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conference on all-optical communication systems - architecture, control, and network issues III

作者： Chlamtac, I Fang, YG Fumagalli, A Univ. of Texas/Dallas (United States) Politecnico di Torino (United States)

ISBN: (纸本)0819426636

By providing several parallel high-capacity channels in the same fiber, WDM technology is commonly considered to be one of the fundamental solutions for future high speed computer networks. By means of WDM the potential THz bandwidth of the optical fiber can be multiplexed into channels with transmission speed compatible with opto/electronic and electro/optic converters - e.g., transmitters and receivers. However, a fundamental scalability problem has to be solved in order to build larger than LAN size WDM packet switched all-optical networks. Current solutions can not be scaled by simply adding nodes to the existing system due to the limited number of wavelengths and/or the available power budget. The lack of modular solutions, similar to those used in traditional electronic networks, can be attributed to the unavailability of optical technology that can support switching of WDM channels on a per packet basis. Recently, a novel approach was proposed to obtain a packet switching WDM network which is scalable in coverage area, size and number of wavelengths. The approach is based on the combination of two ideas - use of a backbone that connects (bridges) multiple LAN segments, where bridging is done using the new concept of Photonic Slot Routing (PSR). In this concept, packets transmitted simultaneously on the WDM channels in any ''photonic'' slot are switched jointly in the bridge between the LAN segments and the backbone. Thus packets in a given slot remain transmitted on the same path, from their source LAN to the destination LAN and consequently, the bridge is only required to handle complete slots, i.e., all WDM channels jointly. The aim of this work is to present the first analytical model developed to evaluate the performance of the photonic slot concept applied to a single fiber ring backbone system, independently on the interconnected LAN segment topologies, e.g, ring, folded bus, star.

关键词： WDM all-optical systems performance analysis photonic slot routing blocking probabilities optical ring backbone

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Enhancement of laser phase noise to intensity noise conversion by fiber nonlinearity and its impact on the intensity modulation system performance

Enhancement of laser phase noise to intensity noise conversi...

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conference on all-optical communication systems - architecture, control, and network issues III

作者： Morgado, JAP Cartaxo, AVT Instituto Superior Tecnico (Portugal)

ISBN: (纸本)0819426636

Laser phase noise conversion to intensity noise due to fiber dispersion may impose severe degradation in intensity modulation and direct detection (IM-DD) system performance. In this paper, we investigate theoretically and numerically the influence of fiber nonlinearity on the conversion of phase noise to intensity noise at fiber output. Excellent agreement of noise characteristics between simulations results obtained from an accurate solution of the noise driven laser rate equations and theoretical predictions has been achieved. Results reveal that due to the fiber nonlinearity a significant enhancement of magnitude of the relative intensity noise (RIN) spectrum as well as its broadening is observed in the anomalous dispersion regime while a magnitude reduction and narrowing of the spectrum is observed in the normal regime. The system penalty due to RIN at the fiber output in IM-DD transmission systems using external modulator is assessed, The maximum transmission distance imposed by RIN for 1dB of power penalty is presented for various optical power at fiber input in gigabit-per-second transmission systems. It is shown that in the anomalous dispersion regime the RIN enhancement due to the fiber nonlinearity can impose a significant impairment in IM-DD transmission systems through the phase modulation to IM conversion enhancement.

关键词： optical communication intensity noise phase noise fibre dispersion fibre nonlinearity power penalty bit error rate intensity modulation semiconductor laser external modulator

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Evaluation of a SuperPON demonstrator

Evaluation of a SuperPON demonstrator

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all-optical communication systems: architecture, control, and network issues III

作者： Slabbinck, Hans Martin, Claire Van De Voorde, Ingrid Stubbe, Brecht Vaes, Peter Qiu, Xing-Zhi Vandewege, Jan Solina, Paolo Obino, Pietro Alcatel Telecom Research Centre Francis Wellesplein 1 B-2018 Antwerpen Belgium University of Gent IMEC Gent Belgium Torino Italy

This paper presents some results of a SuperPON (lab) demonstrator. The SuperPON is an ATM based passive optical (access) network, intended to support a large split (>2000), and a long range (80 km, of which 70 km in the feeder section, and 10 km in the drop). The overall network capacity is 2.5 Gbit/s TDM downstream at 1550 mn, and 155 Mbit/s TDMA upstream at 1310 nm. This first (lab) demonstrator has been built around an APON system, into which a 2.5 Gbit/s downstream upgrade has been introduced, together with optical amplification to overcome large network losses. This optical amplification consists of EDFAs in the downstream, and switched SOAs in the upstream direction. On the demonstrator set-up, various measurements have been performed to look for the achievable power budget that can be tolerated in the different network sections. The demonstrator does not only show the feasibility of the architecture and optical technologies, but also demonstrates the capabilities of real services.

关键词： optical communication

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The MainStreetXpress core services node - A versatile ATM switch architecture for the full service network

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IEEE JOURNAL ON SELECTED AREAS IN communicationS 1997年第5期15卷 795-806页

作者： Rathgeb, EP Fischer, W Hinterberger, C Wallmeier, E WilleFier, R SIEMENS AG DEPT SEMICONDD-81359 MUNICHGERMANY SIEMENS AG RES LABSD-81359 MUNICHGERMANY

Switching systems based on the ATM principle have outgrown the experimental stage, and are already used today in private and corporate networks, as well as in public wide area networks to provide regular service, ATM has the inherent ability to provide a common basis for transmission and switching functionality in both local and wide area networks. With the potential to support all services available today as well as those envisaged for the future, ATM holds a strong promise for network operators and end customers, To fully exploit this potential, ATM switch architectures are required which provide versatility and modularity in supporting services and protocols, independent scalability of data throughput and control performance over a wide range, and also reliability features adaptable to the respective application scenario, This paper describes in some detail how the MainStreetXpress core services node, which has evolved from the prototype described earlier [5] to a mature central office ATM switch, addresses these issues and provides a future-proof architecture incorporating all of the features required in the B-ISDN era.

关键词： asynchronous transfer mode broad-band communication redundancy switching systems

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Development of hospital-integrated large scale PACS in Seoul National University Hospital

Development of hospital-integrated large scale PACS in Seoul...

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conference on PACS Design and Evaluation - Engineering and Clinical issues, at the Medical Imaging 1997 Meeting

作者： Kim, JH Yeon, KM Han, MC Lee, DH Cho, HI College of Medicine/Seoul National Univ. (United States) College of Medicine/Seoul National Univ. (South Korea) Seoul National Univ. Hospital (South Korea)

ISBN: (纸本)0819424463

The SNUH has started a PACS project with three main goals : to develop a fully hospital-integrated PACS, to develop a cost effective PACS using open systems architecture, and to extend PACS' role to the advanced application such as image guided surgery, multi-media assisted education and research. In order to achieve these goals, we have designed a PACS architecture which takes advantages of client-server computing, high speed communication network, computing power of up-to-date high-end PC, and advanced image compression method. We have installed ATM based communication network in radiology department and in-patient wards, and implemented DICOM compliant acquisition modules, image storage and management servers, and high resolution display workstations based on high-end PC and Microsoft Windows 95 and Windows NT operating systems. The SNUH PACS is in partial scale operation now, and will be expanded to full scale by the end of 1998.

关键词： Picture Archiving and communication System Image storage Windows NT Radiology Surgery Diagnostics Image resolution optical resolution Computer architecture Telecommunications

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Reference architecture for DICOM-compliant PACS development

Reference architecture for DICOM-compliant PACS development

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conference on PACS Design and Evaluation - Engineering and Clinical issues, at the Medical Imaging 1997 Meeting

作者： Fritz, SL Roys, SR Munjal, S Univ. of Maryland/Baltimore (United States)

ISBN: (纸本)0819424463

DICOM semantics refers to the specification of meaning of DICOM messages exchanged between two DICOM-compliant systems. DICOM-compliant PACS networks may fail to achieve interoperability due to different variations in allowable DICOM semantics used by different implementors. We have specified the beginnings of a DICOM reference architecture by designing a generic PACS network, selecting certain PACS functions commonly implemented in DICOM Application Entities and making explicit assignments of various DICOM service classes to carry out the selected application level functionality. A generic PACS based on the reference architecture presented here is being implemented with the intention off providing Internet access to it for interoperability testing.

关键词： Image storage Picture Archiving and communication System Data storage Data archive systems Image retrieval network architectures Printing Data acquisition Image acquisition Internet

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Personal communications services over HFC CATV networks

Personal communications services over HFC CATV networks

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Proceedings of the 1997 Canadian conference on Electrical and Computer Engineering. CCECE'97. Part 2 (of 2)

作者： Elfeitori, Anwar A. Leung, Victor C.M. Univ of British Columbia Vancouver Canada

We propose a cost effective deployment of Personal communications Services (PCS) over Hybrid Fibre Coaxial (HFC) CATV networks. Our proposal utilizes the emerging IEEE 802.14 network architecture and the Medium Access control (MAC) protocol. This paper presents the proposed network architecture and addresses some PCS mobility issues such Handoff (HO), and Location Registration and Update.

关键词： Personal communication systems

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Open modular architecture controls at GM Powertrain - Technology and implementation

Open modular architecture controls at GM Powertrain - Techno...

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conference on Open architecture control systems and Standards

作者： Bailo, CP Yen, CJ General Motors Powertrain Group (United States)

ISBN: (纸本)0819423149

General Motors Powertrain Group (GMPTG) has been the leader in implementing open, modular architecture controller (OMAC) technologies in its manufacturing applications since 1986. The interest in OMAC has been greatly expanded for the past two years because of the advancement of personal computer technologies and the publishing of the OMAC whitepaper by the U.S. automotive companies stating the requirements of OMAC technologies in automotive applications. The purpose of this paper is to describe the current OMAC projects and the future direction of implementation at GMPTG. An overview of the OMAC project and the definition of the OMAC concept are described first. The rationale of pursuing open technologies is explained from the perspective of GMPTG in lieu of its agile manufacturing strategy. Examples of existing PC-based control applications are listed to demonstrate the extensive commitment to PC-based technologies that has already been put in place. A migration plan from PC-based to OMAC-based systems with the thorough approach of validation are presented next to convey the direction that GMPTG is taking in implementing OMAC technologies. Leveraged technology development projects are described to illustrate the philosophy and approaches toward the development of OMAC technologies at GMPTG. Finally, certain implementation issues are discussed to emphasize efforts that are still required to have successful implementations of OMAC systems.

关键词： OMAC controls PC-based controls open modular control systems CNC PLC I/O network

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Traffic control mechanism to support video multicast over IP networks

Traffic control mechanism to support video multicast over IP...

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IEEE International conference on Multimedia Computing and systems 97

作者： Ramanujan, R Ahamad, A Thurber, K Architecture Technology Corp Minneapolis United States

ISBN: (纸本)0818678194

A major impediment to the development of networked video applications is the lack of adequate support for video multicast within the Internet Protocol (IP). This paper presents an approach for extending the capability of IP to support multicast of video steams in a heterogeneous networking environment where there are static variations in the capacities of the links and the video quality needs of the receivers as well as dynamic variations in the available bandwidth of the network links. The approach, called IP extensions for video multicast (IPEVM), uses an innovative traffic control mechanism within the network routers that dynamically adapts the quality of the video to changes in the available network bandwidth while ensuring fair treatment of all traffic contending for the network's best effort service. It also permits an application-selectable mix of resource reservation and adaptive bandwidth management to be used in building networked video applications.

关键词： Image communication systems

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Performance issues in optically amplified systems and networks

Performance issues in optically amplified systems and networ...

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Proceedings of the 1997 conference on optical Fiber communications

作者： Zyskind, John Bell Lab/Lucent Technologies Holmdel United States

The growth of wavelength-division multiplexed transmission systems and the prospect of multiwavelength optical networking are the most significant consequences of the advent of erbium-doped fiber amplifiers (EDFA). However, EDFAs are not perfect and give effects such as amplifier noise, spectral gain nonuniformity, and channel cross saturation which limit the performance of optically amplified transmission systems and networks. Techniques for dynamic protection of surviving channels, which include fast pump control and laser automatic gain control implanted at each amplifier and link control implemented on a per link basis, are presented. To stabilize the gain of all amplifiers in each link fast electronic feedback circuit or optical feedback is used.

关键词： Fiber optic networks

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