In this video, you'll see the full fiber splicing process — from fiber preparation, cleaving, and fusion splicing to final testing. 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. more Learn how to splice fiber optic cable step by step in this complete guide! In this. What is Fiber Optic Cable Splicing and Why is It Critical? Fiber optic splicing is the process of joining two optical fibers end-to-end., FTTH, FTTP, FTTM), splicing is essential for extending cables, repairing breaks, or connecting backbone and distribution lines. When done poorly, it can lead to significant signal degradation, network downtime, and costly rework.