| Wavelength-division multiplexing (WDM) technology allows an aggregate traffic on the order of Tbps to be carried on a single fiber, with each wavelength carrying traffic in the tens of Gbps order. However, the traffic requirements of most Internet applications are at much lower granularity compared with the extremely high bandwidth provided by WDM optical networks. Therefore, in order to utilize the network resources efficiently, a number of flows from multiple network connections with sub-wavelength granularities may be packed onto the same wavelength channel. This process refers to as traffic grooming.;The first part of this thesis is to address traffic grooming problem on unidirectional WDM ring networks. In particular, we will address the many-to-many traffic grooming using network coding in order to reduce overall network design cost comparing to traditional traffic grooming schemes. The second part of this thesis is to address network survivability problems. Network survivability, defined as networks' ability to continue functioning correctly in the presence of failures of any network components, is an important requirement for WDM optical networks due to their ultra-high capacity. A single failure can disrupt millions of applications and results in tremendous revenue loss to both end users and network operators. Although many network components can cause the failure of a connection, such as fibers, switches, transceivers and so on, the most common network failure is the link failure and most likely it is the fiber cut because of construction and dig up. Therefore, link failures will be the only failure event considered in our study. We will address both unicast and multicast protection problems in WDM mesh networks and propose a number of protection schemes against single and double link failure scenarios. Two critical performance criterion, capacity efficiency and traffic recovery time, which have an intrinsic trade-off, will be studied for each proposed protection approach. |
