2013 Volume 2 Issue 12 Pages 524-529
At dynamic wavelength allocation (DWA) to optical network units (ONUs) in wavelength-tunable (λ-tunable) wavelength-division-multiplexing/time-division-multiplexing-passive optical networks (WDM/TDM-PONs), consistency between the start time of the wavelength tuning and the upstream grants that are already allocated must be considered. This paper proposes a DWA method that is fully consistent with the dynamic bandwidth allocation (DBA) grant. By inserting a non-allocation period in which the upstream burst signals are halted from reaching the optical line terminal (OLT), the proposed method achieves consistency in a simple manner on the OLT side. Theoretical evaluation shows that the proposed DWA method is suited to λ-tuning for load balancing among the optical subscriber units.