What should you do if your fiber optic cable is scratched

Scratches on fiber optic cables should be carefully inspected, cleaned if minor, and repaired or replaced if they compromise signal quality.Inspection and AssessmentUse a fiber inspection microscope to examine the end face of the connector for scratches, cracks, or pits. The size and location of scratches determine whether they affect performance. Scratches on the core or contact zones are more critical than those on the cladding or adhesive layer. The IEC 61300-3-35 standard provides criteria for pass/fail certification based on the number and size of scratches in each measurement region of the fiber end-face .Cleaning Minor ScratchesFor minor surface scratches that do not penetrate deeply, cleaning can help remove debris and contaminants:Use lint-free wipes and fiber-specific solvents such as isopropyl alcohol .Avoid excessive cleaning, as repeated attempts can worsen scratches or leave residues .Ensure all cleaning tools and surfaces are free from abrasive particles to prevent cross-contamination .Repair or ReplacementIf scratches are deep or located on critical areas, cleaning alone is insufficient:Repolishing the connector end-face may restore performance if the scratch is repairable .Replacing the connector or cable is recommended for severe scratches, cracks, or pits that cannot be polished out .After repair or replacement, re-inspect the fiber to confirm compliance with IEC standards.Preventive MeasuresMaintain a stable polishing process with proper lapping films, pressure, and rotation speed to minimize scratches during assembly .Clean all polishing films, connectors, and fixtures thoroughly between steps to avoid cross-contamination .Handle fiber cables carefully, avoiding sharp bends, kinks, or contact with hard surfaces that can cause scratches .Schedule routine inspections to detect early defects and maintain optimal signal clarity . By following these steps—inspection, careful cleaning, repair or replacement, and preventive handling—you can effectively manage scratches on fiber optic cables and maintain network performance.