Optical WDM Networks with Limited Wavelength Conversion

一个重要的光网络体系结构是支持光路的波分复用(WDM)网络。WDM基本上是光频率范围内的频分多路复用，其中载波频率被称为波长。光路是由连接的WDM通道组成的端到端连接。如果网络节点能够移动光信号的波长，则称其具有波长转换能力。波长转换的优点是它允许网络支持更多的光路径，但它的缺点是它可能昂贵和/或难以实施。这项研究将研究有限的波长转换，允许网络节点执行部分但不是所有的波长转换。与完全转换相比，有限转换意味着更少的复杂和成本更低的硬件，但比不转换更好的通道利用率。网络体系结构和算法将通过最初关注特殊而重要的网络拓扑(如星形和环状)，然后最终覆盖一般网络拓扑来学习。这些将通过导致有保证的性能结果的最坏情况分析以及概率方法进行分析评估。有关该项目的更多信息，请访问http://spectra.eng.hawaii.edu/~sasaki/NSF/limited.html。

An important optical network architecture is the wavelength division multiplexed (WDM) network that supports lightpaths. WDM is basically frequency division multiplexing in the optical frequency range, where carrier frequencies are referred to as wavelengths. Lightpaths are end-to end connections made up of connected WDM channels. A network node is said to have wavelength conversion capability if it can shift the wavelengths of optical signals. The advantage of wavelength conversion is that it allows networks to support more ligthpaths, but its disadvantage is that it can be expensive and/or difficult to implement. This research will investigate limited wavelength conversion that allows network nodes to perform some but not all wavelength shifts. Limited conversion means less complex and costly hardware than full conversion, yet better channel utilization than no conversion. Network architectures and algorithms will be studied by initially focusing on special and important network topologies such as the star and ring, and then eventually covering general network topologies. These will be analytically evaluated by worst case analysis that leads to guaranteed performance results, and also by probabilistic methods. More information on the project can be found at http://spectra.eng.hawaii.edu/~sasaki/NSF/limited.html