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

TL;DR

This paper introduces a spectrum configuration framework for open optical systems that maximizes throughput by jointly optimizing transceiver parameters, validated through experiments and a knapsack-based optimization in a metro-scale testbed.

Contribution

It presents a novel joint optimization approach for transceiver parameters, including roll-off factor, to enhance throughput and QoT in open optical networks.

Findings

Roll-off factor optimization improves QoT in cascaded WSS filtering.

Knapsack-based method effectively maximizes throughput within spectrum constraints.

Experimental validation confirms the framework's efficiency and adaptability.

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.