This review explores current state-of-the-art technologies—including fusion and mechanical splicing, laser cleaving, automation, real-time monitoring, novel materials, and environmental protections—and discusses future trends such as artificial intelligence integration . This review explores current state-of-the-art technologies—including fusion and mechanical splicing, laser cleaving, automation, real-time monitoring, novel materials, and environmental protections—and discusses future trends such as artificial intelligence integration . Creating these crucial fiber optic networks involves joining together separate fiber optic cables and the individual fiber optic strands in a process called splicing. These splices can be accomplished by precisely clamping together two bare fiber optic stand ends in a sleeve, or, now more commonly. Optical fiber technology is rapidly evolving. New fiber designs are taking over, such as multicore, hollow-core, ultra-thin, or tapered fibers. They offer lower latency, higher capacity and transmission, and unlock new possibilities in telecommunications, industrial lasers, and photonics. Poor fiber splicing, on the other hand, can lead to performance issues and increased maintenance costs. With the rapid expansion of high-speed networks, 5G deployment, and data centers, ensuring low-loss, durable, and cost-efficient splices is more critical than ever. This review. Sumitomo Electric Industries, Ltd. Over the years, optical fiber fusion splicing technology has been making steady progress with the advancement of optical fiber production technology and the development.