How to fuse two pigtails in a dual-core cable

Fusion splicing two pigtails into a double-core cable involves carefully preparing the fibers, aligning them in a fusion splicer, and creating a low-loss, permanent connection.Tools and Materials Needed

• Fusion splicer: Aligns and melts the fiber ends together for a seamless connection .
• Fiber strippers: Remove the outer jacket and coating without damaging the glass core .
• Precision cleaver: Cuts the fiber ends cleanly and perpendicularly .
• Isopropyl alcohol and lint-free wipes: Clean the bare fibers before splicing .
• Heat shrink tubes: Protect the splice after fusion .

Step-by-Step Fusion Splicing Process

1. Prepare the Cable Strip back the outer jacket of the double-core cable to expose the two fibers. Carefully remove the aramid strength members and the primary buffer coating using fiber strippers, exposing about 35mm of bare fiber .
2. Clean the Fibers Wipe the bare fiber ends with isopropyl alcohol using lint-free wipes. The fiber should squeak slightly when clean, indicating it is free of dust and oils .
3. Cleave the Fibers Use a precision cleaver to cut the fiber ends cleanly and perpendicularly. Proper cleaving ensures minimal signal loss and a smooth fusion joint .
4. Insert Fibers into the Fusion Splicer Place each fiber into the splicer's V-groove or alignment channel. Modern splicers use cameras to align the fiber cores precisely .
5. Perform the Fusion Splice Activate the splicer to create an electric arc that melts the fiber ends together. The splicer will automatically align, heat, and fuse the fibers, forming a continuous optical path .
6. Protect the Splice Slide a heat shrink tube over the splice and apply heat to secure and protect the joint from mechanical stress .
7. Test the Connection Use a fiber tester or optical time-domain reflectometer (OTDR) to verify the splice quality. Check for low insertion loss and minimal reflectance to ensure a reliable connection .

Safety and Best Practices

• Work in a clean, dust-free environment to prevent contamination .
• Handle fibers carefully to avoid bending or breaking the glass cores .
• Dispose of fiber scraps safely, as they can penetrate skin .
• Never look directly into a live fiber connector to avoid eye damage . By following these steps, you can successfully fuse two pigtails into a double-core cable, achieving a stable, low-loss optical connection suitable for high-performance data transmission .