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Outdoor optical cable 36-core fiber fusion splicing

Fusion splicing a 36-core outdoor fiber cable requires proper cable preparation, a suitable splice closure, and careful handling to ensure reliable, weather-resistant connections.Cable Selection and Preparation

For outdoor installations, loose tube or ribbon cables are commonly used. Loose tube cables contain fibers in buffer tubes around a central strength member, while ribbon cables group fibers in flat arrays for mass fusion splicing, which is faster for high fiber counts like 36 cores . Outdoor cables may be gel-free (dry) or gel-filled, with gel-free cables simplifying splice preparation and reducing cleanup . If the cable is to be buried, armored cables provide mechanical protection against rodents and environmental stress . Before splicing:

  • Strip the outer jacket carefully without damaging the fibers.
  • Remove any water-blocking elements if present.
  • Clean and cleave each fiber precisely using a high-quality cleaver.
Splice Closure Selection

A dome-type or inline outdoor splice closure is recommended for 36-core cables. These closures provide IP68-rated protection against dust and moisture and allow for aerial, duct, pole-mounted, or direct-buried installations . Ensure the closure has splice trays with sufficient capacity; for 36 fibers, a closure with at least 3 trays of 12 splices each or a single 36-count tray is suitable . Closures often support both single fusion and mass fusion splices, giving flexibility depending on cable type .

Fusion Splicing Process
  1. Organize fibers in the splice tray to prevent bending below the minimum bend radius.
  2. Align fibers in the fusion splicer according to manufacturer instructions.
  3. Perform the fusion splice, ensuring low splice loss and proper arc calibration.
  4. Protect each splice with a heat-shrink sleeve or mechanical protector.
  5. Route fibers neatly in the tray, leaving slack for future maintenance.
Installation Considerations
  • Maintain proper bend radius throughout the closure and cable routing.
  • Seal the closure using LOCK-TAPE or C-Cement technology to prevent moisture ingress .
  • Label fibers clearly for future troubleshooting or network expansion.
  • For ribbon cables, consider mass fusion splicing to reduce splicing time and improve consistency . By following these steps and using the appropriate outdoor-rated splice closure, a 36-core fiber cable can be reliably spliced for long-term outdoor deployment, ensuring network integrity and protection against environmental factors .
Outdoor optical cable 36-core fiber fusion splicing

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