光传送网络成帧器设计

针对超高速率的光传送网络(Optical Transport Network,OTN)数据信号,在研究光传送网络帧结构的基础上,提出了一种适合高速率、大位宽的成帧器处理电路,将48比特的FAS信号分为两部分进行比较,第一部分为64个24比特比较器,第二部分为一个24比特比较器。将电路的规模降低了一半,提高了电路的处理速率。通过软件仿真后,使用综合工具综合的结果显示,电路处理速率可达到235.74MHz。     

The design of a European optical network

This paper presents a number of design issues under consideration in the development of an all-optical network linking major centers in Europe. The proposed network is characterized by spanning a large geographical area, the diameter is in excess of 3000 km, but with a relatively small number of nodes (20). The study combines aspects of two optical network projects funded by the European Commission: COST 239-ultra-high capacity optical transmission networks and RACE 2028: multiwavelength transport network. The network uses multiwavelength technology and combines wavelength selection and space switching to achieve signal routing. One of the objectives of the study is to understand the extent to which transparency can be achieved in such a large network. For example the effect of using amplifiers to achieve transparency is to provide extremely long fiber paths in which non-linear effects may become significant and effectively limit the number of wavelengths that can be employed; this limit may be at conflict with the number of wavelengths required from a traffic viewpoint. The paper therefore considers capacity requirements, transmission limitations and node and network architecture issues. It is concluded that partitioning of the network may be necessary to maximize transparency and suggestions are made as to how this might be achieved     

以太无源光网络中光分配网的优化设计

提供了一种兼容光纤CATV网的以太无源光网络(EPON)的光分配网(ODN)设计方法,采用两级光网结构提高了系统设计的灵活性,并给出了光分路器的设计公式;提供了一种冗余环行干线和冗余分支结合进行ODN冗余保护的方法,能极大地提高EPON网络的可靠性。     

双层卫星光网络仿真演示系统设计

为了精确模拟、演示验证双层卫星光网络星际激光链路的稳定和切换,按l:30的比例设计了分时切换低/中轨道(LEO/MEO:Low Earth Orbit/Medium Earth Orbit)双层卫星光网络实验演示系统.系统由SITL(System-In-the-Loop)模块将硬件平台和计算机仿真平台互联而组成.硬件平...     

A framework for optical burst switching network design

We analyze optical burst switching (OBS) systems. The analysis leads to a framework which provides guidelines for OBS design. We identify conditions for OBS feasibility and the relationship between burst size, or equivalently burst assembly delay, and throughput, taking into consideration control packet processing and the number of available wavelengths per fiber     

Overspill routing in optical networks: a true hybrid optical network design

To efficiently support the highly dynamic traffic patterns of the current Internet in large-scale switches, we propose a new hybrid optical network design: Overspill Routing In Optical Networks (ORION). By taking advantage of the reduced (electronic) processing requirements of all-optical wavelength switching, the electronic bottleneck is relieved. At the same time, ORION achieves a level of statistical multiplexing comparable to the more traditional point to point WDM solutions, circumventing the bandwidth inefficiencies of all-optical wavelength switched networks, caused by dynamic traffic patterns. The result is a true hybrid optical network design, forming a bridge between these two switching concepts. In this paper the generic concept of ORION is described. An example node design, based on current advanced optical technologies, is described in detail. The ORION concept is also evaluated, comparing it with its two composing technologies, optical wavelength switching and point to point WDM, as well as a third, more trivial, hybrid one, through several case studies.     

智能光网络中的OA＆M系统分析与设计

操作、管理和维护(OA&M)信息的传输和处理是智能光网络的的关键技术之一.文章首先对比光传送网络(OTN)中OA&M需求,分析了智能光网络中OA&M需求的变化.然后,针对OA&M传输机制、处理复杂度和带宽占用3个方面,讨论了OA&M系统在智能光网络中实现的难点,比较了现有的处理手段.在此基础上,提出了结合多种消息传输方式,分层、分域处理实现OA&M系统的思想.最后,按照这种思想,设计了一种适用于智能光网络的OA&M原型系统.     

CAPEX/OPEX effective optical wide area network design

The focus of this paper is on the design of the so-called Optical Wide Area Networks (owans), i.e., optical networks that cover broad areas. Our objective is to investigate efficient owan network design, where demand provisioning takes full advantage of the nodal switching equipment and of the network interface platforms under asymmetric traffic. It involves granting all traffic requests while minimizing the network capital and operational expenses, throughout an optimal dimensioning of the nodal equipment, i.e., minimizing the number and the location of the network nodal equipment. The originality of our work is in the forethought and the investigation of these issues.     

Hybrid-hierarchical optical path network design algorithms utilizing ILP optimization

In this paper, we present design algorithms for the hierarchical optical path networks that utilize hybrid-hierarchical optical cross-connects (hybrid-HOXCs). The hybrid-HOXCs employ a waveband cross-connect for routing waveband paths and an electrical cross-connect for grooming wavelength paths. We first develop an integer linear programming model to solve the network design problem. We then propose a 2-stage ILP-based design algorithm for hierarchical optical path networks that utilize the hybrid-HOXCs. Its effectiveness is evaluated through numerical experiments. Impact of the critical parameter, electrical/optical port cost ratios, on total network cost is also investigated.     

应用于全光网的取样布拉格光纤光栅数字波分复用器设计

未来全光网促进了新型光数字波分复用器interleaver的发展．基于取样光纤布拉格光栅的interleaver具有低插入损耗、多信道均匀反射峰和低色散等优点,特别适用于全光网的波长复用／解复用、插入／分离。为此提出了基于取样布拉格光纤光栅Interleaver的设计理论方法,合理设计其结构参数,并对其多波长滤波输出谱进行数值仿真,从而在〈50GHZ的DWDM窄带间隔实现均衡多波长滤波。这对光纤光栅在全光网的应用研究有一定的理论意义和工程应用参考价值。     

光环形网的光信噪比分析与系统设计

文章指出光环形网的设计中必须考虑最长环路保护时的光信噪比(OSNR)计算问题。导出了光分插复用／光交叉连接(OADM／OXC)节点级联的OSNR的计算公式。最后针对链路发生故障点不同的同一业务波长配置的保护倒换情况进行了OSNR的分析，给出了环路保护倒换情况下的OSNR最低条件的模型，并依据此模型建立了光环形网工程设计方法，简化了工程设计中OSNR验证的计算量。     

Optimal nonuniform wavebanding in WDM mesh networks

Grouping together a set of consecutive wavelengths in a WDM network and switching them together as a single waveband could achieve savings in switching costs of an optical cross-connect. This technique is known as waveband switching. While previous work has focused on either uniform band sizes or nonuniform band sizes considering a single node or ring networks, in this paper we focus on optimizing the number of wavebands and their sizes for mesh topologies. We formulate a problem of optimizing the number of wavebands in a mesh network for a given set of lightpaths. The objective of the band minimization problem is to minimize the number of nonuniform wavebands in the network while satisfying the traffic requests. We formulate an integer linear program and propose efficient heuristics. Simulation results are presented to demonstrate the effectiveness of the proposed approaches under static traffic case. Our results show that the number of switching elements can be reduced by a large amount using waveband switching compared to wavelength switching. We also apply the proposed waveband strategy to the dynamic stochastic traffic case and evaluate the network performance in terms of blocking probability through numerical simulations.     

Efficient software-defined passive optical network with network coding

The huge increase in broadband service requires much more bandwidth than ever before; however, due to the cost sensitivity, it is not possible to pursue high transmission rate blindly in the access network, which requires us to consider how to improve network efficiency. In this paper, a software-defined passive optical network architecture with network coding (NC) is proposed to reduce downstream bandwidth consumption and thus increases the throughput and network efficiency. To flexibly implement the coding operation on local peer traffic, the NC pair management scheme is provided and keeps the compatibility with the current multi-point control protocol (MPCP) in a single optical line terminal (OLT). Considering the trends in OLT pooling and the requirement of smooth network upgrade, software-defined networking (SDN) techniques are applied in the NC-based passive optical networks. Through re-arranging the affiliations between the OLTs and optical network units (ONUs), the local traffic between peer ONUs will be led from non-NC-supported OLTs to NC-supported OLTs, and then the downstream efficiency will be still quite high even in a hybrid OLT pool. The experiments and evaluation results show that, the software-defined passive optical networks with NC reduce nearly 50 % occupied downstream bandwidth, when there is local traffic between peer ONUs, even in a hybrid OLT pool.     

APON的MAC协议设计

本文结合以ＡＴＭ为基础的无源光网络（ＡＰＯＮ）的Ｇ．９８３建议,提出了一种低信元时延变化（ＣＤＮ）、低信元时延（ＣＤ）、无碰撞、公平,高效的媒质接入控制（ＭＡＣ）协议,并对该协议的性能进行了分析。     

一种基于GEPON的矿用全光通信网络设计

通过分析现有矿井通信网络存在的问题,采用GEPON技术建立一种全新的光通信网络,很好地解决各种通信网络与瓦斯监控系统、电视监控系统在网络互连、传输效率、抗干扰能力、网络运维成本和系统可靠性上的问题,推动现有矿井通信技术的升级改造.     

New nodal design for high throughput data vortex optical interconnection network

This paper proposes a new three input nodal structure within the data vortex packet switched interconnection network. With additional optical switches, the modified architecture allows for two input packets in addition to a buffered packet to be processed simultaneously within a routing node. A much higher degree of parallel processing is allowed in comparison to previously proposed enhanced buffer node with two input processing or the original network node with single input processing. Unlike the previous contention prevention mechanism, the new network operates by introducing the packet blocking within the node if no exit path is available. This eliminates the traffic control signaling and the strict timing alignment associated with the routing paths which simplifies the overall network implementation. This study shows that both data throughput and the latency performance are improved significantly within the new network. The study compares the three input node with the two input node as well as the original single input data vortex node. Due to additional switch count and nodal cost, networks that support the same I/O ports and of the same cost are compared for a fair comparison. The limitation introduced by the blocking rate is also addressed. The study has shown that under reasonable traffic and network condition, the blocking rate can be kept very low without introducing complex controls and management for dropped packets. As previous architectures require operation under saturation point, the proposed architecture should also operate at reasonable level of network redundancy to avoid excessive packet drop. This study provides guidance and criteria on the proposed three input network design and operation for feasible applications. The proposed network provides an attractive alternative to the previous architectures for higher throughput and lower latency performance.     

TDMA fibre-optic network with optical processing

A fibre-optic network with time-division multiple access (TDMA) is implemented using optical processing. The network is capable of accommodating 50 stations transmitting at 10Mbit/s. Synchronisation is achieved using a central optical source with 2ns pulses. Integrated electro-optic modulators and optical fibre delay lines are used to multiplex the stations.     

Modeling of optical devices for the design of multistage interconnection network systems

Guidelines of the modeling of an all-optical architecture is presented. This basic architecture is universal and flexible. It can be used as the switching building block for a number of interconnection networks. The power analysis of an all optical buffering architecture [1] that can be interfaced with such an element is discussed. The modeling analysis is given in terms of the switch model, the multistage model and the power analysis of the optical buffer. The architecture uses bistable optical devices such as Fabry-Perot etalons, SEED and S-SEED. A number of important issues remain to be addressed, such as the use of different nonlinear optical devices, synchronization, and simulation.