CWDM OTDR Modules 

CWDM OTDR Modules – 4100-Series for T-BERD/MTS-2000, -4000 V2 and 5800 Platform

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

CWDM OTDR Modules 

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.


  • The most compact CWDM OTDR solution in the market: 18 CWDM wavelengths covered in only 2 OTDR modules.
  • Perfect for end-to-end link characterization during network deployment / construction.
  • 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 1471nm to 1611nm.
  • CWDM10U version includes 10 wavelengths from 1431nm to 1611nm.
  • CWDM10L version includes 10 wavelengths from 1271nm to 1451nm.
  • 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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