Steps for inspecting and checking the optical splitter

Optical splitters can be tested using a light source and optical power meter to measure insertion loss, splitting ratio, and port performance according to industry standards.

Tools and Preparation

To test an optical splitter, you will need:

• Optical light source (dual wavelength 1310/1550 nm for standard testing)
• Optical power meter (high resolution, e.g., 0.001 dB)
• Launch and receive reference cables with standard connectors
• Cleaning tools (alcohol wipes, fiber cleaning pen) to ensure connector integrity
• Optional OTDR for reflection and event detection
• Maintain temperature around 23°C ± 5°C and humidity below 85% to avoid deviations .

Step-by-Step Testing Procedure

1. Calibrate the System: Connect a launch reference cable to the light source and calibrate the optical power meter to set a 0 dB reference .
2. Measure Loss for Each Output Port:
   • Connect the splitter input to the light source.
   • Attach the receive cable to one output port and measure the optical power.
   • Move the receive cable to each additional output port sequentially and record the loss.
   • Compare measured loss to the expected split ratio loss and excess loss; typical PLC splitters should have ≤0.8 dB variation between outputs .
3. Check Splitting Ratio: Ensure the measured output power matches the expected split ratio within ±5% tolerance for standard splitters .
4. Reverse Direction Testing: For bidirectional verification, reverse the light source and meter to test upstream performance .
5. OTDR Testing (Optional): Use an OTDR to detect reflections, microbends, or connector issues. Acceptable reflectance values are ≥55 dB for PC endfaces and ≥60 dB for APC endfaces .
6. Environmental and Cyclic Testing: For high-reliability applications, test the splitter under temperature cycles (-40°C to +75°C) to ensure loss changes remain ≤0.5 dB .

Inspection and Troubleshooting

• Connector Inspection: Always inspect fiber endfaces before testing to prevent damage and inaccurate readings .
• Common Issues: Mechanical damage, microbends, improper splicing, or high-temperature deformation can cause excessive loss or failure .
• Standards Compliance: Follow ITU-T G.671, Telcordia GR-1209, and GR-1221 for functional and performance criteria .

Summary

Testing an optical splitter involves measuring insertion loss, verifying splitting ratios, checking for reflections, and inspecting connectors. Using a calibrated light source and optical power meter, along with proper environmental control and adherence to standards, ensures the splitter is functioning correctly and ready for deployment in PON or FTTx networks .