Bandwidth solves all network problems and DWDM coherent optical networks are a significant step in efficiency and cost. Coherent SFP optic modules installed into routers replace the DWDM transponders at the edge of the optical network.

Source white paper (not paywalled) : Reimage IP over DWDM with Juniper CORA
For those that run large-scale networks, IPoDWDM offers a once-in-a-generation opportunity to reimagine the economics of DWDM operations and Juniper has products today.
In this podcast we discuss how Juniper is building a complete ecoystem around coherent optics with diverse supply sources, automation and strong open standards support and validation. Enterprises can simply implement point-to-point DCI with much less cost, space and better automation. Cloud providers can also scale up their multi-building and multi-site interconnects. Short and long haul networks get the same benefits for their needs too.
JCO400 ZR+ optics can support metro 400G DWDM links over 500km, regional 300G DWDM links over 900km and long-haul 200G DWDM links over 2,000km. New OpenZR+ 0-dBm optics with high transmit power, customers can even deploy coherent pluggables in networks with significant fiber budget losses, including over ROADM infrastructures spanning hundreds of kilometers.
Link: Making the Dream of Packet-Optical Convergence a Reality: Juniper Networks’ Converged Optical Routing Architecture (CORA) | Official Juniper Networks Blogs – https://blogs.juniper.net/en-us/service-provider-transformation/making-the-dream-of-packet-optical-convergence-a-reality-juniper-networks-converged-optical-routing-architecture-cora
Find Out More
Converged Optical Routing Architecture (CORA) Solution Over from Juniper – https://www.juniper.net/us/en/solutions/converged-optical-routing-architecture-cora.html
Making the Dream of Packet-Optical Convergence a Reality: Juniper Networks’ Converged Optical Routing Architecture (CORA) | Official Juniper Networks Blogs – https://blogs.juniper.net/en-us/service-provider-transformation/making-the-dream-of-packet-optical-convergence-a-reality-juniper-networks-converged-optical-routing-architecture-cora
Research Links
Heavy Reading Reports 2022, “Coherent Optics at 400G, 800G and Beyond A 2022 Heavy Reading Survey”
Heavy Reading Reports 2021, “Coherent Optics at 400G, 800G and Beyond A 2021 Heavy Reading Survey”
Cignal AI, “400ZR/ZR+ IPoDWDM Market Impact and Forecast”, November 2021
ACG Research: “The Economic Benefits of Automating Capacity Optimization in IP Networks”