Consider a 600 m OM4 run with two LC connectors and four intermediate splices. If your application allows ≤ 3. 0 dB end‑to‑end, fusion leaves ~1. Both can pass, but fusion provides more headroom for future adds, temperature drift. Multimode fibers can be harder to fusion splice as the larger core with many layers of glass that produces the graded-index profile are sometimes harder to match up, especially with fibers of different types or manufacturers. Therefore, we will also touch on cost factors, risk management, and best practices in. There are many possible ways to put two or more cables together or drop a single fiber at a location. Low Fusion Splice Loss Technique for Multicore Fiber Abstract: Splice loss of 4-core fiber using 2-electrode fusion splicer by automatic rotational alignment.