Fiber “Cold Splicing” Technology

International Zone (English) OFSCN Knowledge Base
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How is emergency repair achieved using mechanical connectors when a fusion splicer is unavailable?

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When a fusion splicer is unavailable, emergency fiber repair using mechanical connectors is achieved by precisely aligning and securing two cleaved fiber ends within a specialized connector body.

Here’s how it generally works:

  1. Fiber Preparation: The damaged fiber ends are stripped of their protective coatings, cleaned, and precisely cleaved to create a flat, perpendicular end face.
  2. Fiber Insertion: Each cleaved fiber end is inserted into opposite sides of the mechanical connector. The connector typically contains a pre-loaded gel or index-matching fluid to minimize reflection and loss.
  3. Alignment and Securing: Inside the connector, a V-groove or similar mechanism passively aligns the cores of the two fibers. A crimping tool or a similar locking mechanism is then used to secure the fibers in place, ensuring continuous physical contact and optical alignment.

Advantages for Emergency Repair:

  • Speed: Mechanical connectors offer a much faster repair solution compared to fusion splicing, as they eliminate the need for power, arc calibration, and cooling time.
  • Portability: They require minimal tools, making them ideal for field repairs in remote locations or where power is scarce.
  • No Splicer Needed: The primary benefit for your scenario is that a fusion splicer is not required.

Considerations:

  • Loss: Mechanical splices generally have higher insertion loss (typically 0.1 dB to 0.5 dB) and reflectance compared to fusion splices, which average around 0.02 dB.
  • Long-term Stability: While excellent for emergency and temporary fixes, mechanical splices might be less stable over very long periods or in harsh environments compared to fusion splices, which create a permanent, homogenous joint.

OFSCN® offers various standard fiber patch cords terminated with common connector types like FC/APC, ST, LC, and SC. These connectors are essential for connecting fiber segments, whether those segments have been factory-terminated or field-repaired using methods like mechanical connectors.

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