Fusion splicing is the preferred choice when optical performance, durability, and long-term reliability are critical. Optical fiber transmission has the advantages of wide transmission frequency, large communication capacity, low loss, no electromagnetic interference, small diameter of optical cable, light weight, rich source of raw materials, etc., so it is becoming a new transmission medium. While the cold cure method if the oldest, is still yet very common with toolkits more affordable compared to fibre. Fiber optic splicing is a foundational technique in optical network deployment. Whether you are extending fiber runs, repairing damaged links, or building complex networks such as PON / PoF (Power over Fiber) infrastructure, understanding the differences among mechanical splicing, fusion splicing. Fiber optic cabling is a critical component of modern telecommunications infrastructure, owing to its high bandwidth, reliability, durability, and cost-effectiveness. During the installation of this infrastructure there arise many situations that require the joining of one optical fiber to another. In practice, most fibre terminations are done using either fusion Splicing or mechanical Splicing. The most reliable and widely used splicing method.