Removing fiber optic cable filler

Fiber optic cable filler can be safely removed using precision stripping tools while following proper safety precautions to avoid damaging the fibers.

Understanding Fiber Optic Cable Fillers

Fiber optic cables often contain filler rods or yarns to maintain the cable's shape and protect the fibers from stress. These fillers are typically made of plastic or dielectric materials and are located between buffer tubes or around the central strength member. Removing them is necessary when preparing the cable for splicing or connectorization, but care must be taken to avoid nicking or breaking the delicate glass fibers inside (Corning Cable Systems) .

Tools for Removing Fillers

Specialized fiber optic stripping tools are recommended for removing fillers and cable jackets. Options include:

• Mechanical fiber strippers: Handheld tools with precise blades for cutting and removing fillers and coatings without damaging fibers .
• Round cable strip & ring tools: Designed for larger cables, allowing longitudinal, spiral, or circular cuts to remove fillers and jackets efficiently .
• Adjustable cable strippers: Tools like the Kabifix LK25 allow controlled circular or longitudinal cuts for plastic tubes and fillers, with interchangeable blades for precision .

Step-by-Step Procedure

1. Safety first: Wear safety gloves and glasses to protect against sharp blades and fiber shards .
2. Prepare the cable: Measure the length of cable to be stripped and secure it on a stable surface.
3. Remove the outer sheath: Use a cable stripper to make a longitudinal or circular cut along the sheath, exposing the inner buffer tubes and fillers .
4. Identify the filler rods: Carefully separate the filler rods from the buffer tubes. Some fillers may be water-blocking yarns or tapes that need gentle peeling.
5. Strip the fillers: Use a precision fiber stripper or small scissors to remove the filler rods without applying excessive force that could bend or break the fibers .
6. Clean the fibers: After removing fillers, wipe the fibers with a lint-free cloth or alcohol wipe to remove any debris before splicing or connectorization.

Additional Tips

• Avoid excessive pulling or bending; adhere to the cable's minimum bend radius .
• Dispose of removed fillers and used blades safely.
• For cables with tight buffer tubes, consider using a thermo-mechanical stripper to soften coatings before removal . By following these steps and using the appropriate tools, fiber optic cable fillers can be removed safely and efficiently, ensuring the fibers remain intact for high-quality splicing or termination.