共查询到19条相似文献,搜索用时 62 毫秒
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杨璐 《计算机光盘软件与应用》2011,(13)
本文在现代光通信的基础上,主要对DWDM技术的基本原理、关键技术、特点和影响因素做一个全面的论述。同时结合实际的工程应用,进一步论证了这种技术的广泛应用前景,最后论述了下一代密集波分复用(DWDM)系统的发展趋势和面临的问题。 相似文献
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谢次琳 《数字社区&智能家居》2007,(10):117-120
随着通信技术的发展,对全光网络的发展需要越来越迫切。光分插复用技术是实现全光网络的关键技术之一。重点介绍了光网络中分插复用技术的基本原理、具体实现方案和结构组成,并结合其研究进展简要分析了光网络中分插复用技术的发展趋势和应用前景。 相似文献
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基于WDM的全光网结构与应用技术 总被引:1,自引:1,他引:0
鄂大伟 《计算机工程与设计》2001,22(6):83-88
介绍了基于波分复用(WDM)的全光网的概念、光交换技术及特点,讨论了WDM全光网的网络结构及关键部件,并给出一个基于WDM技术的ATM光交换机结构。 相似文献
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蔡济远 《计算机光盘软件与应用》2013,(13):128+130
近年来,随着我国光纤通信技术的不断发展以及网络规模的日益扩大,广电网络运营商的基础网络资源受到了越来越大的挑战,在此背景之下,要想实现广电网络的持续稳定发展,扩容改造是最重要最关键的出路。波分复用技术是一种新型的技术,因其所具有的特点与优势,目前已在通信网络中得到了较为广泛的应用。鉴于此,本文拟从波分复用技术概述、波分复用的关键技术以及波分复用技术在广电网络扩容改造中的应用等几个方面来进行分析与阐述,以期加深对这一问题的认识与理解程度。 相似文献
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由于英特网和各种新兴服务业的推动,全球通讯容量正在经历快速增长,并促使光纤技术达到更大的容量,更高的可靠性和更经济的解决方案。掺铒光纤放大器(EDFA)和密集波分复用(DWDM)技术已相当成熟,并已被证明能成功地满足未来容量的需求。与此同时,技术的进步也降低高容量系统的成本,在过去40年,传输容量已增长了4个数量级,而每线路成本也已减少了一万多倍。 相似文献
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全光网是未来宽带网的发展目标,它是针对目前通信网中所存在的电子瓶颈效应而提出的。文中首先介绍了全光网的概念及其网络结构,全光网的优点以及全光网可提供的业务,然后介绍了全光通信网的关键技术及其目前的进展状况。 相似文献
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An efficient scheme of wavelength reuse is presented for solving the capacity limitation of WDM star single-hop networks by limited wavelengths. According to this scheme, the nodes supported by the network can be at least doubled under limited wavelength numbers. Under the same number of nodes, the delay of network can be greatly lowered, the throughput of the network can be increased 1-3 times, and the properties of the network can be efficiently improved. 相似文献
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Hypercube is one of the most versatile and efficient communication patterns shared by a large number of computational problems. As the number of edges in hypercube grows logarithmically with the size of networks, the complexity of network topologies can be significantly reduced to realize hypercube in optical networks by taking advantage of the parallel transmission characteristic of optical fibers. In this paper, we study the routing and wavelength assignment for realizing hypercube on WDM optical networks including linear arrays and rings with the consideration of communication directions. Specifically, we analyze this problem for both bidirectional and unidirectional hypercubes. For each case, we identify a lower bound on the number of wavelengths required, and design the embedding scheme and wavelength assignment algorithm that uses a provably near-optimal number of wavelengths. In addition, we extend the results to meshes and tori. By our embedding schemes, many algorithms, originally designed based on hypercubes, can be applied to optical networks, and the wavelength requirements can be easily derived using our obtained results. 相似文献
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This paper proposes a polynomial-time algorithm for Minimum WDM/SONET Add/Drop Multiplexer Problem (MADM) on WDM directed fiber trees whether or not wavelength converters axe used.It runs in time O(m^2n),where n and m are the number of nodes of the tree andthe number of the requests respectively.Incorporating T.Erlebach et al.‘s work into the proposed algorithm,it also reaches the lower bound of the required wavelengths with greedy algorithms for the case without wavelength converters.Combined with some previous work,the algorithm reduces the number of required wavelengths greatly while using minimal number of ADMs for the case with limited wavelength converters.The experimental results show the minimal number of required ADMs on WDM directed fiber trees. 相似文献
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Steven Chamberland Author Vitae 《Computers & Electrical Engineering》2004,30(5):383-401
In this paper, we tackle the joint link dimensioning and routing metric assignment problem for reliable wavelength division multiplexing (WDM) networks. This design problem consists to find the number of wavelength channels on each link and the routing metrics (considering shortest-path routing) that ensure the routing of all virtual wavelength paths (VWPs) and the successful rerouting of the reliable VWPs for all failure scenarios of interest to the network planner. A mixed integer mathematical programming model is proposed for the problem. The model is adapted for the single link failure scenarios. Since the problem is NP-hard, we propose a tabu search algorithm to obtain good approximate solutions for real-size instances of the problem. Finally, a lower bound is proposed and numerical results are presented and analyzed. 相似文献
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This paper proposes a dynamic RWA scheme using fuzzy logic control on IP/GMPLS over WDM networks to achieve the best quality of network transmission. The proposed algorithm dynamically allocates network resources and reserves partial bandwidth based on the current network status, which includes the request bandwidth, average utilization for each wavelength and its coefficient of variance (C.V.) of data traffic, to determine whether the connection can be set up. Five fuzzy sets for request bandwidth, average rate and C.V. of data traffic are used to divide the variable space: very large (LP), large (SP), normal (ZE), small (SN), and very small (LN). Setting the fuzzy limit is a key part in the proposed algorithm. The simulation of scenarios in this paper has two steps. In the first step, the adaptive fuzzy limits are evaluated based on average transmission cost pertaining to ten network statuses. The second step is to compare the proposed algorithm with periodic measurement of traffic (PMT) in ATM networks in six network situations to show that the proposed FC-RWA algorithm can provide better network transmission. 相似文献
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In this paper, we address the global problem of designing reliable wavelength division multiplexing (WDM) networks including the traffic grooming. This global problem consists in finding the number of optical fibers between each pair of optical nodes, finding the configuration of each node with respect to transponders, finding the virtual topology (i.e., the set of lightpaths), routing the lightpaths, grooming the traffic (i.e, grouping the connections and routing them over the lightpaths) and, finally, assigning wavelengths to the lightpaths. Instead of partitioning the problem into subproblems and solving them successively, we propose a mathematical programming model that addresses it as a whole. Numerical results are presented and analyzed. 相似文献
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在全光网络中,光信号在全光域内传输,避免了光-电转换带来的延迟,因此,全光网支持高数据率传输并提供巨大的网络容量。WDM(波分多路复用)技术的采用使得高速光传输线路与低速终端处理设备之间能够相互兼容。论文探讨了WDM全光网中的路由及波长分配问题,对各种常用算法进行了详细的分析,并提出了对一种新型的用于WDM网络上的实时组播请求的分布式RWA算法进行改进的意见。 相似文献