共查询到19条相似文献,搜索用时 125 毫秒
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本文以一个典型的光交叉连接(Optical Cross Connect,OXC)结构作为模型,对串扰的来源及其对信号输出功率的影响作了分析,并引入"功率代价"来衡量、比较相干串扰和非相干串扰对系统的影响;最后就如何改善系统的串扰提出了看法. 相似文献
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3R光电波长变换器对WDM网中串扰的影响 总被引:2,自引:1,他引:1
具有光叉连接(OXC)节点的波分复用(WDM)光网络中,串扰是一个重要的限制因素。本文针对基于分送耦合开关的OXC结构,分析了相干和非相干串扰引入的光功率恶化并进行了仿真计算。结果表明相干串扰是影响传输质量的重要因素,串扰引起的光功率恶化主要取决于复用波数M,而与输入光纤数N关系不大。如果在OXC节点内采用3R光电波长变换器(OEWC),串扰对系统的影响会降低。 相似文献
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光突发被认为是IPoverWDM的一种新探索,其节点中的串扰问题是一个重要研究课题,针对其中两种OBS节点交换结构,对其串扰进行了研究与分析并对其进行数值模拟,结果发现交换结构中各器件都不同程度的影响串扰,通过模拟发现带有波长变换器的OBS节点交换结构串扰相对低于不加波长转换器的,这些理论对以后光突发的研究具有指导意义。 相似文献
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光交叉连接器件(OXC)是实现WDM全光网络的关键器件,但由于其自身的链路和信号相互作用,会产生严重的串扰问题,从而限制了OXC性能的充分发挥.我们通过理论推导、数值计算和统计分析等方法对典型的OXC拓扑结构中的串扰进行了详细的定性和定量分析,并对OXC的扩展性和级联性进行了讨论. 相似文献
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WDM光网络中OXC结构对带内串扰积累的影响 总被引:1,自引:1,他引:0
串扰是波分复用(WDM)光网络中光交叉连接(OXC)投入实用的最大障碍。理论分析了基于扩展Benes(DB)结构和改进扩展Benes(GMDB)结构的3种典型OXC节点结构中的带内串扰,并数值模拟了基于两种结构的OXC节点中带内串扰的积累特性。结果表明,基于DB结构和GMDB结构的OXC节点可以完全消除低于二阶的各类串扰。发现基于GMDB结构的OXC节点能大大减少带内串扰的积累,与基于DB结构的OXC节点相比,基于GMDB结构的OXC节点对光开关串扰系数的要求放宽了5dB,说明OXC节点结构的选择对消除串扰尤为重要。 相似文献
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本文介绍了光交叉连接(OXC)节点在光网络中所处的位置,分析了透明OXC节点和非透明OXC节点两种结构的构成方式.同时分析了OXC节点的串扰性能和利用GMPLS协议实现OXC节点的控制方式. 相似文献
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分析了光网络中大功率信号引起的带内串扰攻击,攻击信号功率和光开光串扰系数是带内串扰攻击对用户信号质量产生破坏影响的主要因素.在VPI仿真软件中搭建实验系统,以误码率为评价指标,定量研究了带内串扰攻击对用户信号质量的影响及其攻击传播能力.结果表明,当光开关串扰系数为-20 dB、初始攻击信号功率高于用户信号功率20 dB以上时,在OXC1处,经过第一级和第二级光开关的用户信号会受到攻击影响,经过第三级光开关的用户信号几乎不受攻击影响.带内串扰攻击具有一定的攻击传播能力,当初始攻击信号功率高于用户信号功率27dB、光开光串扰系数为-20 dB时,初始攻击信号的攻击能力可传播至OXC3,同时,二阶攻击信号基本不具备攻击传播能力. 相似文献
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The performance of current optical networks is inherently limited by the speed of electronic components and, in particular, by electronic switches. A new generation of optical networks, referred to as all-optical networks, overcomes this limitation by switching data entirely optically using all-optical crossconnects (OXCs). However, all-optical networks are prone to phenomena that are unknown to current optical networks with electrical regeneration: OXCs are subject to optical leaks, called crosstalk, resulting in unwanted components being added to transmitted signals, and this crosstalk is transmitted over very long paths without any signal regeneration. In this paper, we consider the interplay between fiber nonlinearity and crosstalk signals over long distances as the source of performance degradation, measured in terms of Q factor. We present an analytical crosstalk model for all-optical networks and give expressions for the performance degradation resulting from the joint propagation of a signal [using a continuous-wave (CW) assumption and perturbation theory] and crosstalk in large networks. Analytical calculations required by this model are shown to be much less computationally intensive than simulations. Simulations are carried out to validate our analytical model and good agreement is found between the analytical model and simulations for wide ranges of parameters. 相似文献
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波分复用环网中带内串扰的分析与实验论证 总被引:1,自引:0,他引:1
本文分析了波分复用(WDM)全光通信环网中串扰起因,指出WDM环网中的串扰分析可以简化单一串扰源的情况。从接收机检测光电流的概率分布函数出发,给出了一单串扰源的精确误码率表达式,串扰功率代价的分析结果与论证实验的测量非常吻合。 相似文献
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在波分复用(WDM)系统中不同信道之间的串扰将恶化每路信号的消光比,而多波长光交叉连接网络中还会出现带内串扰的情况,它所产生的拍频噪声对系统的影响远大于带间串扰。从不同的角度分析了这两种串扰,理论分析的结果与实验现象吻合良好。 相似文献
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As the number of wavelengths in a single optical fiber increases, so does the number of ports needed for wavelength switching
in optical cross-connects (OXCs), which may significantly increase the cost and difficulty associated with controlling large
OXCs. Waveband switching (WBS) treats several wavelengths as a bundle that is switched through a single port if they share
the same switch route, so that the number of ports needed can be reduced. On the other hand, light-trails in wavelength division
multiplexing (WDM) optical networks allow intermediate nodes on established optical paths to access the data paths whereas
light-paths only allow two end nodes to access the data paths. Therefore, light-trails offer significantly better flexibility
for service provisioning and traffic grooming. In this article, we study service provisioning using light-trails in WDM optical
networks with the WBS capability under a static traffic model. For comparison, integer linear programs are formulated for
establishing light-trails with and without WBS. Numerical studies show that in certain cases, service provisioning with WBS
in light-trail networks can reduce the number of ports needed while providing a more flexible sub-wavelength service provisioning
capability. However, contrary to intuition, in most cases applying the WBS technique requires more ports in OXCs in light-trail
networks. This study provides insights into the network design problem that applies the WBS technology to light-trail based
optical networks. 相似文献
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《Circuits and Devices Magazine, IEEE》2004,20(2):32-37
This article has focused on optical networks using WDM to provide broadband network solutions with increased functionality, capacity, and reach. The building blocks in this type of networks, i.e., OADMs and OXCs, have been discussed in detail. The different architectures and technology options used in these types of nodes have been investigated. A comparison between WS and BS OADM architectures has been given, while OXCs have been classified into opaque and transparent. The WS and B&S transparent OXC architectures have been discussed in detail, and the various technology options in terms of optical switching have been covered. The system performance of OADMs and OXCs including their cascadability has been analyzed in terms of OSNR, crosstalk, amplifier transients, and filter concatenation effects. 相似文献
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