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WDM全光传送网生存性的研究
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摘要
随着通信容量的增加和现代社会对通信依赖性的增强,光网络的生存性问
    题越来越突出。光层保护恢复具有保护速度快、可靠性高、成本低、透明性强、
    可为各种业务提供一个公共生存平台的特点,因而成为研究的热点问题。然而由
    于全光传送网处理的是光信号,以具有模拟特征的波长为单位,使得全光传送网
    的生存性技术与比较成熟的 SDH 生存性技术相比,有了许多新的特点,有许多
    问题期待解决。本文的研究重点是有成本效益的光层保护方案与关键技术以及工
    作通道与保护通道的路由与波长分配问题。
    本文首先分析了当前对光传送网生存性研究的现状和前人所做的主要工
    作。然后对网络生存性的概念、光传送网的分层及节点结构以及光传送网生存性
    的基本技术进行了总结,为以后各章节的讨论提供了理论基础。随后研究了光层
    保护的网络故障监测、倒换判椐、故障定位、倒换协调、保护倒换时间等问题,
    提出了主通道光功率监测、备用通道背向散射曲线监测的故障监测方法。本文还
    针对网络最大故障源—光缆故障,设计完成了一个光层复用段保护系统,给出了
    详细的软、硬件结构、通信协议及测试结果。该系统已通过天津市科委组织的技
    术鉴定,并荣获市科技进步二等奖。
    对网状光网络工作通道和保护通道路由与波长分配算法的研究是本文的另
    一重点。文中从提高网络生存性角度出发,对链路不相关算法进行了改进,提出
    了一个新的路由波长分配算法—光纤物理路由最大不相关算法。文中给出了各种
    保护机制下的 ILP 描述与启发式算法,并给出了范例。最后给出了算法实现的计
    算机仿真软件。分析表明,光纤物理路由最大不相关算法避免了光缆阻断、通信
    管道塌陷等恶性事故引起的工作通道与保护通道同时失效的情况,减少了保护失
    效概率。
With the increase of communication capacity and modern society’s dependence
    on communication, survivability of optical network has become a crucial problem.
    Optical layer protection has characteristic of fast protection rate, high reliability, low
    cost and transparent, it can provide a common survivable platform for all kinds of
    traffic. However, survivable technology in all transport network (OTN) is different
    from SDH because the former handle optical signal and the latter handle electrical
    signal. A lot of problem of survivability in OTN need to be solved. The cost-effective
    survivable scheme in OTN and key technology, primary path and protection path
    routing and wavelength assignment (RWA) are the topics in this thesis.
     First, an analysis of present research situation was given in chapter 1. Second, a
    summary of the relating concepts and technology of optical network survivability was
    given in chapter 2, which is the fundamental for farther discussion. Thirdly, some key
    technologies of optical layer protection such as fault monitoring, location, switching
    corporation, protection switching time were studied in chapter 3, a method of optical
    power monitoring for primary path and OTDR monitoring for protection path was
    provided. Then an OMS protection scheme was designed and realized in chapter 4.
    This paper describers the technical scheme, hardware, software and experimental
    result of the system. The result shows the system is safe and efficient to the protection
    of the transport network.
     Another topic of this paper is RWA algorithms of primary path and protection
    path. In order to improve survivability of optical network, a new routing and
    wavelength assignment algorithms -diverse fiber physical routing algorithms is
    presented. This paper presents the idea, Integer Linear Programs (ILP) and heuristic
    algorithms, simulation model and example. The result shows that diverse fiber
    physical routing algorithm is help to avoid protection fail because optical cable cut or
    communication duct dent, so it can decrease protection fail probability.
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