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conference on all-optical networking - architecture, control, and Management issues

作者： Senior, JM Phillips, AJ Vetter, PJ Martin, CM van Deventer, MO Univ Hertfordshire Hatfield AL10 9AB Herts England

ISBN: (纸本)0819429929

To enable the SuperPON systems developed within the ACTS-PLANET (Photonic Local Access network) project to meet the availability targets;of the offered services redundant elements are provided to give protection in the event of failures, Using extensive reliability data a semiconductor optical amplifier (SOA) based SuperPON architecture is' evaluated in terms of availability. An amount of redundancy (mainly of optical amplifiers and of cable plant) is required to provide, the availability for the system to support telephony in addition to the broadband service basket. Cable cut is seen to be a dominant factor. The telephony availability requirement can be achieved for the Fibre To The Home (FTTH) scenario with redundancy most importantly in the first distribution section and in the amplified splitter. The possible use of dual homing to counter catastrophic failures and the issues surrounding protection switching are also discussed.

关键词： SuperPON optical amplifiers redundancy protection optical access network dual homing

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The control and the command of the Vivitron, a system managed with an OODBMS

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IEEE TRANSACTIONS ON NUCLEAR SCIENCE 1998年第4期45卷 2020-2025页

作者： Bauman, R Diaz, T Jbil, A Kapps, E Knaebel, R Marsaudon, JC Michel, L Persigny, J Prevot, G Stamm, Y Inst Rech Subatom F-67037 Strasbourg 02 France

The architecture of the control system of the Vivitron is distributed. Thirteen VME crates, equipped with MC68040 boards, working at a potential from 0 to 20 MV, concentrate the measurements and the commands. These concentrators and the control room are federated in a private optical Ethernet network. The intelligence of the system is shared between the concentrators. 4 workstations inside the control room are strictly dedicated to the animation of the graphical user interface, managed with SL-GMS. The mechanisms of communication are only based on industrial standards. The whole system is described in an object oriented data base. Each element, hardware device or software module, is represented in the database by numerical values such as addresses, calibrations or thresholds and a specific C function describing its behavior. The data base generates automatically the code exclusively from this description.

关键词： control systems Object oriented databases communication system control optical control optical fiber networks Ethernet networks Intelligent systems Workstations Animation Graphical user interfaces

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Architectural considerations in the design of WDM-based optical access networks

Architectural considerations in the design of WDM-based opti...

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conference on all-optical networking - architecture, control, and Management issues

作者： Modiano, E MIT Lincoln Lab Lexington MA 02173 USA

ISBN: (纸本)0819429929

We describe a WDM-based optical access network architecture for providing broadband Internet services. The architecture uses a passive collection and distribution network and a configurable Feeder network. Unlike earlier papers that concentrate on the physical layer design of the network, we focus on higher layer architectural considerations. In particular we discuss the joint design of the electronic and optical layers including: WDM Medium Access control protocols;the choice of electronic multiplexing and switching between the IP and WDM layers;joint optical and electronic protection mechanisms;network reconfiguration algorithms that alter the logical topology of the network in response to changes in traffic;and traffic grooming algorithms to minimize the cost of electronic multiplexing.

关键词： network architectures Wavelength division multiplexing optical networks Switches optical design Multiplexing Stars Transceivers Ranging Wavelength division multiplexing networks

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architecture of a multimedia communication system for technical documentation in a modern factory

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COMPUTERS IN INDUSTRY 1998年第1-2期36卷 83-93页

作者： Papandreou, CA Adamopoulos, DX Hellen Telecommun Org Training & Res Ctr GR-11473 Athens Greece Univ Surrey Dept Elect & Elect Engn Ctr Satellite Engn Res Surrey England

This paper examines the influence of multimedia communication services and electronic document systems in the management of technical documentation within a modern factory. After a brief introduction in Computer-integrated Manufacturing (CIM) and multimedia communication systems, the role of technical documentation in a CIM environment is examined, and the architecture of a Distributed Multimedia Electronic Document System (DMEDS) is proposed. The basic features/operations and the constituent parts of the proposed DMEDS are then analysed. Two of them, the network infrastructure and the necessary software structure, are examined in considerable detail. Finally, a number of important design issues are addressed, and some conclusions are drawn. (C) 1998 Elsevier Science B.V. all rights reserved.

关键词： multimedia communications CIM electronic document systems technical documentation

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Coherent optical pulse CDMA systems based on I-Q noncoherent demodulation of M-ary orthogonal signals

Coherent optical pulse CDMA systems based on I-Q noncoherent...

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conference on all-optical networking - architecture, control, and Management issues

作者： Huang, W Andonovic, I Univ Strathclyde Dept EEE Glasgow G1 1XW Lanark Scotland

ISBN: (纸本)0819429929

Coherent optical pulse CDMA systems based on noncoherent demodulation of M-ary orthogonal signals are proposed. Each of the J information bits is encoded and transmitted as a M (=2(J)) symbol word of a family of Hadamard-Walsh orthogonal sequences. A pulsed laser is employed at the transmitter, modulated by the symbol sequence and encoded by an optical tapped delay-line encoder to generate a unique optical pseudo-random sequence (bipolar code). At the receiver, a pulsed local oscillator followed by a tapped delay-line encoder is employed to produce the optical code sequence of the intended user. Correlation between the received signal and the local code is executed through a coherent optical correlator comprising a 3dB coupler and balanced detector. Noncoherent demodulation of the M-ary orthogonal signals based on the maximum-likelihood criterion is used to recover the information bits. After a description of the network implementation, the performance of the system is theoretically analyzed and its numerical evaluation given. It is shown that the ratio of the number of available users to the practical code gain at a BER=10(-9) is approximately 3.7%-5%. Although a fewer number of users can be supported compared to full coherent reception (10%), the system no longer requires phase locking whilst keeping the advantages of the coherent approach. Hence the linewidth requirement of the laser sources is relaxed. The performance and the implementation of the system are still significantly better than conventional incoherent optical pulse CDMA systems utilising unipolar codes.

关键词： optical communication and network coherent optical purse CDMA Hadamard-Walsh orthogonal sequences noncoherent demodulation of M-ary orthogonal signals multiuser interference shot noise

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Implementation and evaluation of information models for all-optical networks - An SDL based approach for rapid prototyping

Implementation and evaluation of information models for all-...

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conference on all-optical networking - architecture, control, and Management issues

作者： Carls, G Lehr, G Deutsch Telekom AG Technol Ctr Darmstadt Platforms Value Added Serv Network & Serv Managem D-64307 Darmstadt Germany

ISBN: (纸本)0819429929

This paper presents an approach that introduces the formal Specification and Description Language (SDL) in the development of TMN systems. Using the management of optical networks as an example it will be outlined how SDL can be used to ease implementation and evaluation of management systems. Owing to the formal nature of SDL system behavior can be specified thoroughly and prototypes can be generated semiautomatically. Applying this approach, dynamic behavior can be evaluated by integrating the generated prototype in an SDL test and simulation environment, In this environment trace tools support: description of management interactions in Message Sequence Charts (MSC) at runtime, Such traces permit to draw conclusions concerning the correctness and proper design of information models. The described methodology is being applied to the development of prototype management applications in the research project MOON2. It will be described how existing draft information models (e.g. information models for the management of optical networks) can be evaluated by mapping them to SDL.

关键词： telecommunication management network (TMN) information model optical networks wavelength division multiplexing (WDM) Specification and Description Language (SDL) Message Sequence Charts (MSC) rapid prototyping

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all-optical routing using wavelength recognizing switches

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JOURNAL OF LIGHTWAVE TECHNOLOGY 1998年第12期16卷 2243-2254页

作者： Hoanca, B Dubovitsky, S Zhu, DXX Sawchuk, AA Steier, WH Dapkus, PD Univ So Calif Dept Elect Engn Los Angeles CA 90089 USA

This paper presents system considerations for optical packet-switched networks using a wavelength recognizing switch (WRS) device for all-optical control and routing. networks with the WRS device are capable of truly all-optical routing;the packet header is processed in the optical domain. This unique feature allows the self-routing of optical packets in a flexible and dynamically reconfigurable way, but introduces new challenges for the network architect. Our novel architecture combines the use of the WRS with arrayed waveguide devices in a powerful addressing mode. In this paper we explore some of the system issues, including crosstalk, noise performance, cascadability. We present experimental data on a broad-area WRS device we fabricated and assess the feasibility of an integrated version of the device.

关键词： communication system routing local area networks multistage interconnection networks networks optical mixers optical planar waveguides packet switching semiconductor optical amplifiers wavelength division multiplexing

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all-optical backbone for a national B-ISDN network

All-optical backbone for a national B-ISDN network

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Proceedings of the 1998 conference on all-optical networking: architecture, control, and Management issues

作者： DeMartino, Kevin A. Dynamics Research Corp Andover United States

Fiber optic capabilities can be exploited to greatly simplify communication networks while at the same time greatly expanding their capabilities. With fiber optic technology, it becomes feasible to construct a broadband integrated services digital network (B-ISDN) that is scaled to cover the United States and can provide an STM-1 (155 Mb/s) interface for each subscriber. This paper describes an all-optical backbone for this national B-ISDN network. A switching technique based on spatial gating and shifting of optical beams is presented. With this technique, signals are directed along optically transparent paths through the backbone switches, and signal characteristics remain unaltered as signals flow through the backbone.

关键词： optical communication

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Survivable WDM/SDM ring for metropolitan networks

Survivable WDM/SDM ring for metropolitan networks

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conference on all-optical networking - architecture, control, and Management issues

作者： Tammela, S Aarnio, J Tervonen, A VTT Elect Microelect FIN-02044 VTT Finland

ISBN: (纸本)0819429929

We present: a new survivable, reconfigurable wavelength division multiplexing (WDM) ring architecture for the metropolitan area or regional networks. It uses bi-directional WDM and space division multiplexing (SDM) with simple switches for 1+1 protection at optical channel layer. The ring can be realized with available technology at relatively low cost. This architecture has advantages in scalability and reconfigurability. Achievable ring sizes are studied, and adaptability to varying traffic needs, utilizing multi-hop connections, is evaluated.

关键词： wavelength division multiplexing space division multiplexing optical ring network optical telecommunication

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all-optical LAN architectures based on arrayed waveguide grating multiplexers

All-optical LAN architectures based on arrayed waveguide gra...

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conference on all-optical networking - architecture, control, and Management issues

作者： Woesner, H Tech Univ Berlin Telecommun Networks Grp D-1000 Berlin Germany

ISBN: (纸本)0819429929

The paper presents optical LAN topologies which are made possible using an Arrayed Waveguide Grating Multiplexer (AWGM) instead of a passive star coupler to interconnect stations in an all-optical LAN. Due to the collision-free nature of an AWGM it offers the n-fold bandwidth compared to the star coupler. Virtual ring topologies appear (one ring on each wavelength) if the number of stations attached to the AWGM is a prime number. A method to construct larger networks using Cayley graphs is shown. An access protocol to avoid collisions on the proposed network is outlined.

关键词： Stars Local area networks Multiplexers Waveguides Asynchronous transfer mode Wavelength division multiplexing network architectures networks Transceivers Tunable lasers

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