Advances in SDN control and telemetry for beyond 100G disaggregated optical networks

This tutorial considers the evolution of software-defined networking (SDN) control for optical transport networks (OTNs) in disaggregated scenarios, focusing on its requirements and challenges when applied to "beyond 100G" networks, a term that jointly refers to the use of coherent technology, data rates beyond 100G, and the evolution of OTN standards to support rates such as 200G, 400G, or 800G. The tutorial covers use-case-driven SDN development, new challenges, and requirements, such as the need to account for physical impairments, multiband/space-division multiplexing control, improved fault/alarm management, and optical telemetry and streaming. Finally, the tutorial provides an overview of new trends such as network sharing. (C) 2022 Optica Publishing Group.This project has received funding from the European Union's Horizon 2020 research and innovation programme, B5G-OPEN Project, grant agreement No. 101016663 and Spanish Grant AURORAS RTI2018099178-B-I00 funded by MCIN/AEI/10.13039/501100011033 and by ERDF A way of making Europe