Congestion removing performance in IP-over-CWDM networks with stackable ROADMs

Congestion removing performance has been investigated and evaluated in an experimental IP-over-CWDM network with Stackable ROADMs (S-ROADMs) to be applicable to campus networks, large-scale LANs and other local networks. The evaluated performance includes congestion removing by adding a static bypass route without lightpath reconfigurations. The evaluated performance also includes congestion removing under making multi lightpaths by adding a new lightpath between congested nodes by the S-ROADMs. The experiments clarified that congestions were removed successfully by both approaches. The static bypass route approach can provide fine granularity adjustment of traffic to be switched without lightpath reconfiguration, and multi lightpath approach can provide effective adjustment of larger traffic than in the static bypass route approach, i.e. the case when the capacity equal to almost one lightpath is required to remove the congestion. Thus, the combination of the 2 approaches enables the network administrators to remove congestions, which require from small to large capacities.