Abstract:

Optical networks, driven by the rapid development of the broad band business, tend to be of large capacity and high rate. However, the complexity of optical networks topologies and the business deployment, together with the feature of NP-completeness make multi-link faults location difficult in a transparent optical network. How to diagnose the accurate faults number and location without doubt is becoming an intractable problem. We have studied the uncertain relationship between alarms and fault in all optical networks. A multi-link fault location model in an entire transparent optical network is established. Then we advance two heuristic fault location algorithms based on the credibility mode above, which could measure the credibility of multi-link faults location reasoning process according to alarms quantificational. Finally, we build up a simulation system to simulate the network model and fault propagation model in entire optical networks and obtain the fault location module to verify the correctness of multi-link faults location model based on credibility and the performance faults location of two algorithms. Simulation results show that the model solves the uncertainty of the fault location effectively, and two algorithms display the good performance on the accuracy of fault location.

Key words: all optical networks, fault location, uncertainty, credibility