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Decentralized Multigrid for In-situ Big Data Computing

Tsinghua Science and Technology 2015年第6期20卷 545-559页

作者： Goutham Kamath Lei Shi edmond chow Wenzhan Song Junjie Yang Department of Computer Science Georgia State University College of Computing Georgia Institute of Technology School of Electric and Information Engineering Shanghai University of Electric Power

Modern seismic sensors are capable of recording high precision vibration data continuously for several months. Seismic raw data consists of information regarding earthquake’s origin time, location, wave velocity, ***, these high volume data are gathered manually from each station for analysis. This process restricts us from obtaining high-resolution images in real-time. A new in-network distributed method is required that can obtain a high-resolution seismic tomography in real time. In this paper, we present a distributed multigrid solution to reconstruct seismic image over large dense networks. The algorithm performs in-network computation on large seismic samples and avoids expensive data collection and centralized computation. Our evaluation using synthetic data shows that the proposed method accelerates the convergence and reduces the number of messages exchanged. The distributed scheme balances the computation load and is also tolerant to severe packet loss.

关键词： distributed multigrid cyber physical system big da

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Efficient and wideband acousto-optic modulation on thin-film lithium niobate for microwave-to-photonic conversion

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Photonics Research 2021年第7期9卷 1182-1190页

作者： AHMED E.HASSANIEN STEFFEN LINK YANSONG YANG edmond chow LYNFORD L.GODDARD SONGBIN GONG Holonyak Micro and Nanotechnology Laboratory Department of Electrical and Computer EngineeringUniversity of Illinois at Urbana-ChampaignUrbanaIllinois 61801USA

Microwave photonics,a field that crosscuts microwave/millimeter-wave engineering with optoelectronics,has sparked great interest from research and commercial sectors. This multidisciplinary fusion can achieve ultrawide bandwidth and ultrafast speed that were considered impossible in conventional chip-scale microwave/millimeterwave systems. Conventional microwave-to-photonic converters,based on resonant acousto-optic modulation,produce highly efficient modulation but sacrifice bandwidth and limit their applicability for most real-world microwave signal-processing applications. In this paper,we build highly efficient and wideband microwaveto-photonic modulators using the acousto-optic effect on suspended lithium niobate thin films. A wideband microwave signal is first piezoelectrically transduced using interdigitated electrodes into Lamb acoustic waves,which directly propagates across an optical waveguide and causes refractive index pertp urbation through the photoelastic effect. This approach is power-efficient,with phase shifts up to 0.0166 rad∕m W over a 45μm modulation length and with a bandwidth up to 140 MHz at a center frequency of 1.9 GHz. Compared to the state-ofthe-art,a 9×more efficient modulation has been achieved by optimizing the acoustic and optical modes and their interactions.

关键词： wideband millimeter waveguide

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