In fusion splicing, a machine precisely aligns the two fiber ends and uses the heat generated by an electric arc to “fuse” or “weld” the glass ends together. This creates a continuous connection between the fibers, resulting in low-loss optical transmission. Unlike connectors, which allow temporary links, a fiber optic cable splice fuses fibers for minimal signal loss—e. Fiber optic strands are ultra-lightweight and about as thin as human hair, and yet, they have more than eight times the pulling tension of a copper wire., FTTH, FTTP, FTTM), splicing is essential for extending cables, repairing breaks, or connecting backbone and distribution lines.