Stripping and fixing of optical cables

Proper stripping and fixing of optical cables requires precision tools, careful layer-by-layer removal, and thorough inspection to prevent fiber damage and ensure optimal signal transmission.

Understanding Cable Structure

Optical cables typically consist of multiple layers: the outer jacket, strength members (like aramid yarn), buffer coating, cladding, and the core. Each layer serves a protective or structural function, and improper handling can compromise the fiber's integrity, leading to signal loss or connection failure . Single-mode and multi-mode fibers may have different coating thicknesses, which affects stripping techniques .

Stripping Techniques

1. Prepare the Work Area: Ensure a clean, well-lit workspace free from dust and debris. Lay out all tools within easy reach .
2. Layer-by-Layer Stripping:
   • Outer Jacket: Use a wire or fiber optic jacket stripper to remove the outer sheath without nicking the underlying layers .
   • Strength Members: Carefully cut or pull away aramid yarns, ensuring the fiber remains undamaged .
   • Buffer Coating: Use a precision fiber optic stripper to remove the buffer and acrylate coatings down to the glass cladding (typically 125 µm) without scratching or nicking the fiber .
3. Tool Selection: Use professional-grade optical fiber strippers, which may be mechanical, thermal, or non-contact, depending on the fiber type and coating . Avoid generic wire strippers, as they can create micro-cracks that weaken the fiber .
4. Cleaning: After stripping, clean the exposed fiber with alcohol wipes or a suitable cleaning solution to remove debris and residue .

Fixing and Preparing Fiber Ends

1. Cleaving: Use a fiber optic cleaver to create a clean, perpendicular end face. Proper cleaving ensures minimal signal loss and optimal connector or splice performance .
2. Inspection: Examine the cleaved fiber with a microscope or visual fault locator (VFL) to confirm the end face is smooth and defect-free .
3. Termination or Splicing: Once stripped and cleaved, the fiber can be terminated with connectors or fusion-spliced. Repeat the stripping and cleaning process for each fiber individually to maintain consistency .

Best Practices

• Maintain sharp, well-calibrated tools to prevent accidental fiber damage .
• Strip fibers progressively, not all at once, to avoid nicking inner layers .
• Handle fibers gently to prevent micro-cracks, which can propagate under stress or thermal cycling .
• Always verify fiber integrity before final termination to ensure network reliability . By following these techniques, technicians can achieve clean, precise fiber terminations, reduce signal attenuation, and ensure long-term network performance.