Routed Optical Networking is an architecture that delivers improved network efficiencies and operational simplicity. It does this by converging IP and optical layers of the network and delivering coherent wavelengths directly from router ports using standardized 400G ZR/ZR+ pluggable optics. With a routed optical network, wavelength services can be delivered using Private Line Emulation (PLE) while maintaining service-level agreements and characteristics such as guaranteed bandwidth and persistent bidirectional paths.

https://www.cisco.com/site/us/en/solutions/routed-optical-networking/index.html