Journal of Computing
Wavelength Division Multiplexing (WDM) is the technology currently deployed to increase transmission bandwidth in optical networks. In transparent optical networks, signals can propagate over long distances without electrical regeneration, causing physical layer impairments to accumulate and make lightpaths' Quality of Transmission (QoT) become potentially unacceptable. Depending on the channel load and transmission distance some paths cannot be set up fully transparently because the transmission quality requirements cannot be fulfilled. This result might have a severe consequence on the performance of all-optical networks especially in terms of rejection ratios.