The simplest method: join two pre-terminated cables via a coupler (also called an adapter). The coupler aligns the two connector ferrules using a zirconia sleeve. This article explains when and how to use each one — from fusion splicing (the highest performance) to the mechanical coupler (the simplest, with no specialised tools). Why join two fibre optic cables? Common situations. Precise optical fiber splicing reduces signal loss, improves network reliability, and extends infrastructure lifespan. This guide breaks down the fundamentals of optical fiber splicing, compares. Fusion splicing provides a low-loss, highly reliable connection by melting and fusing fiber ends, making it ideal for long-haul applications, whereas fiber mechanical splicing offers a quick and practical solution for field repairs and temporary connections by using a junction to align and hold. This is where fiber optic cable splicing—the process of creating a permanent, high-performance join between two fiber ends—becomes critical. For network managers and technicians, a poor splice can lead to significant signal degradation, network downtime, and costly troubleshooting. Ensure Your Splicing Tools are Clean – #2.