Establishment of Dynamic Lightpaths in Filterless Optical Networks
Journal of Optical Communications and Networking
In this paper, we study the performance of dynamic routing and wavelength assignment (RWA) in filterless optical networks. These types of broadcast and select networks benefit from breakthroughs in advanced transmission technologies for replacing optical filters and active photonic switching devices, such as wavelength selective switches, with passive optical interconnections between nodes, creating passive optical light trees. We introduce an RWA scheme for establishing passive optical
... hs in a filterless context and managing unfiltered channels at intermediate egress nodes, which, by propagating downstream of the terminating nodes, participate in wavelength usage and increase the risk of wavelength exhaustion. Simulation results are presented for six network topologies, along with the performance evaluation of active photonic and filterless optical network solutions with static and dynamic RWA schemes. We show that the performance of the proposed scheme depends on the average degree of node connectivity. Index Terms-All-optical networks; Dynamic routing; Optical control plane; Physical layer aware routing; Routing and wavelength assignment algorithms. The main constraint in a filterless network lies in the presence of unfiltered channels propagating all the way to the terminating nodes of a filterless light tree as a result of the passive drop and continue feature of a filterless node. The concept of unfiltered channels, as well as their http://dx.