It is. Any links higher than that are pretty much all Nx100G, though there are a few carriers with (limited) 200G waves in production. For anything over 100G (

It is. Any links higher than that are pretty much all Nx100G, though there are a few carriers with (limited) 200G waves in production. For anything over 100G (currently) you're making some sacrifices on distance and may even need some guard bands. (Short-haul/intra-DC may well be a different story but I doubt that it's very different.)