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1、New Technologies of Optical Fiber Communication,New Technologies of Optical Fiber Communication 2005.5.31.,Tel: +86-10-62281173-603 E-mail: ,Key Lab of Optical Communication and Lightwave Technologies (Beijing University of Posts and Telecommunications), Ministry of Education, P.R.China,Dr. Yongjun
2、Zhang Dr. Kun Xu,Course Outline,Introduction (2) Photonic Crystal and its Application in OFC (4) Functional Devices and All Optical Signal Processing (6) All Optical Logic Operation (2) OTDM and its Key Technologies (2) High Speed DWDM and its Key technologies (8) O-CDMA and its Network Application
3、(2) OAN and Free Space Optical Communication (2) Key Technologies in the Next Generation ON (6) Your Presentation Courses (2-4),光网络的发展 全光网络 ASON MSTP RWA OBS IPoverWDM? 信息网络的未来,内容,电信运营业发展现状,需求不继导致电信运营业陷入低迷期 基础网络建设速度放慢 降低成本、增加收入、开发新业务成为网络建设重点 行业衰退，运营商投资趋于理性,TDM,ATM,IP,运营商建设思路,长途波分干线呈现“容量”、“距离”、“性能”三个
4、方面的升级,对成熟网络的评估、优化,ASON智能光网络进入试验性阶段,光网络建设热点的转变,光网络从“关注技术性能”到“关注网络适应性”,城域网对新业务的适配性,光传送网的技术发展趋势,TDM Speed,Cross capacity,Distance,Services,Intelligence,OCS,由最典型的宣传口号为“光因特网”、“智能光网络” 转为最典型的宣传口号为“optimize your network”,特征,时间,干线建网的关注点：“容量升级、距离升级、性能升级”,16波,32/40波,40波，可升级到80/160波。,ELH： 单跨能力强，可达150KM以上；无电中继传输
5、能力较强，可达1000KM以上,ULH： 单跨能力强，可达150KM以上；无电中继传输能力非常强，最长可达4000KM，超长大环应用,LH： 单跨能力弱，无电中继传输能力小于640KM,内置光谱分析单元：远程监测光谱性能,内置OTDR： 实现光缆质量在线监测,AGC & ALC、功率预均衡： 自适应外界因素导致的光纤衰耗变化；利于更多波长、更长距离传送,距离升级,性能升级,容量升级,OSC可传送PDH时钟,全业务接入： 支持GE、2.5G、10G、45M-1.25G、TMUX,400G,800G,1600G,Interleaver,C/L Filter,OA,C-Band,L-Band,120
6、0G,随着技术的进步和成本的不断降低，升级的成本会越来越低,容量在线升级,多种技术实现距离升级,带内/带外FEC、增强FEC、Raman放大技术、SuperWDM技术均为长距离无电中继传输系统的商用技术。,Long-Term Network Evolution Trends,WDM Mux,PBX,ATM/FR,IP,PSTN/ESS,IP/Etthernet,IP-PBX,ATM/FR,IP/Ethernet/ MPLS,VoIP/SS,SONET/SDH ADM,DWDM Mux,OTN Mux,PBX,ATM/FR,PSTN/ESS,IP establishes as the ideal
7、 technology for service creation & the control plane Ethernet emerges as the main L2 CLE services interface for both best-effort and flexible QoS (e.g., elastic) data applications SDH blends packet transport aspects of Ethernet/MPLS technology and maintains transport vs. service network segregation
8、DWDM remains as a thin infrastructure layer network (for virtual fibers),Converged Multi-Service,NG SONET/SDH ADM,Traditional SONET/SDH ADM,Legacy,Today,Future,ASON,MPLS,光传送网络优化的三个目标,最终实现光网络与客户层整个网络端到端快速业务服务和动态带宽管理，全网智能化,10G或2.5G,155/622,10G,OCS,OMT,OEA,提供Mesh网提高业务生存性,OVPN,提供OVPN、流量工程、UNI、支持SLA、全网端到
9、端服务,网络的逐步智能化,全光网络的提出和发展,光纤通信技术已经经历了几个重要的发展阶段： 1. 单波长点对点传输 2. WDM点对点传输 3. WDM全光网,Traditional Static Network,Point-to-Point DWDM,IP Router Mesh,Traditionally, the optical layer of the network has been viewed as a simple transport medium. DWDM systems were deployed on a point-to-point basis, Traffic fo
10、rm source to destination must be processed in electrical domain at intermediate nodes - Electronic bottleneck,WDM全光网概念,WDM全光网以光处理节点代替原有的电处理节点，信息进入光网络层后，始终以光的形式存在，直至到达其目的接入节点处才进行光/电转换。,Source,Destination,B,A,Dynamic Network,intelligence Switched Optical Network,IP Router Dynamic Mesh,With OXCs, we ca
11、n dynamically setup an all-optical transparent lightpath between source nodes and destination nodes when needed. Data carried on these lightpaths avoid electronic conversion or processing at intermediate nodes, thereby alleviating the electronic bottleneck.,全光网中OXC节点和OADM节点,OXC节点和OADM节点是全光网中的核心节点，它们以光信号的波长为标识在光域内对信号进行交叉连接和上下路处理。由于避免了“电子瓶颈”的限制，网络传输容量及节点吞吐量可以大幅度提高。,OXC设备实例:Siemens,