排序方式: 共有23条查询结果,搜索用时 0 毫秒
11.
In this paper, a new architecture of optical networks -- the optical network based on server system is considered. From the point of this new architecture, the network can be modeled as a server system with three type servers -- the access server, the node server and the link server. The network performances such as cost, energy consume and network capacity can be affected by the capability of these three type servers. New ILP formulations are proposed to analyze the network capacity under two types of node severs, with and without wavelength converter. Computer simulations are conducted to evaluate the effectiveness of these new formulations. The study has shown that the network can achieve the same throughput under the two types of node servers and the network throughput increases when the maximum allowed variation increases. 相似文献
12.
13.
污秽闪络是威胁电力系统安全的主要因素之一,为了预防污闪事故的发生,需要定期对绝缘子表面的污秽度进行检测,但传统的停电取样检测周期长,耗费大量人力物力。文中提出一种利用激光诱导击穿光谱(LIBS)技术对绝缘子表面污秽度进行分析的方法。以10个带有不同等值盐密、等值灰密的自然污秽玻璃绝缘子为主要研究对象,将其上表面分为内、中、外环3个区域,研究不同测试策略下定标模型的相关系数,采用Na 589.592 nm、Al 396.192 nm作为特征谱线,发现对于盐密的检测定标模型,采用内、中环联合区域的测试策略,相关系数可达0.948 1,检测相对误差在5%以内;对于灰密的检测定标模型,采用中环独立区域的测试策略,相关系数可达0.938 3,检测相对误差在15%以内。该分析手段能实现现场快速分析绝缘子表面污秽度,提升输电线路运行安全维护作业能力,具有重要的工程应用价值。 相似文献
14.
15.
WDM全光通信网技术及其发展 总被引:1,自引:0,他引:1
在IP业务的高速增长和WDM技术提供超大容量带宽资源的双重刺激下,传统光网络正在朝着适于传输IP业务的新一代光网络演进。本文描述了WDM光传送网的发展与现状,讨论了基于OXC和OADM的WDM光传送网技术,并对下一代光网络的发展进行了分析和展望。 相似文献
16.
光网络中引入全光交换技术可以无需进行光电光转换和电信号处理,使网络具备透明性,大大降低节点的复杂性和节点成本。多粒度交换节点减小了交换矩阵的规模,降低了交换矩阵的复杂性,是波分复用(WDM)网络节点发展的一个方向。随着正交频分复用(OFDM)技术的引入,带宽可变的节点技术得到了越来越广泛的关注。文章介绍了传统的基于波长的光交叉连接器(OXC)交换结构、多粒度交换结构,以及基于正交频分复用/单载波频分复用(OFDM/SCFDM)的节点交换结构,并通过实验对基于带宽可变的可重构的光分插复用器(ROADM)、OXC节点技术进行了验证。在实验中提出的基于子波带的交换结构中,节点容量达到了P比特量级。 相似文献
17.
18.
In Elastic Optical Networks(EONs)with flexible bandwidth allocation,the blocking probability is high because of spectral contention.Similar to the functionality of wavelength conversion in Wavelength-Division-Multiplexing(WDM)networks,waveband conversion has been proposed to solve spectral contention in EONs.In this paper,we discuss the design of node architectures for an EON with waveband conversion.Four node architectures with shared Tuneable Waveband Converters(TWBCs)are proposed,and their blocking performances are evaluated by simulation.Simulation results show that the blocking probability of a node is significantly improved by waveband conversion.The sharing efficiency of waveband converters is also investigated.Simulation results show that at the same blocking rate,the node architecture with converters shared per node can save more than 20% waveband converters compared with that of the one with converters shared per link. 相似文献
19.
In order to decrease the blocking probability of fast light-path set-up in the network, a novel strategy for optical flow switching is proposed, named dynamically initialized wavelength number protocol (DIWP), which can dynamically change the initialized wavelength number according to the traffic load of the network. Computer simulations are conducted to analyze the performance of the proposed strategy, which is based on forward reservation backward release (FRBR) mechanism. The results show that the initialized wavelength number can affect the blocking probability of the network. 相似文献
20.
短距离光纤传输系统的容量扩展受到越来越广泛的关注。空分复用光传输技术提供了纤芯和模式两个新维度,可以大大提升单根光纤的传输容量。然而空间信道间的串扰严重限制了空分复用技术的实用化。首先研究了弱耦合空分复用光纤,通过在纤芯引入环形折射率微扰的方法实现了模式之间的有效分离;其次,提出了一种可以处理非圆对称简并模式的全光纤复用/解复用器件以及低插损、低串扰扇入扇出器;在此基础上,使用低成本商用强度调制直接检测光模块,实现了短距离弱耦合模分复用及多芯少模复用实时光传输;最后对空分复用实时光传输技术进行了展望。 相似文献