光突发交换与下一代互联网

光突发交换与交换粒度介于光电路交换（即波长交换）和光分组交换之间的一种光交换模式，因为它克服了光电路交换和光分组交换的缺点，具有很大的技术优势，很有可能成为下一代互联网骨干网络的核心技术，真正实现光子互联网。本介绍光突发交换技术的基本原理，讨论了光突发交换的协议，突发封装和在IP骨干网中的应用等问题，并指出在这项技术得到应用之前需要解决的诸多课题。     

下一代网络与光交换

文章简述了用于下一代网络的交换技术,重点介绍了光交换技术,包括光分组交换、光突发交换与多协议波长交换.     

光突发交换中信令协议的研究

光突发交换(OBS)技术是近几年出现的一种新型光交换技术,其交换单元粒度中等,结合了光线路交换和光分组交换的优点,并克服了它们的部分缺点,与当前技术发展相适应。详细介绍了OBS技术中所采用的几种信令协议,并对它们进行了比较分析。     

OBS与LOBS的关系与实现

本文介绍了光突发交换的基本概念,JET协议下光突发交换,以及对核心节点、边缘节点的初步介绍。从文中可以看到JET协议下的光突发交换特点,核心节点、边缘节点在光突发交换中的作用。而标签突发包交换是一种基于光突发交换的新技术,本文将对此新技术进行讨论。     

OBS与LOBS的关系与实现

本介绍了光突发交换的基本概念，JET协议下光突发交换，以及对核心节点、边缘节点的初步介绍。从中可以看到JET协议下的光突发交换特点，核心节点、边缘节点在光突发交换中的作用。而标签突发包交换是一种基于光突发交换的新技术，本将对此新技术进行讨论。     

LOBS网络的QoS分析

网络的服务质量(QoS)是下一代IP over WDM光因特网中一个很重要的问题。光标签突发包交换技术(LOBS)作为一种新出现的光交换技术,必须支持QoS。文章主要介绍了LOBS网络的特点,并回顾和总结了已有的光突发交换(OBS)网络QoS方案,讨论了在LOBS中的QoS准则。     

光突发交换中的路由技术

光突发交换是面向下一代因特网的光交换模式,是光电路交换和光分组交换的有效折衷方案,避免了各自的缺点.它使用的带宽粒度介于光电路交换和光分组交换之间,比光电路交换灵活,带宽利用率高,比光分组交换易于实现,是很有发展前途的光交换技术.路由技术在光突发交换中起重要作用,在很大程度上影响着光突发交换网络的性能.本文首先介绍了光突发交换技术的原理,然后分析了光突发交换技术的现状及存在的问题,最后探讨了光突发交换中的路由技术及其发展.     

光标签突发包交换技术

光标签突发包交换是一种新出现的光交换技术。它把基于标签转发的速度优势、QoS(服务质量)保证及流量工程与光突发包交换控制机制(更长的转发数据单元、光网络边缘缓存、带外信令控制)结合起来。全面介绍了这种光交换技术，重点描述了其网络结构。另外，还对其所涉及到的关键技术进行了讨论，并结合下一代互联网的技术趋势，对光标签突发包交换的前景进行了评价。     

基于GMPLS的光突发交换网络的研究

作为下一代互联网关键技术之一的光突发交换(OBS)技术已经受到业界的广泛关注.但是在网络中还需要一个成熟的控制面技术支持,为此提出了了基于GMPLS控制面的OBS网络体系,并对GMPLS体系结构的关键技术进行了介绍.     

光突发数据包整合技术的研究

光突发交换是适合在当前技术条件下的新交换技术，它比电路交换灵活，带宽利用率高，又比光分组交换易于实现，将成为下一代光IP骨干网的核心技术。介绍了控制分组结构。重点研究了光突发交换的关键技术—突发数据包整合技术的各种方法，指出突发数据包整合技术在很大程度上影响着光突发交换网的性能。     

Performance evaluation of a new technique for IP support in a WDMoptical network: optical composite burst switching (OCBS)

The optical composite burst switching (OCBS) technique is proposed to be implemented in an all-optical backbone network to support Internet protocol (LP) traffic. The OCBS is based on two main features. First, several IP packets are assembled in a single macropacket, called burst. Second, the burst contention in an optical switch is handled by means of two techniques, the wavelength dimension and the burst-dropping (BD) technique. Different from traditional optical burst switching, where an entire burst is discarded when all of the output wavelengths are engaged at the arrival instant of the burst, a switch adopting the BD technique discards only the initial part of a burst finding all of the engaged output wavelengths while forwarding the final part of the burst, beginning at the instant in which one wavelength becomes free. The OCBS allows an increase in the switch throughput in terms of number of accepted IP packets because a burst contains a given number of IP packets. We introduce the analytical model that allows us to evaluate the effectiveness of the technique and, in particular, the obtained saving; furthermore, a sensitivity analysis of the saving, with respect to both the optical burst switch parameters and the traffic load, is carried out     

Development of a Thermal Switch Using the Channel Geometry Effect for Electronic Packages

This paper presents development of a thermal switch using the channel geometry effect for electronic packages operated via liquid conduction channel formation. The developed switch panel is composed of several conduction channels, breathing grooves, reservoirs, and actuators. On demand, a vacant conduction channel is filled with liquid supplied by an actuator and conducts heat from hot spots to cold. This result in increased heat dissipation. Through this switch operation, the temperature of the designated hot spot can be controlled locally. In order to realize the desired switch operation of liquid contact and separation properly, with liquid supplied from a reservoir and returning to the reservoir, the liquid column should be precisely controlled based on the channel design. The conduction channel has a burst area to achieve the precise liquid control. The burst area was geometrically designed to provide a hydrophilic surface by taking into account the burst pressure. In a series of experiments, the newly designed switch was shown in controlling the liquid column well. The results also showed that this thermal switch was able to regulate the heat flow and the temperature distribution locally through the achieved liquid column control.      

High repetition rate burst-mode spark gap

Results are presented on the design and testing of a pressurized gas blown spark-gap switch capable of high repetition rates in a burst mode of operation. The switch parameters which have been achieved are as follows: 220 kV, 42 kA, a five-pulse burst at 1 kHz, 12-ns rise time, 2-ns jitter at a pulsewidth of 50 ns.     

Optical Burst Switching With Large Switching Overhead

To date, optical burst switching (OBS) schemes assume the switch reconfiguration time to be negligible, a part of the processing delay of the control packet, or a fixed value added to the data burst length, regardless of the switch status. In this paper, we show that the switching overhead can have a significant impact on the performance of some OBS channel scheduling schemes. We have also proposed methods to alleviate the problem     

光突发交换中的突发业务流模型及其应用

提出了一种光突发交换中的突发业务流模型,采用该模型对光突发交换中的LAUC-VF输出调度算法在不同的突发业务强度和突发长度下的性能进行了模拟仿真,分析比较了该算法在此突发业务流和普通业务流模型下的性能,仿真结果表明,该突发业务流模型具有一定的合理性。     

Performance of fully variable demand assignment SS/TDMA satellite systems

Fully variable demand assignment in a SS/TDMA satellite system requires frequent burst time plan changes with reconfiguration of the on-board switch matrix state sequence. The burst managment presented in this paper assumes that bursts are not reconfigurated into new bursts during such burst time plan changes but merely shifted in time. The performance of this burst management procedure as obtained from simulations over three different networks is reported in terms of throughput gains, required signalling capacity and time required to change burst time plan.     

Demonstration of connection-oriented optical burst switching network utilising PLC and MEMS switches

The first demonstration of a connection-oriented optical burst data switching network constructed with PLC and MEMS switches employing GMPLS control is reported. Optical burst data switching in a six-node photonic network using the general switch management protocol (GSMP) is successfully, demonstrated.     

OBS环网竞争解决办法的分析和比较

在光突发交换(OBS)基本概念的基础上,针对OBS网络,特别是OBS环网突发包竞争引起的突发包丢包等问题,介绍和比较了OBS网络中常用的突发包竞争解决办法.重点分析了几种适用于OBS环网的常用突发包竞争解决办法对网络吞吐量等主要性能的影响,指出了采用这几种竞争解决办法的网络的性能优劣,归纳总结了它们的优缺点.     

激光触发GaAs光电导开关非线性现象的实验研究

实验研究了光电导开关的非线性现象,结果表明用半导体激光脉冲串触发光电导开关,在保持激光触发GaAs光电导开关实验条件不变的情况下,产生非线性的电阚值会不断降低.测量和比较试验前后光电导开关暗电阻,初步表明产生非线性的电阈值降低,是光电导开关因光照和产生非线性引起内部材料物理机制发生变化所致.     

Delay performance of some scheduling strategies in an input queuingATM switch with multiclass bursty traffic

Considers an N×N nonblocking, space division, input queuing ATM cell switch, and a class of Markovian models for cell arrivals on each of its inputs. The traffic at each input comprises geometrically distributed bursts of cells, each burst destined for a particular output. The inputs differ in the burstiness of the offered traffic, with burstiness being characterized in terms of the average burst length. We analyze burst delays where some inputs receive traffic with low burstiness and others receive traffic with higher burstiness. Three policies for head-of-the-line contention resolution are studied: two static priority policies [shorter-expected-burst-length-first (SEBF), longer-expected-burst-length-first (LEBF)] and random selection (RS). Direct queuing analysis is used to obtain approximations for asymptotic high and low priority mean burst delays with the priority policies. Simulation is used for obtaining mean burst delays for finite N and for the random selection policy. As the traffic burstiness increases, the asymptotic analysis can serve as a good approximation only for large switch sizes. Qualitative performance comparisons based on the asymptotic analysis are, however, found to continue to hold for finite switch sizes. It is found that the SEBF policy yields the best delay performance over a wide range of loads, while RS lies in between. SEBF drastically reduces the delay of the less bursty traffic while only slightly increasing the delay of the more bursty traffic. LEBF causes severe degradation in the delay of less bursty traffic, while only marginally improving the delays of the more bursty traffic. RS can be an adequate compromise if there is no prior knowledge of input traffic burstiness