrary waveform generator (ARB) and computed from an experimentally measured lookup table, thus reducing the control complexity of the system. The design, based on the momentum-space technique, includes optical and acoustical rotation for the AOD, in order to optimize the efficiency of the desired interconnections and minimize the undesirable negative first-order acoustooptic Bragg-diffractions. A limitation in this type of systems is the unavoidable reconfiguration (dead) time introduced by the AOD itself, which can result in crosstalk between the individual input channels during that period of time. In this paper, we experimentally investigate the reconfiguration time of this AOPC, by switching between two different crossbar patterns, and then measuring the time during which the detected signal can not be individually resolved for each input channel. Coupling efficiency problems and alignment procedures are also discussed and analyzed.

关键词： acoustooptic devices photonic switch optical crossbar

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Optical lookahead-mode conversion from modified signed-digit to 2's complement representation

Optical lookahead-mode conversion from modified signed-digit...

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conference on photonic devices and algorithms for computing

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

ISBN: (纸本)0819432911

The modified signed-digit (MSD) number system offers parallel arithmetic operations because of its redundancy property. For exploiting the high parallelism of the MSD representation, MSD form and 2's complement binary form have to be converted to and from each other. In this paper, an efficient lookahead-mode conversion algorithm is introduced. The operation can be performed in parallel by binary logic and is thus suitable for optical implementation. The optical system utilizing a single electronic trapping (ET) device is suggested to realize the required operations. By programming the illumination of data arrays, any complex logic operations of multiple variables can be performed easily. The main hardware can be stacked to construct a compact optoelectronic processor of versatile functions. A proof-of-the-principle experiment is demonstrated.

关键词： optical computing parallel processing number system number conversion

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Optical Supercomputing 1

引用

丛书名： Lecture Notes in Computer Science

1000年

作者： Shlomi Dolev Mihai Oltean

ISBN: (数字)9783642224942

ISBN: (纸本)9783642224935

This book constitutes the thoroughly refereed post-conference proceedings of the Third International Workshop on Optical Supercomputing, OSC 2010, held in Bertinoro, Italy, in November 2010. The 13 papers presented were carefully reviewed and selected for inclusion in this book. Being an annual forum for research presentations on all facets of optical computing for solving hard computation tasks, OCS addresses the following topics of interest: designs or demonstrations of optical computing devices, algorithmics and complexity issues of optical computing, computation representation by photons and holograms, neural and brain inspired architectures, electro-optic devices for interacting with optical computing devices, practical implementations, analysis of existing devices and case studies, optical photonics and laser switching technologies, optical and photonic memories, optical signal processing subsystems, optical networks for high-performance computing, optical interconnections, quantum optical systems, applications and algorithms for optical devices, Alpha particles, X-rays, and nano-technologies for optical computing.

关键词： Artificial Intelligence Quantum Information Technology, Spintronics Quantum Physics Quantum Optics Optics, Lasers, photonics, Optical devices Theory of Computation

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