That depends.
Is this dark fiber that you're running a P2P ethernet circuit on?
If you have a fiber transit provider available, you can ask for DWDM transport (Cisco ONS15454) in which case you can hand of to their Transponder or Muxsponder as MMF, or you can skip the transponder and they'll stipulate a DWDM SM SPF at the exact lambda.
~BAS
