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检索条件"任意字段=Conference on All-Optical Communication Systems: Architecture, Control and Network Issues"

共 2533 条记录，以下是2281-2290 订阅

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Performance analysis of OOK and PPM over wireless channels using PIN-BJT receivers

Performance analysis of OOK and PPM over wireless channels u...

引用

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

作者： Chan, HH Elmirghani, JMH Cryan, RA NORTHUMBRIA UNIV FAC ENGN SCI & TECHNOLDEPT ELECT & ELECT ENGN & PHYSNEWCASTLE TYNE NE1 8STTYNE & WEARENGLAND

ISBN: (纸本)0819423211

This paper considers the design of a common collector common emitter PPM PIN-BJT receiver to achieve a good sensitivity improvement in the indoor infrared wireless communication system. The system operates at a bit rate of 10 Mbit/s and (lambda) equals 0.85 micrometers . The results demonstrate a low noise current for the receiver of about 2.7 pA/ (root)Hz. Original results are presented illustrating the systems to achieve a sensitivity of -50.5 dBm at an error rate of 10^-9 representing an improvement of 9.8 dB over a comparable ON OFF keying PIN-BJT system. The sensitivity enhancement has significant impact on the optical wireless network where the maximum allowed transmitted power is limited by safety issues. Moreover, the use of PPM offers other advantages such as the low average power which is suited for battery operation and a high peak power that aids detection.

关键词： PIN-BJT receiver PPM OOK receiver sensitivity optical wireless network

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Simulation of distortion in multi-carrier subcarrier multiplexed optical communication systems employing direct intensity modulation of semiconductor lasers

Simulation of distortion in multi-carrier subcarrier multipl...

引用

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

作者： Haldar, MK Garg, HK Chia, KB Mendis, FVC NATL UNIV SINGAPORE DEPT ELECT ENGNCOMMUN & MICROWAVES DIVSINGAPORE 119260SINGAPORE

ISBN: (纸本)0819423211

Direct intensity modulation of semiconductor lasers in subcarrier multiplexed (SCM) optical fiber communication systems is of interest because of its simplicity and the possibility of integration of the drive electronics with the laser diode. Direct modulation also produces distortion which degrades system performance. In this paper, we extend a static numerical simulation method for multi-carrier SCM systems to a dynamic simulation employing rate equations. We first show that the results of our simulation agree with analytical results for multi-carrier SCM systems obtained from perturbation theory in the absence of optical reflection into the semiconductor laser. We proceed with the calculation of distortion in the presence of weak reflections. We show that the distortion is lower than what is expected from previous analytical considerations for two subcarriers. Our simulation can also take into account the effect of overmodulation in a dynamic manner. However, our simulation does not take into account the distortion due to device imperfections.

关键词： subcarrier multiplexing intensity modulation semiconductor lasers distortion overmodulation rate equations CATV

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architectures for 100 km 2048 split bidirectional SuperPONs from ACTS-PLANET

Architectures for 100 km 2048 split bidirectional SuperPONs ...

引用

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

作者： vanDeventer, MO Angelopoulos, JD Binsma, JJM Boot, AJ Crahay, P Jaunart, E Peters, PJM Phillips, AJ Qiu, XZ Senior, JM Valvo, M Vandewege, J Vetter, P VandeVoorde, I KPN RES ROYAL PTT NEDERLANDNL-2260 AK LEIDSCHENDAMNETHERLANDS

ISBN: (纸本)0819423211

This paper presents different architectures for high split, wide range bidirectional *** of the ways to achieve such SuperPONs is by the introduction of erbium- doped-fiber-amplifiers or semiconductor optical amplifiers (SOA) in order to overcome the strongly increased power budgets in comparison to conventional PONs. This will however present new challenges in overcoming the 'noise- funneling' effect caused by the parallel amplifiers. Four different approaches are studied: 1) using of on/off switchable semiconductor optical amplifiers, 2) using parallel erbium-doped-fiber amplifiers, 3) using electro- optic regeneration, and 4) using conventional SDH, ATM and APON technology. A description is given of each architecture, including advantages and drawbacks. These architectures serve as input to further studies performed by the ACTS-PLANET consortium. The power-budget studies showed that it is technically feasible to develop a SuperPON with a 2048 split and a 70-100 km range.

关键词： optical fibre passive optical network PON APON SuperPON ACTS-PLANET access network architecture fibre-to-the-home fibre-to-the-curb fibre-to-the-premise

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Frequency chirp in asymmetric Fabry-Perot electroabsorption modulators for use in the local access network

Frequency chirp in asymmetric Fabry-Perot electroabsorption ...

引用

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

作者： Leeson, MS MANCHESTER METROPOLITAN UNIV DEPT ELECT & ELECT ENGNCTR COMMUN NETWORKS RESMANCHESTER M1 5GDLANCSENGLAND

ISBN: (纸本)0819423211

Frequency chirp in modulator devices is of increasing importance at higher bit rates and increased transmission distances. The chirping behavior of reflective, resonant electroabsorptive optical modulators is analyzed and compared to the non-resonant case for a Framz-Keldysh effect based device. The chirp is found to display oscillatory behavior which is explained by the interaction of the electric field induced changes in complex refractive index with the cavity. The effect of a front face reflectivity lower than that for matching is shown to be poorer modulation and chirping performance. If the front face reflectivity is greater than that needed to match then negative chirp is possible but the insertion loss is greater than 8 dB. By fine tuning the length of the device it is shown that this can be reduced to 3 dB producing a contrast ratio of 4.5 dB and -500 MHz chirp for 400 ps, 15V pulses.

关键词： access network reflection modulators frequency chirp Franz-Keldysh Effect

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Software architecture of broadband distribution in the optical CATV network

Software architecture of broadband distribution in the optic...

引用

1996 International conference on communication Technology

作者： Park, AS Lee, KY TMN SW SECTELECT & TELECOMMUN RES INSTYUSONG GUTAEJON 305350SOUTH KOREA

ISBN: (纸本)7505336355

This paper presents the OAM(Operations and Administrations and Maintenance) software architecture of BRDS(BRoadband Distribution Subsystem) for optical CATV network. We built an optical CATV network called SWAN (Socio-cultural Welfare Advanced network) based on SDH (Synchronous Digital Hierarchy) and FTTH (Fiber To The Home) technology. BRDS is one of the SWAN subsystems. The OAM software of BRDS consists of operating systems and application software. In this paper, we describe the technical issues such as implementation aspects, development environment and future plan of OAM software for BRDS.

关键词： Computer software

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communication architectures for centralized monitoring and control of power equipment

Communication architectures for centralized monitoring and c...

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18th Telecommunications Energy conference (INTELEC 96)

作者： Hirsch, M Johnson, M Smith, D Lucent Technologies Mesquite United States

ISBN: (纸本)0780335082

In the past, on-site or roving personnel monitored and repaired power equipment Today, to increase efficiency and reduce costs, there is a trend to monitor equipment from a centralized maintenance location. This location is responsible for monitoring all the equipment sites, responding to alarms, and scheduling service and repair as needed using the most appropriate service personnel. The telecommunications vendor must make many decisions when building the maintenance network. Some of the issues include number of maintenance sites type of central monitoring system type of communication links messaging protocol alarms and data to be processed prioritizing alarms security network and element failure remote operations This paper discusses a general networking architecture and specific architectures using examples drawn from two different working systems: Bellcore's Transaction Language 1 (TL-1) and Telefonica de Espana's Sistema de Operacion y Conservacion (SOC). It also speculates on future architectures based on TCP/IP and SNMP protocols.

关键词： Electric power supplies to apparatus

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Development of the optical fibre network in China

Development of the optical fibre network in China

引用

22nd European conference on optical communication (ECOC 96)

作者： Lin, JT BEIJING UNIV POSTS & TELECOMMUN BEIJING 100088PEOPLES R CHINA

ISBN: (纸本)8242304181

China is experiencing a very rapid phase of development in the optical fibre network. Recent years saw the completion of many long-distance fibre-optic cable trunks, bringing the total length of China's fibre-optic cable to 70 000 km, connecting all the 29 provinces. A fibre-optic cable network with Beijing as the centre has been formed primarily. The successful opening of some 2.4 Gb/s SDH systems in 1995 marked a higher step in the nation's trunk telecommunications technology. To upgrade the basic telecommunications network, the building of the SDH network, CCS No.7 network and monitoring and control network has been accelerated. As a part of CNII (China National Information Infrastructure), a new development of fibre-optic cable network has been planned.

关键词： Fiber optic networks

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Hybrid network management

Hybrid network management

引用

AIAA Dynamics Specialists conference, 1996

作者： Baras, John S. Ball, Mike Karne, Ramesh K. Kelley, Steve Jang, Kap D. Plaisant, Catherine Roussopoulos, Nick Stathatos, Kostas Vakhutinsky, Andrew Valluri, Jaibharat Whitefield, David Center for Satellite and Hybrid & Communication Networks Institute for Systems Research University of Maryland College ParkMD20742 United States 212-7909 United States

We describe our collaborative efforts towards the design and implementation of a next generation integrated network management system for hybrid networks (INMS/HN). We describe the overall software architecture of the system at its current stage of development. This network management system is specifically designed to address issues relevant for complex heterogeneous networks consisting of seamlessly interoperable terrestrial and satellite networks. network management systems are a key element for interoperability in such networks. We describe the integration of configuration management and performance management. The next step in this integration is fault management. In particular we describe the object model, issues of the Graphical User Interface (GUI), browsing tools and performance data graphical widget displays, management information database (MIB) organization issues. Several components of the system are being commercialized by Hughes network systems. © 1995 by the American Institute of Aeronautics and Astronautics, Inc. all rights reserved.

关键词： network management

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network control and management of a reconfigurable WDM network

Network control and management of a reconfigurable WDM netwo...

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Proceedings of the 1996 15th Annual Military communications conference, MILCOM 96. Part 3 (of 3)

作者： Wei, John Y. Shen, Chien-Chung Wilson, Brian J. Post, Michael J. Navesink Research and Engineering Cent Red Bank United States

This paper describes a set of software and experiments to demonstrate network control and management capabilities for a reconfigurable wavelength-division-multiplexing (WDM) all-optical network. This work is an early prototype implemented in the first year of the DARPA Multiwavelength optical networking (MONET) Project. The primary goal of the prototype experiment work was to demonstrate and assess the viability of implementing a WDM network's control and management (NC&M) system over a Common Object Request Broker architecture (CORBA) compliant[1] reliable distributed platform. Another goal was to demonstrate the viability of using an embedded optical wavelength to support the NC&M system's data communication channels. This early prototype allows us to gain experience and to lay the foundation for our on-going work to develop the full-featured NC&M system in the MONET project's testbed and field trial experiments. This is an important step towards realizing the overall vision of the MONET project in the development of a flexible, reliable, high-capacity, high-performance cost-effective national optical network based on multi-wavelength fiber-optic technology.

关键词： Fiber optic networks

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Performance evaluation of the OLVP (OnLine video processing) system

Performance evaluation of the OLVP (OnLine video processing)...

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20th Annual International Computer Software and Applications conference (COMPSAC 96)

作者： Andres, F Ihara, K Boulos, J Ono, KJ Yasuda, Y NACSIS Japan

ISBN: (纸本)0818675799

This paper discusses how the OLVP system, a novative Video-on-Demand system, can be used to efficiently support video delivery applications over Asynchronous Transfer Mode (ATM) network. We show how the OLVP system's offbeat on key issues in video on demand system provided high Quality of Service(QoS) to video applications executing over a set of distributed, and heterogeneous system resources. System architecture is described. Key functionality, including distributed video storage management, real-time admission control strategy and resource allocation routing mechanism, traffic management and routing algorithms (both in the ATM network and in the OLVP system) are investigated. To illustrate the success of our approach, we provide a performance evaluation based on simulations of the system.

关键词： Image communication systems

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