Techniques for stripping thick optical cables

Stripping thick optical cables requires specialized fiber optic strippers, careful layer-by-layer removal, and precise handling to avoid damaging the glass fibers.

Understanding Cable Structure

Thick optical cables typically consist of multiple layers: the outer jacket, strength members (like aramid yarn), buffer coatings, cladding, and the core. Each layer serves a protective or structural function, and improper stripping can damage the fiber, causing signal loss or connection failure .

Tools for Stripping Thick Cables

1. Handheld Fiber Strippers: Precision tools with multiple notches for different layers. For thick cables, strippers often include:
   • A large notch for the outer jacket (1.6–3 mm)
   • A middle notch for tight buffers (900 µm)
   • A small notch for acrylate coatings down to the 125 µm glass cladding
2. Rotary or Blade Strippers: Useful for larger jackets; they allow controlled cutting around the cable circumference .
3. Mechanical, Thermal, or Chemical Strippers: Advanced methods include thermal stripping (heating the coating), chemical solvents, or plasma techniques for specialized coatings .

Step-by-Step Stripping Technique

1. Preparation: Inspect the cable, identify layers, and mark stripping points. Ensure the correct stripper is selected for the cable diameter and jacket thickness .
2. Outer Jacket Removal: Use the large notch or adjustable blade to make a radial cut around the jacket. Pull off the jacket carefully to expose the strength members.
3. Cutting Strength Members: Trim aramid yarn or other fibers with cable-cutting scissors to prevent interference with the fiber.
4. Buffer and Coating Stripping: Use the appropriate notch to remove the buffer coating and acrylate layer, exposing the bare glass fiber. Avoid stripping more than 50 mm at a time to prevent fiber damage .
5. Cleaning: Wipe the exposed fiber with a lint-free cloth and high-purity alcohol to remove residues.
6. Inspection: Use a microscope or magnifying glass to check for nicks or scratches before cleaving or splicing .

Safety and Best Practices

• Always wear safety glasses to protect against flying debris.
• Adjust stripper settings carefully to match cable diameter and coating thickness.
• Avoid using generic wire strippers or knives, as they can create micro-fractures in the fiber .
• Work slowly and methodically, especially with thick or multi-layered cables. By following these techniques and using professional-grade tools, technicians can safely strip thick optical cables while maintaining fiber integrity and ensuring reliable network performance .