Learn how to splice fiber optic cable using fusion splicing with this complete step-by-step guide. Includes tools, best practices, loss standards (ITU-T G. 652), cost analysis, and FAQs for network engineers and installers. Therefore, we will also touch on cost factors, risk management, and best practices in. Page 1 The FOSC 450 fiber optic splice closures use compressed-gel cable seals to environmentally seal fiber cable splice points. When Do You Need to Splice Fiber Optic Cables? Fiber optic cable splicing. This guide reveals the secrets to fusion splicing with little fluff—just proven, straightforward techniques refined from years of work in the field. Our. Fusion splicing is used for joining cables during network installation projects, repairing cables, mounting pre-polished splice-on connectors, and many applications in factories that make fiber optic components and subsystems. For both field and factory splicing, the process requires the following.