QoS-Aware Wavelength Assignment With BER and Latency Constraints for All-Optical Networks

Physical impairments originating from optical fiber components and intermediate switching nodes can be the dominant reason calls are blocked in wide-area all-optical wavelength division multiplexing (WDM) networks. When a centralized network controller is used, estimating the impact of the physical impairments on the quality of a lightpath before provisioning it can cause a significant delay. In this paper, quality of service aware wavelength assignment algorithms are proposed that consider both bit-error rate (BER) and latency constraints. A novel wavelength assignment technique calledwavelengthorderingis shown via simulation to reduce the call blocking probability resulting from both physical impairments and excessive processing delay caused by channel BER estimation.