Enhancements to multi-protocol lambda switching (MPλS) to accommodate transmission impairments

We consider networks consisting of optical cross-connects interconnected via fiber optic links and controlled by IP routes. Optical connections are provisioned dynamically and on demand as the need for them arises due to changes in the traffic. We discuss the impact of linear effects such as polarization mode dispersion (PMD) on the design of the control plane. Constrained-routing algorithms as well as signaling protocols are developed which allow for proper label (lambda) and regeneration requests distribution. Both the architecture and the electronic equipment cost are validated, through simulation, using a new WDM-aware version of NS-2 simulator. Simulation results reveal that: (1) the feasibility of the lightpath is greatly affected by the PMD factor, especially for bit-rates exceeding 5Gbit/s; and (2) significant improvement (in terms of cost) can be achieved through intelligent route selection schemes which take into consideration physical characteristics of fiber links. These cost savings are more apparent in networks with non-homogeneous fiber quality