Optimization of a Dedicated Path Protected TDM/WDM PetaWeb Architecture

This paper deals with the insertion of a dedicated path protection strategy in the design of a novel optical network structure, called PetaWeb, that can reach a total capacity of several Pb/s (10 bit/s). Prior studies of the same authors have tackled the optimization of a PetaWeb network architecture with a regular composite-star topology and with a quasi-regular topology. In this paper, a protection strategy is added to the network model modifying the optimization algorithm. The results show that the optimized PetaWeb architecture is reliable and that every edge node is connected to at least two switching sites. We highlight the strength of the proposed network model for this composite-star architecture: a fast-switching backbone that eases signaling and switching operations at a competitive network cost. The network cost is evaluated on real physical costs and on a virtual cost due to lightpaths propagation delays.