Method of Optical Grooming for Distance-adaptive and Effective Sharing Path-aware

In order to address the problem of reducing the resources of transponder and spectrum in flexible grid optical networks, a lightpath circle mechanism is studied for many-to-many multicast requests, and a method of optical grooming is proposed based on distance-adaptive and effective sharing path-aware. By designing a strategy of traffic pre-processing based on distance-adaptive, a lightpath circle is constructed according to the distribution characteristics of member nodes and the distance-adaptive criterion in the proposed method. In the process of routing and spectrum allocation, by constructing a decision matrix oriented optical grooming and a priority scheduling vector, the multicast request is groomed into the established traffic with the highest effective sharing links. Moreover, the appropriate spectrum resources are allocated for the groomed requests to increase the success rates of grooming and to save the resources of transponder and spectrum. Simulation results show that the proposed method can significantly reduce the number of traffic consumed transponders and sub-carriers.