WDM全光网络的故障定位

故障定位对于波分复用（WDM）全光网络的保护非常重要，文章给出了一种简洁有效的基于因果链和集合论的故障定位方法，并详细分析了故障模型，证明了用于故障定位的公式，进行了算法的时间和空间复杂性分析，还给出了实际设备的告警和故障的详细描述。     

光网络中的分布式故障定位方法

提出一种用于全光网络中的故障定位方法，该方法克服了以往的故障定位方法需要告警上报和传递、故障定位时间长和适用范围有限的缺点，采用单节点分布式故障定位方法，避免了告警信息在节点之间的传递，能够实现快速准确的故障定位，并且适用于任何规模和拓扑结构的网络。     

WDM系统日常维护及故障处理

目前,波分复用(WDM)系统已被广泛应用,因此,对波分复用设备的维护就显得非常重要.文章针对波分复用设备的各单元,结合作者实际工作中的经验,对维护的要点进行了阐述,同时,介绍了实际工作中常用的波分复用系统故障处理方法.     

传输网络的分层故障定位法

文章提出一种用于通信的故障定位方法,该方法克服了传统的故障定位方法适用范围窄和实现复杂的缺陷.采用分层的故障定位方法,同时采用逻辑分析和归纳的方法,可以把复杂的故障定位问题转化为一个个容易处理的子问题.此外,在各个层面还给网管人员留有修改和加载的权限,不仅实现灵活,而且适用性强.该方法已申报国家发明专利,并用于实际系统中.     

新型IP over WDM网络结构应用研究

在最近几年里，波分复用技术(WDM)的巨大进展促进了基于WDM网络的研究。直到最近,WDM主要还是用于点到点的长距离传输，然而，随着WDM联网技术的出现，IP over WDM技术将会占据主导地位。为此提出了一种新型混合模型网络结构，并进行了模拟仿真研究，结果表明此技术是可行的。     

网状WDM网络的抗毁设计

本文使用整数线性规划法对多光纤网状WDM网络进行抗毁设计,使用的保护策略为共享通道保护和共享链路保护,网络设计的优化目标是使全网铺设的光纤总长度最短。然后以类CERNET为例,求解出不同保护策略下网络需要的光纤总长度,并分析了它们各自的特点以及波长转换对目标函数值的影响。     

WDM光网络的研究进展

波分复用技术（WDM）在主干传送网应用越来越普遍,WDM网络技术的研究也获得了迅速发展,综述了当前主干WDM网络的最新研究进展和发展趋势。     

基于WDM技术的未来光传输网络

讨论了光技术的潜在用途并确定它们在基础传输网功能中的基本任务。实践证明,光层的引入不仅在传输能力和路由节点的吞吐量上同时带来巨大飞跃,而且允许不同信号格式和协议的有效融合。文章给出了大容量WDM系统的传输能力,讨论了光纤放大器和非线性效应的影响最后阐述了实现可靠通信所需的技术,论述了光网络保护的策略。     

WDM网络中波长转换的理论研究

波分复用WDM(Wavelength Division Multiplexing)网络由于具有超大容量传输、节省光纤资源、平滑升级扩容等优点,因此被认为是未来骨干网的发展方向。波长资源是影响WDM网络性能的主要因素,而波长转换算法是解决网络资源合理配置和提高网络运行效率的重要途径,所以研究波长转换问题具有十分重要的意义。本文首先简要介绍了WDM网络的发展情况和研究波长转换算法的重要意义,接着总结前人在波长转换算法上的研究成果,然后结合前人理论成果,提出关于波长转换问题的两条定理并给出详细证明,最后对全文进行总结并确定下一步研究方向。     

WDM光网络中的业务量疏导

波分复用（WDM）技术在主干传送网中巳广泛应用，WDM光网络的研究进展也非常迅速，光网络中的业务量疏导定义为复用、解复用和交换低速率业务流到大容量的光路中的行为。介绍了WDM光网络的业务量疏导的重要性，研究方法及其最新研究进展情况。     

Fault Localization at the WDM Layer

A single failure in a communication network may trigger many alarms. When the communication network uses optical fibers as transmission medium and increases its capacity by using Wavelength Division Multiplexing (WDM), the number of alarms and the difficulty to locate the failure are considerably higher. In this case, a single failure may interrupt several channels which causes a large information loss. We propose an Alarm Filtering Algorithm (AFA) for the fault management of an optical network that supports multiple failures and works in the presence of non-alarming elements, that is, network components which may fail but never generate an alarm (e.g. optical fibers). The algorithm provides a list of components whose failure explain the observed alarms. It avoids the use of failure probabilities, which are difficult to estimate, and does not need a global knowledge of the network topology. Moreover it also tolerates alarm losses and false alarms. The algorithm is tailored to the specific behavior of the hardware components of an optical network when a failure occurs. The classification of the network components according to the alarm signals they generate enables a formalization of the alarm-filtering problem and results in an efficient algorithm for localizing the failure(s). This algorithm is applied to the WDM rings of the COBNET network [1] (COBNET is a European ACTS project) and to a meshed optical network with the ARPA2 topology.     

WDM光网络的恢复技术

文章介绍了光网络的生存技术，并重点介绍了Mesh网络中的恢复技术，分析了恢复技术的特点，策略，各种路由和波长分配算法选择，并进行了性能比较，同时给出了恢复的时间分析。     

IP over WDM的演进之路

Internet流量的指数级增长和波分复用(WDM)在传送网中的主导地位，使得直接利用WDM技术承载IP业务的IP over WDM光网络成为理想的选择．通过对其三个发展阶段的介绍和分析，文章旨在探讨IP over WDM光网络的演进思路．     

WDM技术在CATV网中的应用前景

分析了我国广播有线电视的现状，系统地介绍了波分复用的概念、工作原理和技术特点，探讨了波分复用技术在广播有线电视领域中的应用和发展前景。     

A Novel Dynamic Fault Restoration Mechanism Using a Multiple Ring Approach in WDM Mesh Networks

This work describes a distributed fault restoration algorithm, called the Dynamic Multiple Ring Algorithm (DMRA), for application in WDM mesh networks. This study explores the choice of restoration paths and the assignment of fault-tolerant bandwidth when a link, node, or channel failure occurs according to the change in traffic load, number of nodes, and transmission delay including propagation and switching delays. Accordingly, the primary aim of this work is to use networking segments near faults to share the restoration load throughout a mesh network. Each node searches for restoration paths in their near environment using the proposed DMRA. Nodes use distributed control to search for neighboring nodes and to establish the relationship between them to build numerous logical rings. Nodes can also locate faults in the logical rings. These rings establish the restoration paths. The traffic load over failed links or nodes can be diverted to other paths in the networking segments. The cost of the restoration paths is computed at each node based on both the current capacity and the transmission delay. The selected restoration paths are suitable transmission routes in the network neighborhood. Hence, restoration paths can be identified and wavelength assigned quickly according to network bandwidth and traffic load. Simulation results reveal that the proposed method works extremely quickly and has a high success rate. Consequently, it is very useful for applications in real WDM networks, where the status varies from minute to minute.Corresponding author is presently a guest scientist with the National Institute of Standards and Technology, USA. This research was partially supported by the Grant of National Science Council, ROC (NSC-92-2218-E-155-004 and NSC-93-2917-I-155-001).     

IP over WDM在干线传送网中的应用

介绍IP over WDM技术及其在干线传送网中的建设应用情况,阐述了IP over WDM的发展趋势.     

基于WDM技术的宽带无源光网络

为了进一步满足接入网增加带宽的需求,同时考虑到WDM器件的局限性,提出了一种基于WDM与现行的功率分束无源光网络（PS－PON）技术的新型光纤接入网络结构,并设计了IP数据报在PON中传送具体优化实施方案。     

WDM环形网络的保护

详细讨论了WDM环形网络中保护我条件的检测和撤消,保护倒换的协调以及故障条件的恢复检测问题,并得出了一些重要的结论,最后我们建议使用自动保护倒换（APS）协议来实现网络的有效保护。