How to cut the filler rope during fiber optic splicing

Article Overview

Use a fiber optic stripper or kevlar scissors to carefully cut the filler rope (aramid yarn) without nicking the fiber, ensuring a clean and safe splice.

Tools Needed

  • Fiber optic stripper or specialized aramid/kevlar scissors
  • Cable stripper for outer jacket
  • Lint-free wipes and isopropyl alcohol for cleaning
  • Fiber cleaver for precise fiber end preparation

Step-by-Step Procedure

  1. Expose the Fiber: Begin by stripping the outer jacket and buffer tubes of the fiber optic cable using a cable stripper until the bare fiber is visible. Remove any strength members carefully, as these often include the filler rope (aramid yarn) that provides tensile strength .
  2. Secure the Cable: Hold the cable firmly on a stable surface or in a cable holder to prevent movement. This reduces the risk of accidentally cutting the fiber itself .
  3. Cut the Filler Rope: Using a fiber optic stripper or kevlar scissors, trim the filler rope close to the jacket or buffer tube. Ensure the cutting tool is sharp and perpendicular to the rope to avoid fraying. Avoid pulling or yanking the filler rope, as this can stress the fiber cores .
  4. Clean the Area: After cutting, remove any loose fibers or debris. Wipe the exposed fiber and surrounding area with a lint-free cloth soaked in isopropyl alcohol to prevent contamination during splicing .
  5. Proceed to Fiber Cleaving: Once the filler rope is removed, cleave the fiber using a high-precision fiber cleaver. The cleave should be flat and perpendicular to the fiber axis to ensure a low-loss splice .
  6. Splice the Fiber: Insert the prepared fiber ends into a fusion splicer or mechanical splice unit. The splicer will align and fuse the fibers, or the mechanical splice will hold them in place with index matching gel .

Safety Tips

  • Always wear safety glasses to protect against fiber shards .
  • Do not cut both fibers at once; handle one side at a time to prevent breakage .
  • Keep the work area clean and free of dust to avoid contamination of the splice . By carefully cutting the filler rope and preparing the fiber, you ensure a clean, low-loss splice and protect the integrity of the fiber optic cable.

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