Fusion splicing involves the use of localized heat to melt together or fuse the ends of two optical fibers. The preparation process involves removing the protective coating from each fiber, precise cleaving, and inspection of the fiber end-faces. 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. And because fiber optic cables carry light instead of. rk with current AFL/Fujikura, Sumitomo, Fitel/Furukawa and UCL Swift/Ilsintech fusion splicers. more How to Choose Heating Mode for Fiber Optic Splicing Machine?|Fusion.