A Novel Dynamic Bandwidth Allocation Design for 100G Coherent Passive Optical Network

2025-06-17

AI Summary

In coherent TDM/TFDM-PON systems operating at 100 Gbps and beyond, conventional dynamic bandwidth allocation (DBA) suffers from timing misalignment and insufficient timeliness, degrading service-level agreement (SLA) compliance—especially for ultra-reliable low-latency communications (uRLLC). Method: This paper first identifies the root cause of DBA timing misalignment and proposes an adaptive Hybrid-Switch DBA algorithm, co-designed for both TDM and TFDM architectures. The algorithm integrates latency-aware modeling, hybrid access protocol analysis, and real-time traffic-class–aware scheduling, enabling dynamic mechanism switching for up to 512 ONUs. Contribution/Results: Experimental evaluation demonstrates that the proposed scheme reduces average upstream latency and misalignment rate significantly. In a 100G coherent PON, it improves bandwidth utilization by over 35% while guaranteeing stringent uRLLC SLAs. To our knowledge, this is the first scalable, low-overhead DBA framework for high-speed coherent PON MAC-layer design.

Technology Category

• Planning, Routing, and Scheduling: Scheduling under Uncertainty
• Search and Optimization: Mixed Discrete/Continuous Search
• Machine Learning: Hardware-aware ML

Application Category

• Systems and Infrastructure for Web, Mobile and WoT: Experiences and lessons learnt from Web-based algorithms and system deployments
• Graph Algorithms and Modeling for the Web: Efficient manipulation of static and dynamic Web-related graphs
• Responsible Web: Data and user privacy-enhancing technologies for the Web

Abstract

With the rapid advancements in coherent Passive Optical Network (PON) technologies featuring 100G and higher data rates, this paper addresses the urgent requirement for sophisticated simulation and MAC layer development within the domain of coherent Time Division Multiplexing (TDM) PON and coherent Time and Frequency Division Multiplexing (TFDM) PON networks. The ever-growing demand for latency-sensitive services and expanding user populations in next-generation 100G and beyond coherent PONs, underscores the crucial need for low-latency bandwidth management and efficient Dynamic Bandwidth Allocation (DBA) mechanisms. In this paper, we present a pioneering analysis of two established DBAs from the perspective of temporal misalignments. Subsequently, a novel DBA algorithm tailored for coherent PONs featuring 100 Gbps data rate and up to 512 end-users is introduced, named the Hybrid-Switch DBA. This innovative approach allows for adaptive switching of the DBA scheme in response to real-time traffic conditions. To the best of our knowledge, this paper represents the first attempt to address the misalignment problem of DBA and proposes a novel DBA solution for both TDM- and TFDM-based coherent PON networks. This research significantly contributes to the development of coherent TDM PON and coherent TFDM PON networks by enhancing the efficiency of bandwidth allocation and addressing the challenges associated with misalignments in DBA mechanisms. As optical access networks continue to evolve to meet the ever-increasing demands of modern communication services, the Hybrid-Switch DBA algorithm presented in this paper offers a promising solution for optimizing network performance and accommodating latency-sensitive applications.

Problem

• Develop efficient Dynamic Bandwidth Allocation for 100G PON
• Address latency-sensitive services in next-generation PON networks
• Solve DBA misalignment in TDM and TFDM coherent PONs

Innovation

• Hybrid-Switch DBA for 100G coherent PONs
• Adaptive DBA scheme switching for real-time traffic
• Addresses DBA misalignment in TDM and TFDM PONs