Priority-rotating DBA with adaptive load balance for reconfigurable WDM/TDM PON

• A priority-rotating DBA for reconfigurable WDM/TDM PON is proposed.
• A new SWA module is designed to implement wavelength sharing.
• An active RN is added in the WDM/TDM PON to support traffic redirection.
• Adaptive load balance over wavelengths and among ONUs are achieved.

To the wavelength-division multiplexing/time-division multiplexing passive optical network (WDM/TDM PON) architecture that implements wavelength sharing and traffic redirection, a priority-rotating dynamic bandwidth allocation (DBA) algorithm is proposed in this paper. The priority of each ONU is set and rotated to meet the bandwidth demand and guarantee the fairness among optical network units (ONUs). The bandwidth allocation for priority queues is employed to avoid bandwidth monopolization and over-allocation. The bandwidth allocation for high-loaded situation and redirected traffic are discussed to achieve adaptive load balance over wavelengths and among ONUs. The simulation results show a good performance of the proposed algorithm in throughput rate and average packet delay.