A Generalized Approach to WDM Optical Switched Networks

摘要：Chlamtac，Imrich NCR-9406522马萨诸塞州大学WDM光分组交换网络的通用方法： 第三代“全光”网络被提倡通过绕过电子设备的速度限制而产生近四个数量级的容量增加。在光分组交换网络中，有必要有一种方法来光学地处理当多个分组同时竞争关键光网络资源时发生的基本资源竞争问题。这些可以是发射器、接收器、开关和通道。为了实现光纤的光学容量，即，为了消除电子瓶颈，必须以在光域中保持分组流过网络的方式来解决资源争用。 一种可能的解决方案是基于使用光开关和光纤延迟线来实现称为开关延迟线（SDL）的全光开关。 这种方法的优点是相对简单，实施潜力和出色的性能。 本研究的目标是将上述解决方案扩展到波长敏感开关的情况，针对新兴的基于WDM的通信环境。 初步结果表明，SDL WDM解决方案可以提供：1）光WDM分组交换传输; 2）使用基于少量延迟线的有吸引力的硬件设计，最小功能开关，用WDM滤波代替快速可调谐性; 3）容错;以及4）可行的电子控制。 本文的研究成果有望为下一代光分组交换局域网/城域网WDM网络奠定基础。因此，它将使得能够在LAN和MAN通信系统中使用WDM来将多个高速数据流复用到光纤上，而不需要不切实际的并行电子处理。 因此，光网络的吞吐量潜力可能会增加几个数量级，为未来的应用铺平道路。

ABSTRACT: Chlamtac, Imrich NCR-9406522 University of Massachusetts A Generalized Approach to WDM Optical Packet Switched Networks: Third generation "all-optical" networks are advocated to yield a nearly four orders of magnitude capacity increase by circumventing the speed limitations of electronics. In an optical packet switched network it is necessary to have a methodology to deal optically with the fundamental resource contentions problem occurring when multiple packets are concurrently vying for key optical network resources. These can be transmitters, receivers, switches, and channels. To realize the optical capacity of the fiber, i.e., eliminate the electronic bottleneck, resource contention must be resolved in a way which maintains packets flowing through the network in the optical domain. One possible solution is based on the use of optical switches and fiber delay lines to realize an all-optical switch termed Switched Delay Lines (SDL). Among the advantages demonstrated for this approach are its relative simplicity, implementation potential and excellent performance. The goal of this research is the extension of the above solution to the case of wavelength sensitive switches, targeted towards the emerging WDM based communications environment. Preliminary results show that an SDL WDM solution can offer: 1) an optical WDM packet switching transmission; 2) use of attractive hardware design based on small number of delay lines, minimal functionality switches, replacement of fast tunability by WDM filtering; 3) fault tolerance; and 4) feasible electronic control. The research results of this study can be expected to lay a basis for the next generation optical packet switched LAN/MAN WDM networks. It will thus enable the use of WDM in LAN and MAN communication systems for multiplexing several high speed data streams onto the optical fiber, without requiring unrealistic parallel electronic processing. As a result, the throughput potential of optical networks may be increased by orders of magnitude paving the way for future applications.