The fusion splicer is used for splicing two optical fibers end-to-end by fusion (sometimes we say, welding or heating). The goal is to fuse the two fibers together in such a way that light passing through the fibers is not scattered or reflected back by the splice, and so that the splice and the region surrounding it are almost as strong as the virgin fiber itself. The source of heat is usually an electric arc, but can also be a laser, or a gas flame, or a tungsten filament through which current is passed. A good automatic fusion splicing machine (welding machine), which can work automatically and with more permanent connection compared with mechanical splice, with low-loss, high-strength joint. It is a indispensable tools for fiber OSP and indoor cable network installation.
Currently, There are two aligning system used for fusion splicer which is Core alignment system and cladding alignment system.