In the metro-access optical network, bandwidth-allocated mechanism and its algorithm are proposed for the multi-subsystem-based virtual passive optical network (VPON) that can implement the syncretism of multiple systems such as time division multiplexing-PON, wavelength division multiplexing-PON and orthogonal frequency division multiplexing-PON. To avoid frequent bandwidth reallocation, the matrix of bandwidth-demanded variation is introduced. According to the norm of this matrix, admission condition of bandwidth allocation for VPON users is established. To distinguish different bandwidth-demanded variation of multiple subsystems and allocate bandwidth fairly and efficiently for VPON, the bandwidth-allocated scheme is employed. To the increase of VPON's bandwidth demand, the multi-granularity-based bandwidth-allocated algorithm is proposed to promote the admission probability of new VPONs. MATLAB is used to evaluate the performance of the proposed mechanism and algorithm. Considering the representativeness of various situations, the admission condition of bandwidth allocation for VPON users is demonstrated with ten VPONs. The bandwidth-allocated scheme and algorithm are verified effectively in bandwidth-utilised ratio with two original VPONs of high priority and two new VPONs of low priority, as well as in admission probability with four new VPONs.
['Weidong Xia', 'Chaoqin Gan', 'Weilun Xie', 'Shucong Ma']
Bandwidth-allocated mechanism and its algorithm for multi-subsystem-based virtual passive optical network in metro-access optical network