IP／DWDM光因特网路由选择机制的研究

The requirements of IP/DWDM optical Internet routing are analyzed. Guaranteeing QoS, survivability and last routing, and supporting multicast and making lull use of the resources of network are the basic requirements for it. Point out that QoS and survivability are the most important two keys to optical Internet routing. Summarize the common implementations which are used to satisfy these requirements. At last, point out the further steps that should be taken.     

未来光传送网核心技术展望

介绍光传送网技术的发展历程和现状，简述光传送网技术发展的一些观点，展望未来光传送网发展的核心技术。     

偏振对DWDM系统内四波混频噪声的研究

使用了一种有效的能对四波混频(FWM)噪声对DWDM系统性能影响程度进行评估的仿真模型.通过对使用在线色散补偿与后补偿相结合的新型色散管理光纤链路进行仿真,看出每个周期跨距内的残余色散对FWM噪声有一定抑制作用,适当提高每个周期跨距内的残余色散有助于提高总的非线性容限和系统的整体性能.     

IP／DWDM光因特网中一种基于人工免疫算法的QOS组播路由算法

本文提出了一种IP／DWDM光因特网中基于人工免疫算法的QoS组播路由算法，当QoS组播请求和需求区间给定时，能够找到一棵基于QoS的柔性费用近优组播路由树。该算法基于人工免疫算法构造QoS组播路由树，并基于波长图对树进行波长分配，将路由和波长分配集成到一个过程中，同时考虑了负载平衡。仿真结果表明，算法为IP／DWDM光因特网中的组播应用构造的QoS组播路由树是可行和有效的。     

电视信号在省网内的传输与维护

DWDM技术允许各载波信道在一条光纤内同时传输，充分利用光纤的带宽，可直接接入多种业务，基于DWDM的SDH传输平台已成为骨干传输的主流，在此平台上，一部分带宽用来传输广播电视节目，另一部分用来直接传输用户数据等，介绍广播电视信号在省网传输中的常见故障及解决办法。     

密集波分复用技术及其应用

随着网络带宽的剧烈增长和对服务质量的要求不断提高，密集波分复用技术（DWDM）和全光网络正成为研究的热点。通过在一条光纤上传输多个波长的光信号，DWDM能够极大提高光网络的传输能力。在全光网络中，信息的传输和处理都是在光域中进行的。本文对近期的DWDM和全光网络的研究进行了回顾，特别关注了以IP over DWDM为基础的光因特网的进展。     

Optical-LSP Establishment and a QoS Maintenance Scheme Based on Differentiated Optical QoS Classes in OVPNs

A virtual private network (VPN) over Internet has the benefit of being cost-effective and flexible. However, it has difficulties providing sufficient QoS and adequate transmission capacity for high bandwidth services. Given the increasing demand for high bandwidth Internet and the demand for QoS assurances in a VPN over Internet, IP/generalized multi-protocol label switching (GMPLS) based on a control plane combined with a high-bandwidth, dense-wavelength division multiplexing (DWDM) optical network is seen as a very favorable approach for realizing the future optical VPN (OVPN) over IP/GMPLS over DWDM. Within this architecture, providing QoS guaranteed multimedia services with a differentiated QoS guaranteed protocol framework with QoS recovery is one of the key issues to implement. Therefore, we suggest in this paper optical-label switched path (O-LSP) establishment and its QoS maintenance scheme based on differentiated optical QoS-service (DOQoS) classes. They are the key components for this DOQoS framework in assuring end-to-end QoS in an OVPN over IP/GMPLS over DWDM architecture.     

SUPANET中的物理帧时槽交换技术

文中从分析未来“三网合一”的需求和现有基于DWDM交换技术存在的问题出发,提出了用以太网的介质访问控制(MAC)子层的帧格式作为物理帧格式,以最大长度的MAC帧传输时间作为基本时槽的“物理帧时槽交换(PFTS)技术”,并以此作为实现下一代单物理层用户传输平面体系结构(SUPA)的基础。文中提供了实现：PFTS的技术框架,详细地讨论了PFTS交换原理和服务质量保障机制,简要地分析PFTS相对于已有的物理层交换技术的优越性。     

阵列波导光栅插入损耗的降低

阵列波导光栅（AWG Arrayed Waveguide Grating）是实现多通道密集波分复用（DWDM Dense Wavelength Division Multiplexing)光网络的理想器件,插入损耗是它的一个重要性能指标。本文介绍了多种减小AWG插入损耗的方法,并在此基础上,分析了如何使用楔形波导结构来降低模式失配所导致的耦合损耗。这种方法可以在不增加器件制作难度的同时大大降低AWG的插入损耗,并且适用于各种材料和结构的AWG器件设计。     

A novel ring-tree-based routing and wavelength assignment algorithm for multicasting in DWDM optical mesh networks

Multicast session communications, such as video-conferencing and video-broadcasting, in DWDM mesh networks require the efficient multipoint-to-multipoint multicast algorithms. Several heuristics have approximate solutions using lightpath or light-tree for one-to-multipoint multicast communications, but few papers have discussed the multipoint-to-multipoint multicast problems in DWDM mesh networks. This paper proposes a ring-tree-based routing and wavelength assignment (RTRWA) solution in DWDM mesh networks. It proceeds to multipoint-to-multipoint multicast transmission by reserving links and wavelengths assigned by the Least Converter Count algorithm. The RTRWA algorithm tries to find an optimal ring path that connects all multicast session members with unidirectional links and connects the remaining nodes to the ring path with the light-tree. The RTRWA algorithm outperforms the Steiner minimal tree (SMT) algorithm in terms of the call blocking probability, difference in user capacity and the mean maximum transmission time.