How to test after fiber optic splitter

Fiber optic splitters are tested by measuring insertion loss using an optical power meter and light source, following double-ended or single-ended test procedures.

Equipment Needed

• Optical power meter to measure received optical power.
• Optical light source at the appropriate wavelength (splitters may be wavelength-dependent).
• Launch reference cables to connect the source and meter to the splitter.
• Inspection tools (e.g., USB microscope) to check fiber end faces before testing to prevent damage.

Testing Procedure

1. Set Up the Source and Reference
   • Connect a launch reference cable to the optical light source.
   • Calibrate the optical power meter with the launch cable to set a 0 dB reference, ensuring accurate loss measurement .
2. Connect to the Splitter
   • Attach the source launch cable to the splitter input.
   • Connect a receive launch cable from one output port to the optical power meter.
3. Measure Loss
   • Record the optical power reading. This measures the insertion loss, which includes the split ratio, excess loss from manufacturing, and connector losses .
   • For multiple output ports (e.g., 1x32), move the receive cable to each port in turn and record the loss for each.
4. Test in Reverse (Upstream)
   • Reverse the direction of the test to measure loss from output ports back to the input, which is important for bidirectional splitters .
5. Testing Multi-Input Splitters
   • For splitters with multiple inputs (e.g., 2x2 or 2x4), test each input to all outputs individually, recording the loss for each path .
6. Inspection and Standards Compliance
   • Inspect all fiber connectors before testing to avoid damage.
   • Follow standards such as OFSTP-14 for double-ended loss or FOTP-171 for single-ended testing.
   • Use equipment like the CertiFiber Pro OLTS for automated testing and grading of splitter loss according to ANSI/TIA and ISO/IEC standards .

Tips

• Always use clean and properly rated connectors.
• Record all measurements for each port to ensure the splitter meets manufacturer specifications.
• For PON splitters, testing each output individually is critical to verify network performance. By following these steps, you can accurately measure the performance of fiber optic splitters and ensure they meet network requirements.