Recovery time of degraded throughput in best-effort CWDM networks with ROADMs

Congestion removing performance has been investigated in IP-over-CWDM networks with ROADMs under the best-effort transmissions specified by the service level agreement (SLA). Two approaches were tried to remove congestion, and the experimental results clarified that the approaches could remove congestion by adding a lightpath automatically or adding a static bypass route automatically. The degraded throughput was recovered within a recovery time specified by the SLA. As a result, the static bypass route approach can provide fine granularity adjustment of traffic to be switched without lightpath reconfiguration, and the lightpath adding approach can provide effective adjustment of larger traffic than in the static bypass route approach.