有线接入网的发展趋向

本文先说明国家通信网有骨干网和接入网，而接入网有有线接入网和无线接入网。目前，固定的有线接入网是电话接入网和有线电视网分别运用，但有倾向合并为统一的有线接入网，提供各种信息业务，特别是宽带通信和电视。于是，在指出通信用户单位用户和往家用户两类之后，说明光纤在接入网的应用主要是光纤连至大楼和光纤连至路边，有无源光纤网和混合光纤－同轴网两种实施方案。     

光纤通信技术最新动向

先讲光纤通信在国家宽带通信网的骨干运输网中应用和技术的新发展，包括宽带光纤放大器，密集波分多路系统，激光器－调制器集成，光电子集成接收端机以及光子器件和全光通信网，然后介绍光纤通信在市内接入网，有线电视网和专用局域网中应用和技术新发展，包括光纤连到住家，光纤连至路边，光纤连至大楼三种情况，以及光纤与同轴混合和无源光纤网两种办法，最后，讲到固定通信与移动通信聚合，光纤与无线并重，光纤通信技术将继续加     

光纤连至住家的初次装用

一、试装ＦＴＴＨ的由来 自从２０世纪８０年代光纤开始加大规模发展应用以来，一切都很顺利，凡是长途网的主要线路和市内局间线路都陆续安装光纤光缆，以代替原有铜线和电缆，电子高压线路和铁道专用干线也都充分利用光纤光缆，新建通信干线也都一律采用光纤光缆，不用铜线电缆，光纤的作用受到众人赏识，光纤发展建设的势头越来越迅猛。２０世纪９０年代以来，通信网对更大范围的线路改用光纤光缆，包含宽带接入网的部分线路，和从交换局连往业务单位和公寓的“光纤至大楼”（ＦＴＴＢ），以及“光纤至住家用户群集的路边”（ＦＴＴＣ）…     

FTTH网络的测试

光纤到户（FTTH）是指将光网络单元（ONU）安装在住家用户或企业用户处,是FTTX系列中除FTTD外最靠近用户的光接入网。通过无源光网络（PON）,FTTH可令多个用户共享单个光纤,而无需使用任何有源器件,从而大大降低了网络安装、管理和维护成本。     

探索发展我国光纤到户策略

导语：FTTH是指将光网络单元（DNU）安装在住家用户或企业用户处，是光接入系列中除FTTD（光纤到桌面）外最靠近用户的光接入网应用类型。本文简要介绍了世界各国光纤到户的最新进展，并着重论述了我国发展光纤到户中存在的问题，并从标准化，市场培育，产业链和适度政策扶持等方面探讨了加快我国光纤到户的发展策略。     

我国FTTH现状分析和思考

FTTH（Fiber To The Home），顾名思义就是一根光纤直接到家庭。FTTH是指将光网络单元（ONU）安装在住家用户或企业用户处，是光接入系列中除FTTD（光纤到桌面）外最靠近用户的光接入网应用类型。FTTH的显著技术特点是不但提供更大的带宽，而且增强了网络对数据格式、速率、波长和协议的透明性，放宽了对环境条件和供电等要求，简化了维护和安装。     

探索我国光纤到户发展策略

导语:FTTH是指将光网络单元(ONU)安装在住家用户或企业用户处,是光接入系列中除FTTD(光纤到桌面)外最靠近用户的光接入网应用类型.本文简要介绍了世界各国光纤到户的最新进展,并着重论述了我国发展光纤到户中存在的问题,并从标准化、市场培育、产业链和适度政策扶持等方面探讨了加快我国光纤到户的发展策略.     

谈谈用户接入网的建设

谈谈用户接入网的建设中国通信建设第四工程局袁立云１用户光纤接入网的拓扑结构和特点各地在建设光纤接入网时可以有以下几种拓扑结构供选择使用。（１）单星型结构单星型结构如图１所示。这种结构实际上是点对点，即采用光纤将交换点与用户连接起来，结构简单，使用维护...     

光纤接入网技术及其应用

由于铜线接入网受一些不可克服因素的限制，这使得信息高速公路在用户接入段形成了“瓶颈”。在这种情况下，人们自然想到了光纤，毫无疑问，光纤是接入网的理想传输媒介。为了满足用户的需要，各国根据自己的国情，制订了接入网改造和建设计划，加快研制接入网设备，逐步用光纤取代铜线。由此，光纤接入网得到了迅速发展。光纤用于接入网，主要有以下几个优点。     

浅析光纤入户的建设及运行维护

FTTH（Fiber To The Home光纤到户）是一种光纤通讯的传输方法。是直接把光纤接到用户的家中（用户所需的地方）。具体说,FTTH是指将光网络单元（ONU）安装在住家用户或企业用户处,是光接入系列中除FTTD（光纤到桌面）外最靠近用户的光接入网应用类型。FTTH的综合造价在逐年降低,设备单价的降低使得FTTH总体成本与FTTB基本持平,而FTTH建设模式性价比无疑最高。而FTTH让光纤延伸至用户家中,接入带宽高,使得全程光纤网络有源节点大幅减少。FTTH的显著技术特点是不但提供更大的带宽,而且增强了网络对数据格式、速率、波长和协议的透明性。     

发展光接入网的新途径

简述通信接入网的发展概况,指出现代通信网的用户接入网部分正在从原来的无源光网络向超级无源光网络(superPON)发展,它将真正实现光纤连至每个家庭,而且将显著加大接入的带宽能力、数字信息速率和延长传输距离范围。用户家庭不再需要中间站的接入节点(AN),而是经过光纤放大器直接连至核心网中的AN。文中具体叙述superPON的结构、主要技术和协议,包括光放大器、光突发接收机和媒体接入控制(MAC)协议,并讨论降低成本的可能性和未来演进。     

A framework for resource dimensioning in GPON access networks

In gigabit passive optical networks (GPONs), the ports of the optical line terminal (OLT) support passive optical networks (PONs). An optical split ratio supported on an OLT chassis determines the number of optical network units (ONUs) which can share PON link capacity. Generally, network planners tend to do dimensioning for PON link capacity (OLT port) based on the number of subscribers and their type (i.e. residential or business). Although this dimensioning approach is simple, it does not guarantee a selection of optical split ratio which can optimally allocate bandwidth to end‐subscribers. In this paper, we develop an integrated mathematical framework for optimally dimensioning resources in an GPON access network, namely OLT capacity. This framework comprises three resource‐dimensioning approaches which are based on user requirements: GPON link utilization and capacity optimization. Our mathematical framework has been integrated into software for GPON resource dimensioning, which we have developed to evaluate the support and performance of services in GPON access networks. Copyright © 2011 John Wiley & Sons, Ltd.     

Full service optical access networks: ATM transport on passiveoptical networks

Multimedia communication has become the driving force for installing broadband systems in the public network. Different alternative solutions have been presented to realize a broadband interactive access network, such as installing optical fiber or upgrading the existing copper network with ADSL for twisted pair or hybrid fiber coax for CATV networks. Among these alternatives, optical fiber access networks are seen as the most future-safe solution. Especially, passive optical networks prove to be a cost-effective way to introduce fiber into the access network. This article presents ATM-based transport on passive optical networks, starting with a current implementation of an ATM-PON (APON) system that has already been installed for various trials. It further describes the evolution of APON systems to high-splitting, long-range PONs. The increase in both number of subscribers and distance range is discussed in combination with some specific technological issues such as upstream burst mode optical amplification. Special emphasis is placed on the work carried out within the scope of the ACTS PLANET project     

Risk analysis of residential broadband upgrade in a competitive andchanging market

The article presents risk and techno-economic analyses of broadband access network upgrade strategies for public network operators and cable operators in a competitive environment in the residential and small business market. The effect of uncertainties in predictions of critical parameters such as demand forecasts and market shares are analyzed. The assessed technology options include broadband twisted pair modem, hybrid fiber coax networks, and ATM-based passive optical networks     

光纤向楼栋发展

光纤向楼栋发展,既是广电网络业务发展的需要,也是三网融合的需要。成熟的EPON技术和廉价的光纤为光纤向楼栋发展铺平了道路。针对目前经济状况一般的地区,提出光缆网络建设3~5年内不宜盲目向光纤到户、全光网发展。比较细致地论述了光纤向楼栋发展的必要性和重要意义,以及实施操作中技术的可行性及需注意的事项。     

A Location-Routing Problem in Designing Optical Internet Access with WDM Systems

In this paper, we deal with a location-routing problem in designing the optical Internet with WDM systems. This problem arises from the design of broadband local access networks that deliver high-speed access service to residential subscribers. The problem is to find an optimal location of the gateway and optimal routing of traffic demands in the optical access network. We develop mixed-integer programming models for solving the location-routing problem to minimize the total cost of network elements used in the network while carrying the offered traffic. By exploiting the inherent structure of the problem, we derive two effective tabu search procedures. We present promising computational results of the proposed solution procedures.     

Design and performance of ultra-high-density optical fiber cable with rollable optical fiber ribbons

This paper proposes a novel ultra-high-density optical fiber cable that employs rollable optical fiber ribbons. The cable has great advantages in terms of cable weight and diameter, and fiber splicing workability. Moreover, it will be easy to install in a small space in underground ducts and on residential and business premises. The structural design of the rollable optical fiber ribbon is evaluated theoretically and experimentally, and an optimum adhesion pitch P in the longitudinal direction is obtained. In addition, we examined the performance of ultra-high-density cables with a small diameter that employ rollable optical fiber ribbons and bending-loss insensitive optical fibers. The transmission, mechanical and mid-span access performance of these cables was confirmed to be excellent.     

深圳网通小区GEPON解决方案

随着互联网用户数量的快速增加,对接入网带宽的需求也不断增长.千兆以太网无源光网络(GEPON)技术已成为网络接入技术的新贵,它是集高速数据、视频及语音业务于一体的综合接入解决方案.利用光纤到户/光纤到大楼/光纤到路边(FTTH/FTTB/FTTC),可为家庭用户、企业用户等提供高达1 Gbit/s的最大带宽.GEPON以其经济的造价、方便的接入、易维护和简单的网络结构,正得到越来越多的通信运营商及厂商的支持和认可.文章介绍了深圳网通小区GEPON解决方案.     

商务楼中光纤建设模式的研究

在全业务运营背景下,商务楼接入成为各大运营商综合业务竞争的焦点,商务楼对光纤接入的需求旺盛,需要铺设有大量的光纤接入,占用大量的管路资源,采用基于PON的光纤接入是一种能既能节省网络资源、节省建设投资又能提高较高带宽的解决方案.通过对杭州市区近25幢商务楼的统计,对商务楼的接入需求做了一个简单的分析和归类,通过计算不同模式下的光纤需求量,提出光纤到商务楼建设方案中应实施＂光分到楼＂的策略。     

2001年全球DSL发展回顾

DSL作为一种大众化的宽带接入技术,已在所有发达国家和大多数发展中国家得到推广应用。到2001年第二季度,亚太的用户数首次超过北美,成为世界上最大的市场。一般来说,住宅用户的比例高于商业用户;在DSL发展较快的地区,住宅用户比例更高些;而在DSL发展较慢的地区,商业用户较多。目前各国普遍采用的推广措施主要包括:建立专门的宽带门户网站、与ISP捆绑接入、为一定服务期限的用户打折、为现有的电话用户打折、免费提供支持DSL的计算机,以及提供家用网络业务等。