CWDM OTDR Modules (4100 Series)

4100 Series Module for T-BERD/MTS-2000, -4000 V2 and 5800 and OneAdvisor 800, FTH-9000 Platforms

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

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


  • 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

  • Repair and Calibration

    Our products live in rugged environments for over 10 years with 1000s of test connect/disconnect cycles.  We will be there to support you to ensure components that require maintenance like connectors, batteries, and software updates to ensure you are ready to test accurately for years to come. We apply factory procedures that use fast, automated calibration and functional verification, maintenance using OEM parts and the application of all engineering change orders and software updates. Services are available through contract Care plans, FleetCare or per incident as requests. 

    Top 4 Reasons to Choose VIAVI for Your Repair and Calibration Needs:

    • Minimize business disruption
    • Budget
    • Measurement Accuracy and Product Reliability
    • Measurement Compliance, TL9000 certification and OEM Standards

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