By aligning the fibers precisely and applying a controlled electric arc, the fusion splicer melts the ends of the fibers, creating a single, continuous fiber. This method boasts minimal insertion loss and negligible back reflection, ensuring robust connections that stand the test of time. A Fusion Splicer uses. This article explains the principle of fusion splicing, a common method for making permanent low-loss fiber splices by melting and fusing two fiber ends together, typically with an electric arc. 02 dB. Field-terminating connectors is a meticulous, high-pressure process where even a tiny mistake can force you to cut the fiber and start all over again. This is exactly why most professional installers have moved away from field-termination and toward splicing.