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144 Optical Cable Splicing Process

Specialty cable knowledge brief Published 01 Jul 2025

Prepared for preliminary research by the ZITHA SPECIALTY knowledge desk. Confirm fire performance, mechanical protection, loss budgets and installation requirements against current standards and product documentation.

Fusion splicing of 144-core optical cables is the preferred method, using ribbonized fibers and mass fusion splicing for low-loss, high-density connections.Overview

Splicing a 144-core optical cable involves joining multiple fibers to create a continuous optical path with minimal signal loss. High-count cables like 144-core are typically ribbonized, meaning fibers are grouped in 12-fiber ribbons, which allows for mass fusion splicing rather than splicing each fiber individually, improving efficiency and reducing errors .

Tools and Materials Needed
  • Fusion splicer capable of handling ribbon fibers
  • Fiber cleaver for precise end preparation
  • Stripping tools to remove the outer jacket and buffer coatings
  • Isopropyl alcohol and lint-free wipes for cleaning fibers
  • Splice protection sleeves to secure the spliced fibers
  • Microscope or inspection device to verify cleave quality and alignment
Step-by-Step Fusion Splicing Process
  1. Cable Preparation:
    • Strip the outer jacket and sub-unit tubes to expose the ribbons.
    • Separate the 12-fiber ribbons carefully, avoiding stress or bending beyond the minimum radius (typically >30 mm), .
  2. Fiber Cleaning and Cleaving:
    • Clean each fiber with an IPA-soaked swab to remove oils and debris.
    • Use a precision cleaver to create a flat, mirror-like end on each fiber. Poor cleaving can cause high splice loss .
  3. Ribbon Alignment:
    • Place the 12-fiber ribbon into the fusion splicer's V-groove.
    • Ensure all fibers are aligned correctly; ribbon splicers can handle multiple fibers simultaneously.
  4. Fusion Splicing:
    • Initiate the splicing process using the splicer's electric arc.
    • The splicer melts and fuses the fiber ends, creating a permanent, low-loss joint.
    • Typical insertion loss for ribbon fusion splices is around 0.1 dB per fiber .
  5. Splice Protection:
    • Slide a protective sleeve over the spliced ribbon and heat-shrink it to secure the joint.
    • Organize the ribbons in the splice tray to prevent bending or stress.
  6. Testing and Verification:
    • Inspect each splice under a microscope to ensure proper alignment and minimal back reflection.
    • Perform optical time-domain reflectometer (OTDR) testing to verify signal integrity across all fibers.
Best Practices
  • Always handle fibers gently to avoid microbends or stress.
  • Use manufacturer-recommended consumables for splicing and protection sleeves.
  • Ribbon splicing is preferred for high-density cables like 144-core to save time and reduce cumulative splice loss .
  • Maintain a clean work environment to prevent contamination, which can degrade splice quality.
Summary

For a 144-core optical cable, the most efficient and reliable method is mass fusion splicing of 12-fiber ribbons, ensuring low insertion loss, high reliability, and organized cable management. Mechanical splicing is generally reserved for temporary or emergency repairs, while fusion splicing is standard for permanent, high-performance installations .

144 Optical Cable Splicing Process - ZITHA TECH SPECIALTY CABLES (Pty) Ltd [PDF]

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