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 t...
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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.
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 bi...
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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.
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 wer...
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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 computingdevices, 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 computingdevices, 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.
This is a collection of papers presented at the Topical Meeting on Optical BistabiJity (OB3) held December 2-4,1985 in Tucson, Arizona. The increase in attendance to almost 200 shows that interest continues to grow in...
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ISBN:
(数字)9783642465802
ISBN:
(纸本)9783642465826
This is a collection of papers presented at the Topical Meeting on Optical BistabiJity (OB3) held December 2-4,1985 in Tucson, Arizona. The increase in attendance to almost 200 shows that interest continues to grow in the sub ject of optical bistability (OB) and its wider implications both in application to "optical digital computing" and to basic physics, notably instabilities and spatial effects. The maturing of the field is evidenced by the fact that the number of experimental papers has caught up with the number of theoretical ones. These trends were already apparent in OB2 and the 1984 Royal Society Meeting on Optical Bistabilty, Dynamical Nonlinearity and photonic Logic. Progress in *** topics included guided-wave OB, mostly ther mal, picol'econd switching, studies on quite a number of new materials, op tical computing, and pattern recognition using arrays of nonlinear etalons. Theoretical progress ranged from rather practical calculations on device per formance, noise effects on switching, and transverse and longitudinal spatial effects to fundamental studies of dynamics, instabilities, and chaos. The conference also included both theoretical ideas on optical computer *** and intrinsic OB circuit elements such as as full adder as well as *** first demonstration of an intrinsic optical circuit in the form of a cas cadable loop with bufferd ***. A first demostration of a simple pattern recognition algorithm using 2-D arrays of spots on a ZnSe *** filter was reported.
We are proud to introduce the proceedings of the Seventh International C- ference on Parallel Problem Solving from Nature, PPSN VII, held in Granada, Spain, on 7–11 September 2002. PPSN VII was organized back-to-back...
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ISBN:
(数字)9783540457121
ISBN:
(纸本)9783540441397
We are proud to introduce the proceedings of the Seventh International C- ference on Parallel Problem Solving from Nature, PPSN VII, held in Granada, Spain, on 7–11 September 2002. PPSN VII was organized back-to-back with the Foundations of Genetic algorithms (FOGA) conference, which took place in Torremolinos, Malaga, Spain, in the preceding week. ThePPSNseriesofconferencesstartedinDortmund,Germany[1].Fromthat pioneering meeting, the event has been held biennially, in Brussels, Belgium [2], Jerusalem, Israel [3], Berlin, Germany [4], Amsterdam, The Netherlands [5], and Paris, France [6]. During the Paris conference, several bids to host PPSN 2002 were put forward; it was decided that the conference would be held in Granada with Juan J. Merelo Guerv´ os as General Chairman. The scienti?c content of the PPSN conference focuses on problem-solving paradigms gleaned from natural models, with an obvious emphasis on those that display an innate parallelism, such as evolutionary algorithms and ant-colony optimization algorithms. The majority of the papers, however, concentrate on evolutionary and hybrid algorithms, as is shown in the contents of this book and *** applications,betheytoclassicalproblemsortoreal-worldengineeringproblems, which shows how bioinspired algorithms are extending their use in the realms of business and enterprise.
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