Finding WDM Network Topographies that are Nonblocking without Wavelength Interchange

寻找无波长交换的无阻塞 WDM 网络拓扑

• 批准号: 1307643
• 负责人: Richard Thompson
• 金额: $ 4.56万
• 依托单位: University of Pittsburgh
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2013
• 资助国家: 美国
• 起止时间: 2013-03-01 至 2014-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1307643&HistoricalAwards=false
• 关键词: Finding; WDM; Network; Topographies; Nonblocking

Modern long-haul optical networks are capable of carrying a wavelength of light (a lambda or an optical circuit) and its associated bit stream thousands of kilometers without regeneration, conversion from an optical signal to an electrical one and back again (OEO). This long-haul technology has substantially reduced the cost of optical systems since OEO regeneration has traditionally been expensive. It has also offered the (as yet unrealized) promise of running multiple data formats. However, when two lambdas of the same wavelength need to be inserted onto the same optical fiber at least one of them must undergo OEO in order to change its wavelength. This is called wavelength interchange. The problem of routing and wavelength assignment (RWA) to minimize the number of wavelength interchanges has been deeply studied.This project will study a different question: what types of topologies minimize the need for wavelength interchange? This question is expected to lead to graph properties that minimize the need for wavelength interchange in physical networks. By taking a different approach to understanding the minimization of wavelength interchange the project couples the RWA problem to issues of network design. In turn this allows questions of network resilience to be coupled to questions of optical-layer design. Long-haul optical networks are a foundational element of the modern economy. Both network cost minimization and network flexibility and resilience are concerns affecting our national interests.

现代长途光网络能够将一定波长的光（lambda 或光路）及其相关比特流传输数千公里，无需再生、从光信号到电信号的转换（OEO）。 这种长距离技术大大降低了光学系统的成本，因为 OEO 再生传统上非常昂贵。 它还提供了运行多种数据格式的（尚未实现的）承诺。 然而，当需要将两个相同波长的λ插入到同一光纤上时，至少其中之一必须经过OEO才能改变其波长。 这称为波长互换。 为了最大限度地减少波长交换的次数而进行的路由和波长分配（RWA）问题已得到深入研究。该项目将研究一个不同的问题：什么类型的拓扑可以最大限度地减少波长交换的需要？ 这个问题预计将导致图特性最小化物理网络中波长交换的需要。 通过采用不同的方法来理解波长交换的最小化，该项目将 RWA 问题与网络设计问题结合起来。 反过来，这使得网络弹性问题与光层设计问题相结合。长途光网络是现代经济的基本要素。 网络成本最小化和网络灵活性和弹性都是影响我们国家利益的问题。