144 Optical Cable Splicing Steps

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 .