What is fusion splicer?

A fusion splicer is an instrument used to join two optical fibers together end-to-end using heat. The goal is to fuse the two fibers together in such a way that the light passing through the fibers is not scattered or reflected back at the splice, and so that the splice and region surrounding it are almost as strong as the intact fiber itself. It is commonly used in telecommunications and data networks to create long fiber optic links.