An OSNR-based Master-slave Disjoint Routing Optimization Algorithm

At present, in the OTN (optical transmission network) route planning, most of the primary routes are mainly shortest paths, and the alternate routes are mainly the second shortest paths. Once common links or devices fail, it is easy to increase the risk of network operation. Aiming at this problem, this paper proposes an algorithm, the optimizing target of which is minimizing the intersection degree of the active and alternate routes of the whole network. The OSNR is closely related to the network transmission quality. The lower the OSNR, the higher the bit error rate. If the OSNR is below the threshold, the optical channel cannot be opened. Considering the active and alternate routing time delay, the intersection of the active and alternate routes and OSNR, the algorithm establishes the service routing planning algorithm model with the OSNR, optical power, and the number of each optical link bearer services. Finally, it is verified that the mechanism can reduce the intersection degree of active and alternate routes of the whole network while ensuring the OSNR and the number of optical link bearer services is secure, thereby reducing the risk of network operation.