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How to test fiber optic cable connector loss

ODN and passive infrastructure knowledge brief Published 30 Jan 2023

Prepared for preliminary research by the GESTIONVAL ODN knowledge desk. Confirm network topology, split ratio, box or cabinet capacity, joint closure rating and loss budget against current standards and product documentation.

Fiber optic connector loss is measured using a light source and power meter setup, comparing transmitted power through the connector to a reference to determine insertion loss.Required Tools and Equipment
  • Test Source: LED or laser source appropriate for the fiber type and wavelength (e.g., 850/1300 nm for multimode, 1310/1550 nm for singlemode) .
  • Optical Power Meter: Calibrated for the same wavelength as the source .
  • Reference Test Cables: Known good cables of the same fiber type and connector type .
  • Mating Adapters: Compatible with the connectors being tested .
  • Cleaning Supplies: Lint-free wipes and alcohol to clean connectors and adapters .
Step-by-Step Procedure
  1. Prepare Equipment: Turn on the source and power meter, allowing them to warm up. Ensure all reference cables are tested for integrity using a single-ended loss test .
  2. Clean Connectors: Thoroughly clean all connectors and mating adapters to prevent contamination from affecting measurements .
  3. Set Reference Power: Connect the launch reference cable to the source and the receive reference cable to the power meter. Measure the power and set this as the 0 dB reference .
  4. Connect Cable Under Test: Attach the cable under test between the launch and receive reference cables using mating adapters. Measure the power at the meter .
  5. Calculate Connector Loss: The difference between the reference power and the measured power is the insertion loss of the connector(s) .
  6. Test Both Ends: For short patch cords, reverse the cable and repeat the measurement to determine the loss of the connector on the other end .
Additional Tips
  • Use Hybrid Adapters if the test equipment connectors differ from the cable plant connectors .
  • Document Results: Record the measured loss for each connector to ensure compliance with network specifications .
  • OTDR Testing: For long cables with splices, an OTDR can verify individual splice and connector losses, though discrete connector testing is generally not required for overall link performance . By following this procedure, you can accurately measure the insertion loss of fiber optic connectors, ensuring the cable plant meets performance standards and minimizing signal degradation in the network.

How to test fiber optic cable connector loss - GESTIONVAL ODN INFRASTRUCTURE S.L. [PDF]

How to test fiber optic cable connector loss

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Technical note

This reference is intended for preliminary ODN and passive infrastructure research. Topology, split ratio, box or cabinet capacity, closure rating, cable type, test limits and applicable standards must be verified for the specific project.

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