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Polarization insensitive SOAs in AlInGaAs at 1550 nm

Polarization insensitive SOAs in AlInGaAs at 1550 nm

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Optical Fiber Communication (OFC) Conference

作者： P. Koonath Sangin Kim Woon-Jo Cho A. Gopinath Electrical Computer Engineering Department University of Minnesota Minneapolis MN USA Access Network Research Laboratory Korea Telecom Daejeon South Korea Photonics Rerearch Center Korea Institute of Science and Technology Seoul South Korea

ISBN: (纸本)1557527008

Numerical calculations have been performed for polarization insensitive amplifiers in AlInGaAs material system for the 1550 nm wavelength window. SOAs fabricated and tested at 1527 nm show a maximum gain difference of 0.9 dB at 60 mA of drive current between the TE and the TM modes. A polarization insensitive spectral bandwidth of 40 nm was observed where the gain difference between the two polarizations was found to be less than 1 dB.

关键词： Semiconductor optical amplifiers Optical wavelength conversion Optical sensors Optimized production technology Bit error rate Optical interferometry Stimulated emission Optical polarization Transfer functions Optical amplifiers

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Greedy information acquisition algorithm: a new information theoretic method for network growing

Greedy information acquisition algorithm: a new information ...

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International Joint Conference on Neural networks (IJCNN)

作者： R. Kamimura T. Kamimura O. Uchida T. Takeuchi Information Science Laboratory and Future Science and Technology Joint Research Center Tokai University Hiratsuka Kanagawa Japan Department of English Senshu University Kawasaki Kanagawa Japan Department of Network Engineering Kanagawa Institute of Technology Atsugi Kanagawa Japan Human-Computer Interaction Group Institute for Human Science and Biomedical Engineering National Institute for Advanced Industrial Science and Technology Tsukuba Japan

In this paper, we propose a new information theoretic network growing algorithm. The new approach is called greedy information acquisition, because networks try to absorb as much information as possible in every stage of learning. In the first stage, two competitive units compete with each other by maximizing mutual information. In the successive stages, new competitive units are gradually added and information is maximized. Through greedy information maximization, different sets of important features in input patterns can be cumulatively discovered in successive stages. We applied our approach to a language classification problem. Experimental results confirmed that different features in input patterns are gradually discovered.

关键词： Biomedical engineering Information science Humans Mutual information Neural networks Neurons

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Polarization insensitive optical amplifiers in AlInGaAs

Polarization insensitive optical amplifiers in AlInGaAs

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Optical Fiber Communication (OFC) Conference

作者： P. Koonath S. Kim W.-J. Cho A. Gopinath Electrical Computer Engineering Department University of Minnesota Minneapolis MN USA Access Network Research Laboratory Korea Telecom Taejon South Korea Photonics Research Center Korea Institute of Science and Technology Seoul South Korea

Optical gain calculations have been performed for polarization insensitive amplifiers in AlInGaAs/InP for both 1300 nm and 1550 nm windows. Amplifiers, fabricated and tested at 1300 nm, show less than 0.3 dB gain diff... 详细信息

ISBN: (纸本)1557526559

关键词： Optical polarization Stimulated emission Semiconductor optical amplifiers Optical amplifiers Optical wavelength conversion Optical sensors Conducting materials Optical materials Tensile strain Tellurium

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network and service anomaly detection in multi-service transaction-based electronic commerce wide area networks

Network and service anomaly detection in multi-service trans...

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IEEE Symposium on computers and Communications (ISCC)

作者： L. Ho S. Papavassiliou Bell Laboratories Network Research Laboratory Lucent Technologies Inc. Holmdel NJ USA Electrical and Computer Engineering Department New Jersey Center for Multimedia Research New Jersey Institute of Technology Newark NJ USA

Proactive detection of network failures and performance degradations is a key to rapid fault recovery and thus robust networking. The authors present methodologies and algorithms that were developed in order to enhance the proactive and adaptive detection of network/service anomalies (failures and performance degradations) in transaction based electronic commerce wide area networks (WANs). Specifically our proactive network/service anomaly detection method detects network/service performance degradations and failures in multiple service class networks, where performances of service classes are mutually dependent and strongly correlated, and where external or environmental factors (e.g., non-managed or non-monitored equipment within customer premises) can strongly impact network and service performances. The authors describe and implement algorithms that: (1) sample and convert raw transaction records to service class based performance data in which potential network anomalies are highlighted; (2) construct adaptive and service class based performance thresholds for real time detection of network and service anomalies; and (3) perform real time network anomaly detection.

关键词： Intelligent networks Electronic commerce Fault detection Degradation Environmental management Electrical fault detection Condition monitoring Wide area networks Robustness network topology

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A coarse frequency offset estimation in an OFDM system using the concept of the coherence phase bandwidth

A coarse frequency offset estimation in an OFDM system using...

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IEEE International Conference on Communications (ICC)

作者： Keukjoon Bang Namshin Cho Jaehee Cho Kwanchul Kim Hyuncheol Park Daesik Hong Department of Broadcasting & Communication Induk Institute of Technology Seoul South Korea Comm. Network Laboratory Research & Development Center Samsung Electronics Company Limited Suwon South Korea Department of Electrical & Computer Engineering Yonsei University Seoul South Korea

A new coarse frequency offset estimation algorithm is proposed which performs robust operation in the presence of a symbol timing offset in an allowed range. The effect of a symbol timing offset on estimating a coarse frequency offset is analyzed and the coherence phase bandwidth according to the allowed symbol timing offset is introduced. In addition, a new technique for performing the coarse frequency estimation using the coherence phase bandwidth is described. Simulation results show that the proposed algorithm estimates a coarse frequency offset well under both AWGN and multipath channels even in the presence of the symbol timing offset within an allowed range.

关键词： Frequency estimation Phase estimation OFDM Timing Bandwidth Robustness AWGN Digital video broadcasting Digital audio broadcasting Radio broadcasting

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Implementing enhanced network maintenance for transaction access services: tools and applications

Implementing enhanced network maintenance for transaction ac...

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IEEE International Conference on Communications (ICC)

作者： S. Papavassiliou M. Pace A. Zawadzki L. Ho New Jersey Institute of Technology New Jersey Center for Multimedia Research Electrical and Computer Engineering Department University Heights Newark NJ USA AT&T Network Architecture Department AT and T Laboratories Middletown NJ USA Networking Research Laboratory Bell Laboratories Lucent Technologies Inc. Holmdel NJ USA

We describe the design and implementation of automated methodologies and tools that facilitate the implementation of an enhanced maintenance process in order to provide improved quality of service offered to the customers for the transaction access services (TAS) network. The emphasis of our work is placed on the identification, filtering and correlation of event occurrences that indicate problems that do not necessarily generate alarmed conditions on the conventional network management systems, and on the proactive service/fault management and detection based on dynamically defined violations of the base-lined performance profiles. Such an approach enhances considerably the network management and maintenance process, by identifying possible situations/incidents that may affect the network performance, and by correlating those incidents to the potentially affected elements, services and customer applications.

关键词： Filtering Humans Fault diagnosis Application software Quality of service Wide area networks Switches Laboratories computer architecture Event detection

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A detailed experimental performance evaluation on TCP over UBR

A detailed experimental performance evaluation on TCP over U...

引用

IEEE International Conference on ATM

作者： L. Jaussi M. Lorang J. Nelissen Telecommunications Laboratory Swiss Federal Institute of Technology Lausanne Switzerland Inst. of Communication Networks and Computer Engineering University of Stuttgart Stuttgart Germany Network Architecture Traffic Technology Team Alcatel-Alsthom Corporate Research Center Belgium

The ATM service category UBR is intended for non-real-time applications that do not require guaranteed QoS commitments. With additional, relatively inexpensive control functions such as packet discard schemes, UBR could become a cost-effective alternative for the transmission of data traffic; offering a straightforward and flexible solution as opposed to nrt-VBR and GFR that applies stricter traffic specifications as well as ABR with its sophisticated and complex rate-control protocol. This paper presents the results obtained from a comprehensive set of experiments with TCP over UBR, comprising of measurements taken on different protocol layers. The goal is to experimentally investigate the performance of UBR to carry TCP traffic, to evaluate the performance gain achievable by packet discard schemes and TCP parameter tuning, to study the influence of the TCP implementation, and in a final step, to relate the measurements to simulation results.

关键词： Asynchronous transfer mode Traffic control Switches Protocols Size measurement Laboratories Communication networks computer networks Telecommunication computing computer architecture

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Throughput analysis of selective cell discard schemes in transport layer over ATM networks

Throughput analysis of selective cell discard schemes in tra...

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IEEE Conference and Exhibition on Global Telecommunications (GLOBECOM)

作者： N. Tsukutani K. Kawahara T. Takine H. Sunahara Y. Oie Information Network Department Takasago Works Hitachi Cable Limited Hitachi Japan Department of Computer Science and Electronics Kyushu Institute of Technology Iizuka Japan Department of Information Systems Engineering Osaka University Suita Japan Information Technology Center Nara Institute of Science and Technology Ikoma Japan

In transport layer protocols over ATM networks, a packet is discarded when one or more cells are lost in that packet, and the destination node then requires its source to retransmit the corrupted packet. Therefore, once one of cells constituting a packet is lost, its subsequent cells of the corrupted packet waste network resources. In this paper, we propose the throughput analysis in transport layer with selective cell discard schemes and selective repeat ARQ. In the analysis, we suppose that sources steadily generate cells due to the packet retransmission; the resulting state will be referred to as source saturation, which makes the analysis very tractable from a computational point of view. Through some numerical results, we can clarify the impacts of the average number of packet length, the buffer size and the number of sources on the throughput performance of selective cell discard schemes.

关键词： Throughput Intelligent networks Asynchronous transfer mode Switches Buffer overflow Degradation Communication system traffic control Traffic control Packet switching TCPIP

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Small high-bandwidth ATM switch

Small high-bandwidth ATM switch

引用

Broadband Access Systems

作者： Mekkittikul, Adisak McKeown, Nick Izzard, Martin Departments of Electrical Engineering and Computer Science Stanford University Stanford CA 94305-4070 United States Core Network Communications Laboratory DSP R and D Center Corporate Research and Development Technology PO Box 655474 Dallas TX 75265 United States

The Tiny Tera is an all-CMOS 320 Gbps, input-queued ATM switch suitable for non-ATM applications such as the core of an Internet router. The tiny tera efficiently supports both unicast and multicast traffic. Instead of using optical switching technology, we achieve a high switching-bandwidth by using less expensive and proven CMOS technology. Because of limitations in memory and interconnection bandwidths, we believe that to achieve such a high-bandwidth switch requires an innovative architecture. By using virtual output queuing (VOQ) and novel scheduling algorithms, the tiny tera will achieve a maximum throughput close to 100% without the need for internal speedup. ©2005 Copyright SPIE - The International Society for Optical engineering.

关键词： Bandwidth

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Three dimensional molecular modeling studies in AIDS research using high performance computing facilities: a ternary complex of HV-1 RT

Three dimensional molecular modeling studies in AIDS researc...

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Annual International Conference of the IEEE engineering in Medicine and Biology Society (EMBC)

作者： N.S. Yadav S. Laxminarayan J.S. Yadav V.N. Pandey S. Singh M.J. Modak Dept. of Biochem. Acad. Comput. Center Piscataway NJ USA Biomedical Engineering Program New Jersey Institute of Technology and John von Neuman Computer Network Princeton USA Department of Biochemistry and Molecular Biology and Academic Computing Center University of Medicine and Dentistry of New Jersey Piscataway NJ USA

The authors present here a complete three-dimensional molecular model structure of the ternary complex (Enzyme-DNA-dNTP) of human immunodeficiency virus-type 1 reverse transcriptase (HIV-1 RT) using high performance computer simulation and molecular modeling techniques. The Ca coordinates of the crystal structure of HIV-1 RT-DNA binary complex as well as biochemical properties of a number of mutant enzymes were used as the basis to model build a prepolymerase ternary complex in which Mg/sup 2+/ ions are also accommodated. The side chains of amino acid residues interacting with the template and primer strands and those stabilizing the dNTP and Mg/sup 2+/ ions in the active site pocket are clearly elucidated in the model. The structural information provided by this model should be useful in understanding the polymerase reaction mechanisms and should permit structure based drug design against HIV-1 RT.

关键词： Acquired immune deficiency syndrome High performance computing Biochemistry Spine Biological system modeling Biology computing DNA computer networks Amino acids Polymers

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