Fusion splicing typically works out as the preferred method of performing connections at the splitter and at the house for performance, reliability, and economic reasons. Fusion splicing differs from mechanical splices and connectors in that it directly fuses optical fibers together in a high quality process using a fusion arc. This produces a continuous connection between the fibers enabling very low loss light transmission. (Typical loss: 0.1 dB)

The result is a physical low loss bond between the fibers, free of air gaps and inclusions. In practical applications fusion splicers are used for this purpose. Fusion splicing is the most accurate and durable method of interconnecting optical fibers permanently. Mechanical splice and Fiber optic connectors are used for temporary joints.

After preparing the fiber ends, the fiber ends are inserted in the "V" grove of the splicer, aligned to each other and fused together. The crucial factor here is to align the fiber cores to each other as accurately as possible. Almost all the automatic fusion splicers having the facility of aligning the fibers automatically. During splicing the alignment and fusion process is shown on the monitor including the display of additional information like fiber offset values, fusion time, core eccentricity and the splice loss result.