Splicing aluminum-clad steel optical cables requires careful preparation of both the metallic armor and the optical fiber, typically using fusion splicing for the fiber and mechanical or heat-shrink techniques for the armored layer.

Fiber Optic Splicing

The core optical fiber inside aluminum-clad steel cables is spliced using standard fusion or mechanical splicing techniques:

• Fusion Splicing: The fiber ends are stripped of their protective coating, cleaned with alcohol, and precisely aligned in a fusion splicer. An electric arc melts and fuses the fibers into a continuous strand, resulting in minimal signal loss (typically ~0.02 dB) and high reliability. The splice is then protected with a heat-shrink sleeve to restore mechanical strength ( ).
• Mechanical Splicing: This method aligns the fiber ends inside a sleeve with an adhesive gel. It is faster and requires less expensive equipment but generally has slightly higher insertion loss and lower long-term durability ( ).

Handling the Aluminum-Clad Steel Layer

Aluminum-clad steel provides mechanical strength and protection but requires careful handling during splicing:

• Stripping the Armor: Use precision tools such as abrasive cutoff wheels or specialized cable strippers to remove the aluminum and steel layers without damaging the fiber inside. Kevlar or strength members should be cut close to the jacket ( ).
• Protective Sleeving: After splicing the fiber, slide a stainless steel tube or heat-shrink sleeve over the splice to restore mechanical integrity and protect against environmental factors like moisture and vibration ( ).
• Clamping and Alignment: Clamp the cable core in a vise during preparation to ensure precise cuts and alignment of the armored layers ( ).

Best Practices

• Cleanliness: Ensure all fiber surfaces are free of dust and debris using lint-free wipes and isopropyl alcohol ( ).
• Testing: Verify optical continuity and signal loss before finalizing the splice.
• Tools: Essential tools include a fusion splicer, fiber cleaver, strippers, heat-shrink sleeves, and a visual fault locator ( ).
• Safety: Wear protective gloves and eye protection when cutting metallic armor to prevent injury from sharp edges.

Summary

Splicing aluminum-clad steel optical cables involves a two-step process: first, carefully splicing the optical fiber using fusion or mechanical methods, and second, restoring the mechanical and environmental protection of the aluminum-clad steel using heat-shrink sleeves or stainless steel tubes. Following proper preparation, alignment, and protective measures ensures minimal optical loss and long-term durability of the cable ( ).