Design of robust WDM networks

光网络利用高速宽带光纤的互连，通过光发射器和光接收器来传输信息。波分复用（WDM）允许在一根光纤上以不同的载波频率运行多个通信信道。快速增长的WWW至关重要地依赖于快速可靠的通信。WDM网络的日益复杂，使得网络故障的可能性成为一个非常重要的问题。即使是短暂的数据通信中断也意味着大量数据的丢失。在本研究中，我们将研究以下有关网络生存性和光网络设计的问题：—在设计网络时，如何确保使用尽可能少的额外资源来处理任何单个故障？—如何设计网络，当发生故障时，使用备份路径的通信可以非常快地恢复？—如何以经济的方式将低速用户的通信需求分配给高速光通信？

Optical networks use interconnections of high-speed broadband fibers to transmit information using optical transmitters and receivers. Wavelength Division Multiplexing (WDM) allows multiple communicationchannels to operate at different carrier frequencies on a single fiber. The rapidly growing WWW is crucially dependant on fast and reliable communication. The growing complexity of WDM networks makes the possibility of faults in networks a very important problem. Even brief interruption of data communication represents the loss of a huge amount of data.  In this investigation, we will look at the following problems on network survivability and the design of optical networks:- When designing a network, how to ensure that any single fault can be handled using as little additional resources as possible?- How to design networks in such a way that, when a fault occurs, communication using an backup path can be resumed very fast?- What is an economical way to allot low-speed user requests for communication to the high-speed capability of optical communication?