I'm not sure but kinda doubt it's built into the main NPM mib file but you could use UnDP to monitor anything as Infinera supports snmp.
Someone uploaded the mib on this thread as well:
right, the challenge, with DWDM nodes is that the MIB indexes variables on the optical path may not have equivalents in the ifMIB. This makes it a challenge to tie optical power readings and optical signal presence to an interface: With the cisco ONS MIB it would have been so much easier if they had created ifMIB entries for each optical interface, and then used those to index into the optical path information (e.g. the wavelength of light, received power, transmitted power, etc). but they didn't and so monitoring them is a right pain (UnDP don't really help here)
Back to Infinera: if I had SNMP access to an actual infinera then I could look at the MIB data and assess the competency of their MIB designer. (if anyone can provide me with a SNMPwalk that would be awesome).