Yes, a fusion splicer can handle both single-mode and multimode fibres. But let's unpack that a bit because there are a few key details you'll want to understand before jumping into a splicing job. Fiber optic splicing is the process of joining two optical fibers end-to-end. Unlike using connectors, which are designed for frequent connection and disconnection at patch panels, splicing creates a permanent, stable joint with minimal light loss. Splicers are commonly used in: Core vs.