Performance Analysis on Negligible Blocking DC-based Optical Switching Networks Under Crosstalk Constraint
Performance Analysis on Negligible Blocking DC-based Optical Switching Networks Under Crosstalk Constraint
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发表时间：
2006
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通讯作者：
Chen Yu;Y. Inoguchi;S. Horiguchi
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作者：
Chen Yu;Y. Inoguchi;S. Horiguchi
榕树网络具有深度小、信号损耗绝对均匀等优点，是一种很有吸引力的光开关结构。榕树结构是一种基于定向耦合器（DC）的开关系统，可以以每秒几个太比特的速率切换信号。尽管有许多优点，但光榕树网络存在固有的串扰问题，在构建鲁棒的交换系统时必须克服该问题。光榕树网络的多个副本的垂直堆叠是构造无阻塞光交换网络的一种新方案。所得到的网络，即垂直堆叠的光学榕树（VANES）网络，保留了榕树网络的所有属性，但在一阶无串扰约束下，显着增加了硬件成本。阻塞行为分析是研究网络性能，在硬件开销、串扰容忍度和阻塞概率之间寻求最佳折衷的有效方法。很少有人知道在分析阻塞行为，在这样的VPERS网络与一定程度的串扰约束。在本文中，可忽略阻塞的VEGF-N网络的各种小程度的串扰约束下的实现将被提交。我们发现如何串扰增加了一个新的层面上的性能分析的一个Vendor网络。我们实现了阻塞概率的可能上界，它可以描述VPENN网络中的整体阻塞行为。本文的数值结果可以指导网络设计者在Banyan网络的垂直副本中找到阻塞概率、串扰程度和硬件成本之间的折衷。
Summary Banyan networks are attractive for serving as the optical switch architectures due to their nice properties of small depth and absolutely signal loss uniformity. Banyan structure is one of the candidates for serving as the directional-coupler (DC)-based switching systems that can switch signals at the rate of several terabits per second. Despite many advantages, optical banyan networks suffer from an intrinsic crosstalk problem that must be overcome in building a robust switching system. Vertical stacking of multiple copies of an optical banyan network is a novel scheme for building nonblocking optical switching networks. The resulting network, namely vertically stacked optical banyan (VSOB) network, preserves all the properties of the banyan network, but increases the hardware cost significantly under first order crosstalk-free constraint. Blocking behavior analysis is an effective approach to studying network performance and finding a graceful compromise among hardware cost, crosstalk tolerance and blocking probability. Little is known on analyzing the blocking behavior in such VSOB networks with some degree of crosstalk constraint. In this paper, the implementation of constructing negligible blocking VSOB networks under various small degree crosstalk constraints will be presented. We find how crosstalk adds a new dimension to the performance analysis on a VSOB network. We implement the possible upper bound on blocking probability which can describe the overall blocking behavior in VSOB networks. The numerical results implanted in the paper can guide network designer in finding the tradeoff among the blocking probability, the degree of crosstalk and the hardware cost in terms of vertical copies of Banyan network.