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International Conference on computer Modeling and Simulation, UKSIM

作者： Edi Saputra Kamalrulnizam Abu Bakar Herman Herman Suhaidi Hassan Faculty of Computer Science and Information System Universiti Teknologi Malaysia Malaysia Faculty of Computer Science and Information System Universiti Teknologi Malaysia Faculty of Computer Systems and Communication Networks Universiti Utara Malaysia Malaysia

Advancement in micro-electro mechanical system (MEMS) that integrate mechanical system, sensor, actuator, and electronics has contributed to significant improvement of automation system including security and safety system. This paper will propose a framework of integrated security and safety system that combines microembedded system and computer based system. The framework is designed and developed based on conceptual model of security and safety system for enclosed area such as campus, industrial complex, airport, and oil/gas platform. As infrastructure for connecting the security and safety devices, control panels, and network operating center (NOC), the framework will use hybrid networking technology. Such technology interconnects IP-based and non IP network in form of wired and wireless data communication.

关键词： Mechanical systems communication system security Micromechanical devices Mechanical sensors Sensor systems Actuators Automation computer security Air safety Electrical equipment industry

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Thermo-optic SOI waveguide switch matrix

Thermo-optic SOI waveguide switch matrix

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International Symposium on Photoelectronic Detection and Imaging 2009: Material and Device Technology for Sensors

作者： Chen, Yuan-Yuan Li, Yan-Ping Yu, Jin-Zhong College of Computer Science and Information Engineering Beijing Technology and Business University Beijing 100037 China National Laboratory on Local Fiber-Optic Communication Networks and Advanced Optical Communication Systems Peking University Beijing 100871 China State Key Laboratory on Optoelectronics Institute of Semiconductors Chinese Academy of Sciences Beijing 100083 China

ISBN: (纸本)9780819476623

Optical switches are important devices in optical communications. A blocking 88 thermo-optic waveguide switch matrix and a rearrangeable nonblocking one are designed and fabricated on silicon-on-insulator (SOI) wafer. The building block of the matrix is a 22 switch cell with a Mach-Zehnder interferometer(MZI) configuration, where a general multi-mode interferometer (MMI) serves as splitter/combiners. Nonblocking switch matrix presents excess loss of 10.9dB7tild;13.6dB and crosstalk of -26.6dB7tild;-13.5dB. Blocking one presents excess loss of 6.6dB9.6dB and crosstalk of -25.8dB~-16.8dB. Their extinction ratios vary from 17dB to 25dB. The power consumption of each switch cell is less than *** response time is less than 3s. The power consumption and the response times are much better than that of silica-based or polymer-based switch matrix because of the large thermo-optic coefficient and the high thermal conductivity of silicon. © 2009 SPIE.

关键词： Crosstalk

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Channel estimation for pilot-aided OFDM systems in single frequency network

Channel estimation for pilot-aided OFDM systems in single fr...

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Asia-Pacific Conference on communications

作者： Yiling Wu Yuping Zhao Dou Li State Key Laboratory of Advanced Optical Communication Systems & Networks School of Electronics Engineering and Computer Science Peking University Beijing China

ISBN: (纸本)9781424447848

In single frequency network (SFN), there exist some special long delay spread channels as well as conventional multi-path channels. For pilot-aided orthogonal frequency division multiplex (OFDM) systems, channel estimation is usually accomplished by interpolation with pilots. However, few pilot subcarriers exist within coherent bandwidth under the long delay spread channels in SFN. In this case, conventional interpolation methods cannot work properly. This paper proposes a sine-wave based frequency domain interpolation method for channel estimation of pilot-aided OFDM systems in SFN. As simulation results show, the proposed method gives accurate channel estimation under the long delay spread channels, whereas the mismatched Wiener interpolation filter (WIF) estimates channel response inaccurately. Moreover, the proposed method performs well under conventional multi-path channels, especially for systems which adopt high order modulations.

关键词： Channel estimation OFDM Frequency estimation Interpolation Frequency domain analysis Digital video broadcasting Delay estimation Bandwidth Multimedia communication Frequency division multiplexing

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Two iterative algorithms for blind symbol timing estimation of M-PSK signals

Two iterative algorithms for blind symbol timing estimation ...

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International Workshop on Satellite and Space communications (IWSSC)

作者： Markus Flohberger Wilfried Gappmair Stefano Cioni Institute of Communication Networks and Satellite Communications Graz University of Technology Austria Department of Electronics Computer Science and Systems University of Bologna Italy

Carrier-blind and non-data-aided (NDA) feedforward solutions for symbol timing recovery are particularly important for initial acquisition in burst modems; the Oerder and Meyr (O&M) algorithm is perhaps the most prominent example in this respect. Since usually operated with an oversampling rate of four, alternatives using only two samples per symbol have been suggested in the open literature. On the other hand, Moeneclaey and Batsele introduced an error detector for blind NDA recovery in feedback loops, based on only one sample per symbol. In the current paper, it is shown that this approach can be successfully applied to a feedforward solution. In this context, two estimator variants are developed exhibiting no self-noise effect for M-ary PSK schemes, whereas it turns out that this does not hold true for nonconstant modulus constellations.

关键词： Iterative algorithms Timing Detectors Feedback Signal to noise ratio communication networks Satellite communication Appropriate technology Paper technology computer science

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Quantum random number generator based on the photon number decision of weak laser pulses

Quantum random number generator based on the photon number d...

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Pacific Rim Conference on Lasers and Electro-Optics (CLEO/Pacific Rim)

作者： Wei Wei Hong Guo State Key Laboratory of Advanced Optical Communication Systems and Networks School of Electronics Engineering and Computer Science Peking University Beijing China

We propose a new approach of quantum random number generator (QRNG) based on the photon number decision of weak laser pulses, which permits a high generation rate and convenient tuning of bias.

ISBN: (纸本)9781424438303

We propose a new approach of quantum random number generator (QRNG) based on the photon number decision of weak laser pulses, which permits a high generation rate and convenient tuning of bias.

关键词： Random number generation Optical pulse generation Testing Laser modes Cryptography Detectors Optical pulses Quantum computing Laser theory Laser tuning

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Enhanced light-extraction in GaN light-emitting diode with binary blazed grating reflector

Enhanced light-extraction in GaN light-emitting diode with b...

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Photonics and Optoelectronics Meetings (POEM) 2008: Optoelectronic Devices and Integration

作者： Wenhua, Wu Huaming, Wu Tingwei, Wu Yi, Wang Zhiping, Zhoub Wuhan National Laboratory for Optoelectronics Huazhong University of Science and Technology Wuhan Hubei 430074 China State Key Laboratory on Advanced Optical Communication Systems and Networks Peking University Beijing 100871 China School of Electrical and Computer Engineering Georgia Institute of Technology Atlanta GA 30332 United States

ISBN: (纸本)9780819475381

Enhancement of light extraction in a GaN light-emitting diode (LED) employing a binary blazed grating reflector (BBGR) is presented. The BBGR consists of asymmetrically periodic structure etched on the GaN layer. Rigorous coupled-wave analysis (RCWA) is adopted to calculate the reflectivity of the BBGR, which shows that it has the characteristics of broadband reflection spectrum and very high reflectivity. The result of high angle-averaged reflectivity up to 94% from 300nm to 450nm predicts the potential enhancement of light-extraction efficiency of GaN LEDs with BBGR. © 2009 SPIE.

关键词： Reflection

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Simple technique to fabricate microscale and nanoscale silicon waveguide devices

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Frontiers of Optoelectronics 2009年第3期2卷 308-311页

作者： Yao CHEN Junbo FENG Zhiping ZHOU Christopher J.SUMMERS David S.CITRIN Jun YU Department of Electronic Science and Technology Huazhong University of Science and Technology Wuhan National Laboratory for Optoelectronics Huazhong University of Science and Technology State Key Laboratory on Advanced Optical Communication Systems and Networks Peking University School of Electrical and Computer Engineering Georgia Institute of Technology School of Materials Science and Engineering Georgia Institute of Technology Unité Mixte Internationale 2958 Georgia Tech-CNRS Georgia Tech Lorraine

Fabrication of microscale and nanoscale silicon waveguide devices requires patterning silicon, but until recently, exploitation of the technology has been restricted by the difficulty of forming ever-small features with minimum linewidth fluctuation. A technique was developed for fabricating such devices achieving vertical sidewall profile, smooth sidewall roughness of less than10 nm, and fine features of 40 nm. Subsequently, silicon microring resonator and silicon-grating coupler were realized using this technique.

关键词： nanofabrication silicon waveguide roughness microring resonator grating coupler

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Effect of the dipole-dipole interaction for two atoms with different couplings in a non-Markovian environment

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Physical Review A 2009年第1期79卷 012309-012309页

作者： Yang Li Jiang Zhou Hong Guo []CREAM Group State Key Laboratory of Advanced Optical Communication Systems and Networks (Peking University) and Institute of Quantum Electronics School of Electronics Engineering and Computer Science and Center for Computational Science and Engineering (CCSE) Peking University Beijing 100871 People’s Republic of China

Using a nonperturbative method, we study the exact entanglement dynamics of two two-level dipole-dipole interacting atoms coupled to a common non-Markovian reservoir with different coupling strengths. Besides analyzing the conditions for the existence of a steady state, we find that, although the dipole-dipole interaction could destroy the stationary entanglement, a relatively strong dipole-dipole interaction does suppress disentanglement in the initial period of time. These results are helpful for the practical engineering of entanglement in the future.

关键词： atomic moments electric moments quantum entanglement quantum optics CAVITY ENTANGLEMENT DECAY

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Non-markovian dynamics of entanglement in a multipartite system

Non-markovian dynamics of entanglement in a multipartite sys...

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Pacific Rim Conference on Lasers and Electro-Optics (CLEO/Pacific Rim)

作者： Jiang Zhou Hong Guo CREAM Group State Key Laboratory of Advanced Optical Communication Systems and Networks and Institute of Quantum Electronics School of Electronics Engineering and Computer Science Peking University Beijing China

We study exact entanglement dynamics of a couple of two-level atoms interacting with independent structured reservoirs. Besides analyzing bipartite entanglement qualitatively, we derive quantitative criteria for entan... 详细信息

ISBN: (纸本)9781424438303

关键词： Reservoirs Electrostatic discharge Interconnected systems Information analysis Solids Laboratories Optical fiber communication Quantum computing Quantum entanglement computer science

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Optimized pulse shaping in electromagnetically induced transparency slow light medium

Optimized pulse shaping in electromagnetically induced trans...

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Pacific Rim Conference on Lasers and Electro-Optics (CLEO/Pacific Rim)

作者： Wenzhuo Tang Bin Luo Hong Guo CREAM Group State Key Laboratory of Advanced Optical Communication Systems and Networks and Institute of Quantum Electronics School of Electronics Engineering and Computer Science Peking University Beijing China

Time delay and broadening of six isolated pulses are studied and experimentally demonstrated in electromagnetically induced transparency (EIT) slow light medium. The optimal pulse for largest delay (smallest broadenin... 详细信息

ISBN: (纸本)9781424438303

关键词： Pulse shaping methods Slow light Probes Optical coupling Space vector pulse width modulation Bandwidth Mirrors Delay effects Delay lines Optical pulse shaping

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