Panos Papanikolaou

University of Patras | UP · Department of Computer Engineering and Informatics

As optical networks become increasingly flexible and software driven, network operators need to reconsider their present mode of network planning and operation, which traditionally relies on long planning periods, performed independently for the IP edges (logical topology) and the optical transport layer (physical topology). Network planning assumi...

Traditionally, network upgrade cycles are long and performed independently for the IP edges and the optical transport layers. The traffic in metro and core networks is forecasted to grow in volume but also in dynamicity and the network operators face the challenge of shorter upgrades, influencing the cost efficiency and suppressing the return of in...

The traffic in metro and core networks is forecasted to grow in volume but also in dynamicity. Network operators dimension their optical networks and their IP edges for the expected traffic peak, and also reserve additional resources for the required survivability level. The latter is typically done by protection mechanisms at the optical or IP lay...

We formulate the joint multilayer planning problem of survivable elastic networks and present two ILP formulations to solve it. Compared to the traditional dual plane planning approach significant cost and energy savings can be achieved.

The traffic in metro and core networks is forecasted to grow in volume but also in dynamicity, and the inefficiency of WDM optical networks drove research efforts on flex-grid technologies. Flex-grid networks support variable spectrum connections as a way to increase spectral efficiency and support future transmission rates. In addition, the use of...

Core networks offer high capacities, thanks mainly to the optical technologies they utilize, but they consume a non-negligible amount of energy. The traffic volume in metro and core networks is forecast to grow at very high rates, exceeding 30% per year for the next five years, and if the corresponding energy requirements grow analogously, they wil...