OTDR from EXFO covers channel spacing of 100/50 GHz

The FTBx-740C-DWC high-resolution tunable optical time domain reflectometer (OTDR) can field-test mux/demux channels using the customer’s wavelength to troubleshoot faulty links or deliver first-time-right deployments during construction. It operates in the C-band, covers channel spacing of 100/50 GHz based on the ITU-T standard grid, and runs on Windows 8.
EXFO
Quebec City, QC, Canada
http://exfo.com/tunable-otdr