城域波分--新一代传送网络的基础

1城域波分的概念 城域波分是密集型波分复用系统在城域范围内的具体运用.城域波分的拓扑结构可以是环、链或其他类型,目前实际采用的主要是2纤OADM环网,单方向传输的波长通路数量一般为16或32/路,单波长承载信号速率一般为2.5 Gbit/s或10 Gbit/s,环网长度一般不超过250 km.     

中兴ZXMP M800数据业务解决方案及其应用

采用以城域OADM技术构建的传送平台正逐步取代传统的传输网。以OADM技术构建的ZXMPM800城域密集波分设备为电信运营商构建各种规模的本地网和城域核心网络提供了理想的解决方案。     

中兴通讯城域光传送技术

本文首先介绍城域光传送网的建设思路，然后分别介绍了中兴通讯对基于SDH的MSTP、基于OADM的城域传送节点的解决方案和技术特性，最后简要阐述了中兴通讯对未来城域智能光网络的一些观点。     

城域波分复用传输系统

随着城域传输网的演变和对带宽的要求，密集波分复用技术将由长途骨干网进入城域传输网。本文对城域DWDM系统的组成、波长的采用、OADM结构、波长转换器特性、光放大器的采用、波长优化、网络保护机制等进行了简要的分析。     

WDM光网络中OADM的矩阵理论

该文用矢量和矩阵等数学工具对光网络中的OADM(Optical add-drop multiplexer)节点进行了全面的系统的理论分析,提出了一种新的OADM分析模型,并应用这种模型对光网络上传输的信号进行了详细的分析推导,得到了OADM环网中信号串扰的普适公式,为OADM及全光网的设计和分析提供了一种新的方法。     

城域光传送网

描述了城域光传送网的3种主要技术——城域WDM环网、以SDH为基础的多业务传送平台、弹性分组环（RPR）的特点和应用，并简略阐述了近期城域光送网的建设思路和发展趋势。     

城域WDM环网及其应用

文章阐述了城域WDM环网的节点结构，保护方式，波长转换器，子速率复用和光网络管理等，给出了WDM环网在城域应用时应考虑的一些因素，并分析了运营商所关心的系统成本问题。     

浅析城域网的发展与技术选择

本文结合城域网的基本概念，介绍了城域光传送网的3种主要技术：城域WDM环网、以SDH为基础的多业务传送平台（MSTP）、弹性分组环（RPR），阐述了城域网的建设和发展。[编者按]     

建设新一代城域网

在传统WDMSDH基础上建设城域传输网，由于其自身的限制，造成带宽利用率较低、网络层次复杂、接口单一等问题，不能很好满足现代的通信需求，随着技术的发展，出现了OADM、MSTP等基于传统技术改进的技术和产品，本着重从这两方面介绍了建设新一代城域传输网的技术。     

中兴通讯承建香港九仓电讯城域骨干网工程

近日,香港九仓电讯采用中兴通讯Unitrans系列OADM和MSTP产品建设的新骨干光网络顺利通过终验。这是亚太地区为数极少的开通运营的城域OADM和MSTP工程,业界专家认为网络在总体技术水平上已居于国际最先进行列。本次光网络基于ZXMPM800OADM和ZXMPMSTP系统,在城域光网络上除集成了传统的语音服务外,还提供数据传输、网络管理、网络视频应用、国际专线、数据专网多媒体传输等多种服务。新网络的带宽最高可达400Gbit/s,在现有光纤上可提供更丰富的业务、更高的可靠性和弹性。这标志着中兴通讯OADM、MSTP系列光传输产品的高质量…     

单双向OADM节点混合时的光环形网的保护

简单介绍了光环形网的几类保护形式和典型的单双向OADM结构，并进一步分析了单双向节点构成的混合环网的线路保护和通道保护以及双向节点的混合保护，还对节点的综合控制作了简单分析。     

Cost-effective traffic grooming in WDM rings

We provide network designs for optical add-drop wavelength-division-multiplexed (OADM) rings that minimize overall network cost, rather than just the number of wavelengths needed. The network cost includes the cost of the transceivers required at the nodes as well as the number of wavelengths. The transceiver cost includes the cost of terminating equipment as well as higher-layer electronic processing equipment, which in practice can dominate over the cost of the number of wavelengths in the network. The networks support dynamic (i.e., time-varying) traffic streams that are at lower rates (e.g., OC-3, 155 Mb/s) than the lightpath capacities (e.g., OC-48, 2.5 Gb/s). A simple OADM ring is the point-to-point ring, where traffic is transported on WDM links optically, but switched through nodes electronically. Although the network is efficient in using link bandwidth, it has high electronic and opto-electronic processing costs. Two OADM ring networks are given that have similar performance but are less expensive. Two other OADM ring networks are considered that are nonblocking, where one has a wide-sense nonblocking property and the other has a rearrangeably nonblocking property. All the networks are compared using the cost criteria of number of wavelengths and number of transceivers     

A comparison of the homodyne crosstalk characteristics of opticaladd-drop multiplexers

We compare the homodyne crosstalk characteristics of a number of different optical add-drop multiplexer (OADM) structures, in the context of wavelength-division multiplexed (WDM) ring or bus network links. Nine fixed-wavelength and rive reconfigurable OADM structures are examined. For the fixed-wavelength structures, we find considerable variation in the levels of incoherent crosstalk, and generally low coherent crosstalk levels. For the reconfigurable structures, incoherent crosstalk levels are quite similar, but the coherent crosstalk levels differ considerably. The range of homodyne crosstalk-induced power penalties is calculated for all structures, and the probability distribution is found for each reconfigurable OADM. The effects of the number of OADMs in the link and the number of wavelength channels in the network are also studied. We find that the best choice of OADM depends on the application     

Architecture and design of optical channel protected ring networks

In this paper, different optical ring architectures are considered and the optical add/drop multiplexer (OADM) functional architecture is described. In addition, different aspects of ring network design and their impact on the network architecture are discussed     

城域DWDM光网络技术方案研究

主要论述了DWDM光复用、DWDM可配置光环和DWDM网状网等3种主要的DWDM城域核心组网方案，分析了各种方案的特点和应用范围。     

Metropolitan DWDM: a dynamically configurable ring for the KomNetfield trial in Berlin

We present the system concept of a dynamically configurable all-optical add/drop multiplexer for metropolitan wavelength division multiplex rings using dense channel spacing (DWDM). We first outline the essential network requirements. Subsequently, an optical system concept is presented that meets these requirements. In the network elements, innovative all-optical switching technology is employed. Tunable fiber Bragg gratings that perform routing functions by wavelength filtering are discussed in more detail. The system is laboratory-tested. It has been installed in Berlin for a multi-vendor field trial within the German research program “KomNet.” Three optical add/drop multiplexers form a dynamically configurable Metro DWDM ring. Metro DWDM accommodates high bandwidths: a metropolitan ring that provides 0.8 terabit/s ring capacity has been demonstrated. Furthermore, Metro DWDM can provide optically transparent channels enabling the transport of various data formats simultaneously, e.g., SONET/SDH and Gigabit Ethernet. Conversion to a standard format becomes obsolete. The all-optical add/drop multiplexer (OADM) presented provides both manual and dynamic configuration. The system concept of the OADM is developed starting with basic metropolitan DWDM network requirements. The features of the DWDM ring are described, followed by a presentation of the system concept of the flexible OADM. Our focus is on dynamic configuration techniques. Since tunable fiber Bragg gratings are promising components for dynamic optical channel switching, this technology is treated in more detail     

光分叉复用器技术及其应用

介绍了目前几种常见的光分叉复用器(OADM)的结构和原理,对OADM在长途干线网、城域网以及自动交换光网络(ASON)的应用进行了阐述,给出了OADM的一些最新研究进展及发展方向.     

光分插复用器原理及应用

作为全光通信网的核心设备的光分插复用器（OADM）,对全光网的传输能力、组网方式、关键性能都具有重要影响。本文首先在引言部分介绍光分插复用器产生的背景及分插复用器的发展阶段,之后详细阐述了光分插复用器的基本原理、基本要求。在此基础上,本文探讨了光分插复用器的分类及结构。在此部分,分析了以下几种光分插复用器：阵列波导光栅型OADM、采用声光可调谐滤波器的OADM、波导-光栅型OADM、光纤-光栅型OADM。接着,本文分析了OADM在WDM全光网络及OCDMA全光网络中的应用。最后,文章阐述了OADM技术与产品现状及发展趋势。     

城域WDM设备的应用及发展

从干线网建设日趋完善,城域网传输成为干线业务的支撑点.城域网光传输存在MSTP、OADM、CWDM等,OADM成为核心层、汇聚层的主体设备,其技术解决方案和技术特点;其次,介绍了CWDM设备的技术特点和网络应用;最后就两种技术与ASON的发展关系进行了论述.