集中式制播一体网架构及应用

构建一个集节目制作、播出、收录、归档及备份于一体的集中式全台网,既满足节目制作的业务需求,又很好地解决全台网建设中关于系统互联互通的安全问题,实现对数据广播、网站、户外媒体等新媒体的支持和整合功能,实现媒资素材的网络发布、广播电视节目的网络直播等新业务开发,拓宽创收渠道。主要介绍集中式制播一体网的技术架构、系统组成、关键设备选型及安全设计与应用。     

PON与OBS网络互连结构的研究

光突发交换(OBS)网络的城域网应用需要解决与接入网的互连问题。针对基于集成节点的PON与OBS网络互连方案,研究了集成节点的功能与组成结构,分析了模块之间的信息交互,给出了集成节点结构的一种设计方案,并简单讨论了基于这一方案的汇聚机制和动态带宽分配算法。     

基于内存映射的进程问通信实现跨平台软件互联互通

在某型号改研制过程中,软件运行于WindowsXP操作系统中,需要将VC平台下编写的软件无缝嵌入delphi平台下编写的软件中,实现两个单独运行进程的互联互通。以内存文件映射技术为基础,提出了将共享内存区分为读数据区和写数据区,并利用特定字节设定允许读写标志。在读写数据时,分剐在两个进程中采用间隔相等的轮询定时器,实现了在两个进程中数据的双向通信。后续试验表明,该方法可靠实用,软件改动量小,极大地促进了工厂的型号研制。     

泛在互联车辆传感器网络体系结构研究

针对车辆传感器网络的特点,提出一种基于分簇定向扩散与智能路由的泛在互联车辆传感器网络体系结构。该体系结构充分利用车辆传感器网络节点的多途径联网功能以及自组网能力．利用分簇定向扩散机制形成无线自组网与传统网络相结合的混合逻辑拓扑结构HLT—C＆DD,通过节点的智能路由功能为网络中的数据汇聚提供智能分流途径。理论分析和仿真结果表明,该体系结构能提高泛在互联车辆传感器网络的综合性能。     

Prototype Demonstration of Discrete Correlation Processor-2 Based on High-Speed Optical Image Steering for Large-Fan-Out Reconfigurable Optical Interconnections

We present a discrete correlation processor-2 (DCP-2), which is an optical processor with reconfigurability of interconnection patterns for large-fan-out optical interconnection systems. To our knowledge, there is no reconfigurable optical processor satisfying the requirements for large fan-outs such as high-speed reconfiguration of interconnection pattern, high optical efficiency, and high contrast ratio, because existing spatial light modulators (SLM#x0027;s) lack at least one of these features. The DCP-2 architecture fulfills the requirements by using a hybrid configuration composed of a high-speed image steerer and a spatial light modulator, which work in a complementary manner to shorten the setup time of the SLM. We constructed two kinds of prototype demonstrators based on this architecture. In the experiment, reconfiguration speed of the DCP-2 prototype with shift-invariant optical interconnections, in which a liquid crystal SLM cooperated with a two-dimensional acousto-optic beam deflector, was about 26,000 times faster than that of the standalone SLM at the cost of 50#x0025; energy loss by the deflector.     

64×64点阵达曼光栅的设计与实现

分析了偶数点阵达曼光栅的设计原理与特性。利用数值优化方法 ,获得了一组 6 4× 6 4点阵达曼光栅解。光栅模版用电子束制版法制成 ,其最细线宽为 2 .5 μm。用光刻法实现了这一位相光栅 ,并比较了不同位相光栅制作法的优缺点。原子力显微镜测得的光栅深度曲线与 6 4× 6 4点阵实验结果表明 ,此光栅结果接近理论值。     

CMOS／SEED光电子集成Crossbar互连网络的实现及控制

本文报道了光电子集成 Crossbar互连网络的光学实现及电控制方法。采用带光窗口的 CMOS/SEED灵巧像元列阵作为逻辑控制交换开关节点 ,输出光强的高低态对比度约为 1.4。由波长为 85 0 nm的半导体激光器发出的光束经过位相计算全息光栅分束器分束 ,形成 8× 2的光束阵列 ,为 CMOS/SEED光调制器窗口列阵提供泵浦光源 ,采用精密加工的高精度二维光纤阵列作为信号输入、输出接口器件。采用计算机并口产生电控制信号实现网络的交叉连接功能 ,编制了相应的控制软件。实验上完成了 16× 16 Crossbar光互连网络的交换功能     

Fault-Tolerant Multistage Interconnection Network

In this paper, a new fault-tolerant Banyan (FTB) network design is proposed. The rules to add extra hardware and links to the regular Banyan network in order to get the new FTB network are presented. The work includes a modular design for a new 2×2 switch element that can be configured in different well-defined modes. In case an error occurs in the function of a switch in the FTB network, the switch can be bypassed and other switch in the network replaces its role. The most attractive feature of the new design is that it can maintain the original (regular) Banyan topology in the presence of faults. Consequently, the system performance will not be affected due to the occurrence of tolerable faults in the interconnection network. This feature makes our design different from all fault-tolerant designs. Moreover, multiple faults can be tolerated in the proposed FTB network. The FTB network will be very powerful in safety critical systems and applications where error can lead to catastrophic events.     

深亚微米VLSI电路中互连线的几何优化设计

基于三维 L aplace方程的 Silvaco Interconnect3D模拟程序数值解 ,对互连寄生电容进行了计算 ,其结果用于 0 .2 5μm CMOS技术互连延迟及串扰的 SPICE模拟中。模拟结果表明 ,基于W/ P=0 .3～ 0 .4的布线准则可以获得最优的互连延迟与串扰 (Crosstalk)特性 ,通过优化互连线及驱动管的几何尺寸可以显著地减小互连线的延迟及串扰噪声。     

A New Architecture for Nonblocking Optical Switching Networks

With the current technology, all-optical networks require nonblocking switch architectures for building optical cross-connects. The crossbar switch has been widely used for building an optical cross-connect due to its simple routing algorithm and short path setup time. It is known that the crossbar suffers from huge signal loss and crosstalk. The Clos network uses a crossbar as building block and reduces switch complexity, but it does not significantly reduce signal loss and crosstalk. Although the Spanke's network eliminates the crosstalk problem, it increases the number of switching elements required considerably (to 2N ² - 2N). In this paper, we propose a new architecture for building nonblocking optical switching networks that has much lower signal loss and crosstalk than the crossbar without increasing switch complexity. Using this architecture we can build non-squared nonblocking networks that can be used as building block for the Clos network. The resulting Clos network will then have not only lower signal loss and crosstalk but also a lower switch complexity.