Precise optical fiber splicing reduces signal loss, improves network reliability, and extends infrastructure lifespan. Fiber optic pigtails are used to connect fiber optic cables using fusion or mechanical splicing. What is a mechanical splice? What is a fusion splice? Why splice? Fiber splicing is one way to join two optical fibers together so the light energy from one optical fiber can be transferred to another. Fiber optic splicing is the process of joining two fiber optic cables together so that light signals can pass with minimal loss or reflection. That is usually done for permanent connections, but it may be possible to dismantle a splice without spoiling the fiber ends.