For Mechanical Splicing: Align the fiber ends manually in a mechanical splice holder with index-matching gel. Place the protected splice inside a splice tray. Fiber optic cable splicing involves joining two fiber optic cables together. Another method of connecting optical fibers is termination or connectorization, which consists of processing the end of a fiber optic bundle so that it can be connected to other fibers or devices through fiber optic. In this guide, we cover the basics of fiber optic splicing, how to perform splicing using two different methods, and finally some best practices to perform good fiber splicing. Ensure Your Splicing Tools are Clean – #2. Whether in data centers, telecom rooms, or outdoor FTTx deployments, proper splicing inside a fiber enclosure ensures low signal loss, long-term stability, and easy maintenance.