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Method for connecting fiber optic cables to a cold splice

Fiber optic splice closure knowledge brief Published 02 Dec 2022

Prepared for preliminary research by the RIVO OPTICAL knowledge desk. Confirm cable count, splice capacity, sealing class, tray layout, protection sleeves and installation requirements against current standards and product documentation.

Cold splicing, or mechanical splicing, connects fiber optic cables using a mechanical connector without heat, aligning fibers precisely for light transmission.Tools and Materials Needed
  • Fiber stripping tool to remove protective coatings
  • Fiber cleaver for precise cutting
  • Mechanical splice connector (ferrule and body)
  • Alcohol swabs for cleaning
  • Optical power meter or visual fault locator for testing
Step-by-Step Procedure

1. Prepare the Fiber Strip the outer protective layers of the fiber cable carefully using a fiber stripping tool. Clean the exposed fiber with alcohol swabs to remove dust or debris, which can interfere with the splice and increase signal loss . 2. Cleave the Fiber Use a fiber cleaver to cut the fiber ends cleanly and evenly. A smooth, perpendicular cleave is critical for proper alignment and minimal light loss . 3. Insert Fiber into the Ferrule Place each prepared fiber end into the ferrule of the mechanical connector. The ferrule holds the fiber in place and ensures precise alignment with the other fiber . 4. Secure the Ferrule in the Connector Body Insert the ferrule into the connector body. The body stabilizes the ferrule and maintains the connection between the two fibers . 5. Apply Index-Matching Gel (if required) Some mechanical splices use an index-matching gel inside the connector to reduce reflection and signal loss. Ensure the gel is applied correctly if your connector requires it . 6. Test the Connection After splicing, test the fiber using an optical power meter to measure light transmission and a visual fault locator to check for visible faults. Proper testing ensures the splice is aligned and functioning correctly .

Tips for a Successful Cold Splice
  • Cleanliness: Always keep fibers and connectors free from dust and oils. Contamination can cause attenuation or reflection .
  • Precision Cleaving: Ensure the cleaver is calibrated and produces a smooth, even cut. Uneven cleaves can degrade performance .
  • Temporary vs. Permanent Use: Mechanical splices are ideal for quick repairs, field installations, or temporary connections. For permanent, high-performance networks, fusion splicing is preferred due to lower signal loss and higher durability . Cold splicing is a cost-effective, fast, and practical method for connecting fiber optic cables, especially in field repairs or emergency situations, without requiring expensive fusion equipment .

Method for connecting fiber optic cables to a cold splice - RIVO MULTITRADE OPTICAL SYSTEMS [PDF]

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Technical note

This reference is intended for preliminary fiber optic splice closure research. Compatibility, splice capacity, sealing class, tray layout, protection sleeves, installation methods, test limits and applicable standards must be verified for the specific project.

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