Fiber splice loss measures how much signal drops when you join two fiber ends. Many factors, like core mismatch and contamination, can increase splice loss. The performance of a fiber optic splice is determined by a number of factors, including the quality of the fiber, the cleanliness of the splice, and the techniques used to make the splice. Poor Fiber Cleave: Angled or chipped cleaves prevent proper. At 0. 2dB/km (typical SMF-28e+ at 1550nm), you've got 20dB of loss due to the glass path, but then the 10 splices would add another 5dB if your splices are 0. 5dB (a *really* bad splice) each. Splicing is typically required during cable installation, maintenance, or network expansion. The goal is to achieve the lowest possible optical loss (signal.