4100 Series CWDM

A CWDM OTDR test solution to deploy or maintain and troubleshoot in-service CWDM fiber networks

4100 Series CWDM

VIAVI CWDM OTDR solution enables cable operators, dark fiber providers and telecommunication service providers to test through MUX/DEMUX and perform a complete end-to-end link characterization or troubleshooting of active C-RAN, DAS and mobile fronthaul CWDM networks. Learn more about OTDR Testing.


  • 18 CWDM wavelengths covered in only 2 OTDR modules
  • Perfect for end-to-end link characterization
  • Ideal to test new CWDM wavelength routes or pinpoint faults and know their exact locations without disrupting traffic on active channels
  • Can be combined with a CWDM spectrum analyzer module (COSA-4055) to measure the wavelengths and power levels of active CWDM channels


  • Characterize end-to-end links with exact CWDM wavelengths
  • Troubleshoot active networks with in-service testing capability
  • Verify end-to-end continuity with the continuous wave source function

Key Features

  • CWDM8U version includes 8 wavelengths from 1471 nm to 1611 nm
  • CWDM10U version includes 10 wavelengths from 1431 nm to 1611 nm
  • CWDM10L version includes 10 wavelengths from 1271 nm to 1451 nm
  • Integrated CW light source with modulation capability (same OTDR wavelengths)
  • Eliminate OTDR interpretation errors with Smart Link Mapper (SLM) option (converts the OTDR trace into icons – splice, connector, MUX/DEMUX)
  • Compatible with T-BERD/MTS-2000, -4000, -4000 V2 and -5800 platforms

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