Joint bandwidth allocation on dedicated and shared wavelengths for QoS support in multi-wavelength optical access network

Wavelength-division multiplexing (WDM) technology has been recognised as one of the most promising solutions in optical access network. A general ring-based multi-wavelength optical access network based on WDM technology, which can realise triple-play service including point-to-point service and multicast service is introduced in this study. To effectively utilise the network bandwidth resources, the authors propose a joint bandwidth allocation scheme on dedicated and shared wavelengths. The proposed scheme focuses on quality of services (QoSs) support. It is carried out according to the priority queue discipline to support QoS in terms of average packet delay, packet delay variance and throughput. Moreover, with the fair-awareness in the scheduling scheme, the lower priority services can be prevented from starvation and the over-allocation problem can be avoided. The simulation results show that the proposed scheme can reduce average packet delay and packet delay variance for high-priority services to ensure QoS.