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740C xWDM OTDR Series -

C-band DWDM and 18-wavelength CWDM tunable OTDR series for metro Ethernet, remote PHY and passive C-RAN link characterization.

Key features

CWDM+DWDM combo available in compact FTB-1 V2
C-BAND ITU DWDM grid channels 12-62 selection in a single OTDR port
18 CWDM channels covered in one OTDR port scalable to your deployments
Unprecedented intelligent fiber characterization with iOLM
Test through MUX/DEMUX/OADM
In-service testing of active networks
High-resolution and short dead zones
Select favorite channels list
iOLM’s SFP-Safe Troubleshooting: guarantees no damage to SFP


Single-ended construction and troubleshooting solution
CWDM and DWDM metro Ethernet links
Commercial services deployments
Fiber deep, Remote PHY and node splitting
CBH antenna feeds


This series includes one CWDM tunable OTDR module to cover all 18 CWDM channels from a single port and one DWDM tunable OTDR module to cover DWDM C-Band channels. This solution is available in the FTB-1V2, FTB-2 and FTB-4 platforms.

The 740C xWDM OTDR series has been designed with EXFO’s renowned high-quality standards to stabilize central wavelength under test, preventing any drift/leakage into adjacent channels, which would otherwise affect other valuable customers.

This OTDR is a scalable solution that can grow with your network by adding channels further down the road, hence allowing CAPEX reduction while covering your current and future needs.

The OTDR’s user-friendly interface lets the technician define a list of favorite channels over the C-Band (DWDM) or CWDM grid (CWDM) for quicker access and a more efficient test routine.

CWDM and DWDM: the answer to future bandwidth growth

CWDM and DWDM are gaining popularity for passive C-RAN or commercial services deployments such as fiber deep, Remote PHY and metro Ethernet in which each wavelength can address a specific site, such as a cell tower. Both CWDM and DWDM approaches are not mutually exclusive and co-exist in hybrid passive networks that feature DWDM over CWDM to maximize fiber capacity.

Use a xWDM tunable OTDR for:

  • Single-ended CWDM/DWDM fiber characterization
  • Validating the continuity and end-to-end loss through MUX, OADM and DEMUX, during construction
  • In-service testing using the client’s wavelengths port—without any downtime or impacting other client wavelengths
  • Troubleshooting and characterization by a single operator from the head-end 


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