Spectrum Configuration Framework for Throughput Maximization in Open Systems with Roll-Off-Based QoT Optimization

2026-04-20

AI Summary

This work addresses the joint optimization of modulation format, symbol rate, pulse-shaping roll-off factor, and WSS bandwidth in open and disaggregated optical systems under fixed spectrum allocation and limited transceiver resources, aiming to maximize throughput while ensuring a quality-of-transmission (QoT) margin. For the first time, experimental results reveal the critical impact of the roll-off factor on QoT under cascaded WSS filtering, which is then incorporated into a knapsack-based optimization model tailored for Optical Spectrum-as-a-Service (OSaaS) to enable adaptive trade-offs between throughput and QoT margin. Validation on a metro-scale testbed demonstrates that the proposed approach significantly enhances spectral efficiency, achieving an effective balance between throughput and transmission quality.

Technology Category

• Search and Optimization: Non-convex Optimization
• Planning, Routing, and Scheduling: Optimization of Spatio-temporal Systems
• Constraint Satisfaction and Optimization: Distributed CSP/Optimization

Application Category

• Systems and Infrastructure for Web, Mobile and WoT: Web performance, measurement, and characterization
• Security and Privacy: Data transparency and provenance
• Economics, Online Markets and Human Computation: Incentives in network design for Web infrastructures and ecosystems

Abstract

We propose a spectrum-configuration framework for open and disaggregated optical systems that maximizes throughput while guaranteeing the quality of transmission (QoT) margins. The framework jointly optimizes transceiver parameters, including modulation format, symbol rate, pulse-shaping roll-off factor, and wavelength-selective switch (WSS) bandwidth, under fixed spectral allocation constraints. The impact of roll-off factor optimization is first experimentally evaluated in the presence of cascaded WSS filtering, demonstrating measurable QoT gains for both single- and multi-channel transmission. Building on these observations, a knapsack-based optimization is applied in the context of Optical Spectrum as a Service (OSaaS) to select service configurations that maximize aggregate throughput within a fixed spectrum width and limited transceiver resources. Experimental validation on a metro-scale open testbed confirms the effectiveness of the proposed approach in achieving efficient spectrum utilization and adaptive throughput-margin trade-offs.

Problem

• spectrum configuration
• throughput maximization
• quality of transmission
• open optical systems
• roll-off factor

Innovation

• roll-off optimization
• spectrum configuration
• quality of transmission (QoT)
• Optical Spectrum as a Service (OSaaS)
• knapsack-based optimization