QoT-aware adaptive modulation format-based resource provisioning for clustered LR-PON

摘要

The range of conventional passive optical networks (PONs) is 20 km, which are difficult to satisfy the requirements of accommodating increasing number of users and coverage areas. Thus, a software-defined longreach PON (LR-PON) architecture which extends the access network to hundreds of kilometres is proposed in this paper. Using the proposed LR-PON architecture, which incorporates orthogonal frequency division multiplexing-based time-wavelength division multiplex PON (OFDM-based-TWDM-PON), high bandwidth utilisation and small bandwidth allocation granularity with limited network resources is possible to deal with this rapid traffic growth. Further, to address major challenges such as higher upstream channel idle time owing to long round trip time and data-reliable transmission for all types of services, while considering energy consumption, we also propose a quality-of-transmission (QoT)-aware adaptive modulation format-based resource provisioning algorithm that considers the PHY and MAC layers. The results of simulations conducted to verify the performance of the proposed architecture and algorithm demonstrate that they can reduce average latency, significantly improve throughput and network QoS, ensure optimal resource provisioning, and satisfy various service requirements.