Splice-on connectors are devices used to align, attach, and achieve continuity between optical fibers. They join two optical fibers where a connect/disconnect capability is required and also terminate fiber-optic connections. Understand the degree to which fiber alignment and fiber mismatch problems increase system loss. optical fibers are made comprised of exceedingly tiny strands of glass or plastic and these cables transfer information between two sites using completely optical. Fiber optic cable splicing involves joining two fiber optic cables together.