Fusion splicing provides a low-loss, highly reliable connection by melting and fusing fiber ends, making it ideal for long-haul applications, whereas fiber mechanical splicing offers a quick and practical solution for field repairs and temporary connections by. Fusion splicing provides a low-loss, highly reliable connection by melting and fusing fiber ends, making it ideal for long-haul applications, whereas fiber mechanical splicing offers a quick and practical solution for field repairs and temporary connections by. This is where fiber optic cable splicing—the process of creating a permanent, high-performance join between two fiber ends—becomes critical. For network managers and technicians, a poor splice can lead to significant signal degradation, network downtime, and costly troubleshooting. Whether repairing a broken cable or extending a fiber run, fiber optic splicing ensures light signals travel. As fiber optic connections become increasingly mainstream, the need to connect fiber optic cables to one another — or splicing — is also on the rise. Splicing is most commonly used in the field but has application in cable assembly houses. Infield. In the world of fiber optic networks, splicing is a crucial process that connects fibers together to form a continuous, high-performance network.