For example: Agilent E4440A or Anritsu 68369
Keysight / Agilent Optical Meters
Keysight / Agilent 8509B
1200 to 1600 nm, Used Lightwave Polarization Analyzer
Manufacturer: Keysight / Agilent
Keysight / Agilent 86122A-022-400
Multi-Wavelength Meter, 1270 to 1650nm
Manufacturer: Keysight / Agilent
Keysight / Agilent 8702E
Lightwave Component Analyzer (30Khz to 3GHz or 6GHz optional)
Manufacturer: Keysight / Agilent