WDM光传送网的设计与操作

综述一WDM光传送网的设计和操作问题，首先介绍了一些基本概念，然后给出了有关WDM光传送网的不同问题及其设计方法，最后描述了对WDM光传送网进行操作的一此算法。     

WDM城域光传送网的网络管理

基于wDM的光网络由于承载的信息量非常巨大，网络的任何故障和失效都将造成严重的后果，因此研究这种网络的网络管理十分重要。在叙述了基于wDM技术的光网络的网络管理体系结构和特殊要求之后，着重对其网络开销的传送技术-光监控信道(OSC)技术进行了研究，井进一步探讨了光城域网环境下的OSC技术。     

WDM光传送网中支持优先级的波长分配算法

文中提出了一种用于WDM光传送网的支持优先级的波长分配算法－动态门限法,该算法保证了较高优先级的光路建立请求具有较低的阻塞率,同时又考虑到较低优先级的光路建立请求的性能优化,从而很好地降低了全网的平均阻塞率。文中给出了计算机仿结果。     

WDM光传送网的选路和波长分配算法

文章综述了波分复用(WDM)光传送网的选路和波长分配(RWA)算法;考虑了两种需求情况一种是从建立光路的需求出发,另一种是从运送分组业务的需求出发;还概述了RWA设计中要考虑的附加问题,包括波长变换、抗毁和服务策略.     

光传送网标准的研究进展

文章根据ITU-T关于光传送网(OTN)建议的研究进展,对已经完成、正在制订和将要制订的OTN建议的主要内容以及相互间关系等进行了介绍。     

波分复用光传送网及其关键器件技术

近年来通信流量增长非常快,尤其是以Internet为主的数据通信流量出现了爆炸式增长,保守的估计是每六个月翻一番。通信流量的急剧增长给传送网带来了很大的压力,许多光纤网络容量的使用率达到了70-80％,在某些情形严重的路由上,连备用容量也已经耗尽了。这迫使网络公司增加网络带宽,减小网络的拥塞。增加带宽的方法主要有:     

光传送网与光电子工业

本文阐述了光传送网(OTN)的概念及其发展,并论述了正在蓬勃发展的OTN对光电子工业的牵动力.     

光传送网与光电子工业

8本文阐述了光传送（OTN）的概念及其发展，并论述了正在蓬勃局长的OTN对光电子工业的牵动力。     

光传送网与光电子工业

本文阐述了光传送网(OTN)的概念及其发展，并论述了正在蓬勃发展的OTN对光电子工业的牵动力。     

光传送网的传输性能和传输限制

文章简述了光传送网的演变及其传输特点,分析了它在DWDM技术支持下的传输性能并给出了描述传输能力的主要性能指标,研究了光传送网实现大容量、高速率、长距离传输的主要限制.     

Design of virtual topologies for large optical networks through an efficient MILP formulation

In this paper we propose a Mixed-Integer Linear Programming (MILP) formulation for designing virtual topologies of wavelength-routed optical networks, considering as objective function the minimization of the traffic electronically forwarded at the network nodes. Our goal is twofold. Firstly, to reduce packet router processing requirements of the electronic routers, and secondly, to get the most transparent traffic distribution for a given traffic matrix, using the available optical resources at the nodes. The proposed formulation was applied successfully to reasonable sized networks yielding optimal solutions in a few minutes. To the best knowledge of the authors, this is the first report on optimizing virtual topology and traffic routing of large optical networks with a low computational cost MILP formulation.     

波分复用光网络模拟软件中的原子器件

本文基于原子功能模型,提出了原子器件的概念.提出了利用原子器件建立WDM光网元设备对光信号的响应模型,建立并分析了线性响应条件下光网络器件的原子功能数学模型.给出了用于构建关键网元设备OADM/OXC的基本原子器件,并讨论了模型运算关系和运算结果.介绍了原子器件在光传送网模拟软件网元设备建模中的应用.     

Design and performance comparison of multiple-token based MAC protocols for optical burst switched ring networks

Optical burst switching (OBS) has been proposed as a new optical switching paradigm for the next generation Internet due to its flexibility and feasibility compared to OCS and OPS. Moreover, serving as a backbone that interconnects a number of access networks, OBS ring topologies have been a good choice for solving the current metro gap problem between core network and access network owning to its simplicity and scalability. In this paper, we provide an insight into the OBS ring network that consists of nodes using TT–TR (Tunable Transmitter–Tunable Receiver). The node architectures with TT–TR may make efficient use of network resources even though traffic pattern, such as IP traffic with self-similarity dynamically change, and can support good expandability. However, all nodes share the limited network resources. This may result in contention such as wavelength contention and transceiver contention leading to burst loss. In order to use the shared network resources fairly and efficiently as well as reducing the resource contention, we focus on the design of medium access control (MAC) protocols based on multiple tokens. Each token is allocated to one wavelength to denote the accessibility of that wavelength, i.e., once the token is captured, the corresponding wavelength can be used to transmit a burst. As tokens hold the key for using wavelengths to transmit bursts, token management including the token release time is crucial in the proposed MAC protocols. Thus, two kinds of multiple-token based MAC protocols with different token release times are proposed: token release after transmitting burst (TRTB) and token release after transmitting control header (TRTC). Each of them is classified into two schemes called TRTB/TRR and TRTB/RCA and correspondingly TRTC/TRR and TRTC/ RCA. RCA stands for receive collision avoidance. The target is to increase the performance while reducing the processing overhead at each node. The performance of the TRTB and TRTC protocols are evaluated and compared in terms of queuing delay, burst loss rate, and channel utilization by OPNET simulation. The effects of various design parameters are also investigated through simulation in order to evaluate their scalability. In all the proposed schemes, tokens are just used to denote the accessibility of each wavelength. Finally, as an alternative, we also propose a new scheme based on the TRTC protocol called TRTC/CAT (collision avoidance by tokens) to avoid contention by using tokens.

多光纤WDM网中支持QoS的波长重路由算法

在WDM网上，波长连续性限制会降低网络的信道利用率，增加光路建立请求的阻塞率。采用波长重路由技术可以减少波长连续性限制对网络性能的影响。该文采用波长图模型，对多光纤WDM网中支持QoS的波长重路由算法进行了探讨，提出一种支持QoS的波长重路由算法－－动态选择法，并采用两种网络模型，在不同负载的动态业务下对所提算法进行了仿真研究；仿真结果表明所提算法既满足了上层业务不同的QoS要求，同时又充分利用了有限的网络资源，使全网的平均阻塞率降低。     

一种公平的多优先级WDM光网络波长分配算法

文章研究了波分复用(WDM)光网络中动态业务下的波长分配问题,在无波长转换器的条件下,提出了一种加入了公平性考虑的动态门限算法.该算法在支持多优先级的动态门限法的基础上,通过更新初始优先级减少了不同距离光路连接请求间的阻塞率差别,改善了公平性.计算机仿真结果说明了该算法的有效性.     

WDM光网络中的业务量疏导

波分复用（WDM）技术在主干传送网中巳广泛应用，WDM光网络的研究进展也非常迅速，光网络中的业务量疏导定义为复用、解复用和交换低速率业务流到大容量的光路中的行为。介绍了WDM光网络的业务量疏导的重要性，研究方法及其最新研究进展情况。     

Mini-slot TDM WDM optical networks

In recent years, optical transport networks have evolved from interconnected SONET/WDM ring networks to mesh-based optical WDM networks. Time-slot wavelength switching is to aggregate the lower rate traffic at the time-slot level into a wavelength in order to improve bandwidth utilization. With the advancement of fiber-optics technologies, continual increase of fiber bandwidth and number of wavelengths in each fiber, it is possible to divide a wavelength in a fiber into time-slots, and further divide a time-slot into mini-slots so that the fiber bandwidth can be more efficiently utilized. This article proposes a router architecture with an electronic system controller to support optical data transfer at the mini-slot(s) of a time-slot in a wavelength for each hop of a route. The proposed router architecture performs optical circuit switching and does not use any wavelength converter. Each node in the mini-slot TDM WDM optical network consists of the proposed router architecture. Three different network topologies are used to demonstrate the effectiveness and behavior of this type of network in terms of blocking probability and throughput.     

WDM光网络中固定路由的优化算法

通过研究WDM光网络中固定路由策略的选取对网络性能的影响，提出了一种新的用于优化固定路由的算法-综合代价法。该算法综合考虑了链路负载和路由跳数这两个因素，以综合代价为策略进行路由优化。计算机仿真结果表明，针对不同的网络负载情况，综合代价法能够有效地降低网络的阻塞率，提高网络的性能。     

层次化的光电多芯片组件CAD系统结构设计

为了有效地对ＯＥＭＣＭ 进行设计和封装, 在实际工作中迫切需要一种集成化的ＣＡＤ 系统。通过对ＯＥＭＣＭ 系统设计过程的研究, 提出了一种集成的层次化的ＯＥＭＣＭＣＡＤ 软件的系统结构。