共查询到20条相似文献,搜索用时 140 毫秒
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文章对光缆自动监测系统的技术原理、系统结构以及技术应用前景进行了分析。光缆自动监测系统可实现远程、实时、在线/备纤自动监测,可进行点名测试、实时监测、周期测试和告警测试的功能。系统可广泛适用于长途干线和本地光纤网络的集中运行维护工作中。 相似文献
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吴聪华 《光纤与电缆及其应用技术》2004,(6):24-26
近几年来光缆在电力系统的应用越来越普及,电力系统的通信、自动化、维护等越来越依赖高可靠、高性能的光纤传输。但在实际应用中,由于受外力及光缆本身质量等因素影响,光缆很容易遭到破坏,从而影响光缆的传输质量。光缆在线监测系统能在光缆遭到破坏时迅速确定光缆的故障点,为光缆故障修复提供宝贵的时间。 相似文献
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Yueping Cai Motoharu Matsuura Eiji Oki Naoto Kishi Tetsuya Miki 《Photonic Network Communications》2010,20(3):293-302
This article presents a resilient star-ring optical broadcast-and-select network with a centralized multi-carrier light source
(C-MCLS). It consists of a star part network and a ring part network. Optical carriers generated by the C-MCLS are broadcast
to all network nodes, which select and utilize them for data transmission. Optical carrier distribution as well as data transmission
and receiving are performed in the star part network. The ring part network is for fiber failure recovery. The network resilience
property enables the design of a fast distributed failure recovery scheme to deal with single and multiple fiber failures.
We introduce a fiber connection automatic protection switching (FC-APS) architecture that only consists of optical couplers
and 1 × 2 optical switches for each network node. Based on the FC-APS architecture, we design a distributed failure recovery
scheme to recover the carriers and data affected by fiber failures. The fiber failure detection and failure recovery operations
are performed by each network node independently only using its local information. We evaluate the recovery time of the distributed
failure recovery scheme compared with that of the centralized one. Numerical results show that the distributed scheme greatly
reduces the recovery time compared to the centralized configuration in the recoveries of both single and multiple fiber failures.
Optical power loss analysis and compensation of the recovery routes in the distributed scheme are also presented. We show
the required number of optical amplifiers for the longest recovery route in the distributed scheme under different numbers
of network nodes and fiber span lengths. 相似文献
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WANG Jian ZHANG Min YE Pei-da LI Qing Beijing University of Posts Telecommunications Beijing P.R. China. 《中国邮电高校学报(英文版)》2004,11(2)
1 Introduction ThefastgrowthofIP baseddata ,especiallythosevariousemergingmultimediaapplications,demandmoreandmorebandwidthontheInternet,andre sultintheadventandmaturityofWavelengthDivi sionMultiplexing (WDM )systems[1~3] whichen abletheexploitationofthehugepotentialbandwidthofopticalfibers. MuchresearchefforthasbeenfocusedonIP over WDMnetworkingmodelstobuildthenextgenera tionopticalInternet,whereIPpacketsaresupport eddirectlybytheopticallayerbyeliminatingtheATMswitchinglayerandSD… 相似文献
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Tan Wei Zhang Zhizhong Luo Yunhan Wang Sheng Li Lemin 《电子科学学刊(英文版)》2006,23(5):656-660
A new scheduling algorithm, which aims to provide proportional and controllable QoS (Quality of Service) in terms of burst loss probability for OBS (Optical Burst Switching) networks, is proposed on the basis of a survey of QoS schemes in current OBS networks. With simulations, performance analysis and comparisons are carried out in detail. The results show that, in the proposed scheme, burst loss probabilities are proportional to the given factors and the control of QoS performance can be achieved with better performance. This scheme will be beneficial to the OBS network management and the tariffpolicy making. 相似文献
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EPON技术及组网应用研究 总被引:1,自引:0,他引:1
基于以太网技术的无源光网络(EPON)技术发展迅速,但EPON的组网和应用还存在一些问题。文章结合电信业务需求分布的实际特点,研究并提出了EPON的组网原则和组网方案选择,包括光线路终端布放原则、分光器布放原则、光网络单元布放原则、组网选择。通过EPON方式组网,可有效节省电信运营商的建设成本和投资成本,且具有很好的可扩展性。 相似文献
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Existing Ethernet Passive Optical Network (EPON) Dynamic Bandwidth Allocation (DBA) algorithms suffer from the disadvantage of idle time loss, which lower the upstream bandwidth utilization. This letter proposes an improved upstream transmission scheme with idle-time eliminating mechanism. Theoretical analysis and numerical calculation prove that the improved scheme can effectively eliminate the idle time and enhance the efficiency of upstream link utilization. Simulation results have shown that the bandwidth utilization can be raised up to 15% in heavy-load scenarios while the time delay performance of Assured Forwarding (AF) and Best Effort (BE) services are improved simultaneously. 相似文献
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EPON(Ethernet over Passive Optical Network,以太无源光网络)是一种新型的光纤接入网技术,它采用点到多点结构、无源光网络传输,在以太网之上提供多种业务。主要研究EPON网络系统的设计和实现,以及EPON的网络结构特点,通过逻辑分析与实证相结合的办法,论述了EPON网的设计过程,得出了不同接入需求下的设计方案。创新之处在于从用户带宽需求入手实现资源配置最优的效果。 相似文献
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自同步在OTDM(光时分复用)分组网络中占有十分重要的地位,为此提出了一种简单的基于太赫兹光学非对称解复用器(TOAD)的自同步方案,给出了理论模型并进行了数值仿真,最后分析了SOA(半导体光放大器)饱和能量对该方案性能的影响。 相似文献
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光突发交换(OBS)是实现IP/DWDM网络的一种极有前途的方案。该文着重讨论了光空发交换(OBS)网络中单向资源预留的方式。文中首先介绍了著名的JET(Just Enough Time),提出了一种新的单项资源预留方式 Just Little Time (JLT),它不但能使用偏转路由,还能有效利用Fiter Detag Line(FDL)延时来弥补偏移时间的不足,只需使用很小的初始偏移时间,降低了数据在网络中的延时。随后,文章讨论了使用偏移时间增量来实现区分服务的方法。计算机仿真结果证明了所提方法的有效性。 相似文献