Abstract 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 long-reach 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.

中文翻译：

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基于 QoT 感知自适应调制格式的集群 LR-PON 资源配置

摘要 传统无源光网络（PON）的覆盖范围为20公里，难以满足越来越多的用户和覆盖区域的需求。因此，本文提出了一种将接入网络扩展到数百公里的软件定义长距离 PON (LR-PON) 架构。使用所提出的 LR-PON 架构，它结合了基于正交频分复用的时波分复用 PON（基于 OFDM 的 TWDM-PON），在网络资源有限的情况下，高带宽利用率和小带宽分配粒度可以解决这个问题流量快速增长。此外，为了解决主要挑战，例如由于较长的往返时间和所有类型服务的数据可靠传输而导致更高的上行信道空闲时间，在考虑能耗的同时，我们还提出了一种传输质量（QoT）感知自适应调制格式的资源供应算法，该算法考虑了 PHY 和 MAC 层。为验证所提出的架构和算法的性能而进行的仿真结果表明，它们可以减少平均延迟，显着提高吞吐量和网络 QoS，确保最佳资源配置，并满足各种服务需求。