Energy efficient algorithm with considering port-cost in hybrid hierarchical optical networks

In recent years, as the increasing effect of greenhouse and extremely consumption of worldwide energy, port-cost and energy-consumption savings are becoming a dual of new objectives of further developing an optical network. Using hybrid technology to replace Optical-Electrical-Optical (OEO) fabric with an all optical (OOO) one to save more consumed energy and using hierarchical technology to aggregate several wavelengths into wavebands to perform port-cost savings is an attractive solution for next-generation optical networks. In this paper, we jointly consider port-cost and energy-consumption in hybrid hierarchical optical network and develop efficient approaches ranging from Integer Linear Programming (ILP) models to heuristics. Simulation results of two heuristic approaches show that, the cost of Transmitting Ports (TPs) used in OOO switch is contrary to the energy consumed by OEO part of hybrid hierarchical Optical Cross Connect (OXC) node, and it is necessary to make a new design to obtain satisfactory trade-off performance.