Efficient management of wavelengths resources in WDM networks using common - Wavelengths design scheme

The self-healing capability to recover from network failures is one of the most important features for WDM optical networks. One problem in realizing such survivable WDM networks is the inefficient utilization of large spare resources (wavelengths) designed for restoration of the failed traffic, which might not happen frequently. We study "common - wavelengths" design scheme to increase the utilization efficiency of these resources. The "common - wavelengths" is an approach that allows some working paths under the failure to efficiently use the available common-wavelengths in the network. However, this approach might degrade the QoS of some low priority class demands. Thus, the survivable WDM networks can be cost effectively designed according to the reliability levels of all working paths in the network.