Low Insertion Loss: Fusion splicing has an average loss of only 0. High Durability: Ideal for permanent installations. Better for High Bandwidth: Supports faster data transfer with minimal signal. Fiber optic splicing is the process of joining two fiber optic cables together so that light signals can pass with minimal loss or reflection. There are two primary. Fiber optic cables are the invisible highways of our digital world, carrying massive amounts of data at the speed of light. But what happens when you need to join two cables to extend a network or repair a break? You can't just twist them together.