It describes three main splicing methods - de-matable connectors, mechanical splices, and fusion splices. Fusion splicing welds two fibers together using an electric arc and provides the lowest loss. The goal is to achieve the lowest possible optical loss (signal. In this guide, we cover the basics of fiber optic splicing, how to perform splicing using two different methods, and finally some best practices to perform good fiber splicing. What is Fiber Optic Splicing and Why is it Needed? – #1.