The best splicers offer core alignment, fast splice times, durable designs, and smart features like cloud syncing and automated calibration. Furukawa Electric and Lightera have introduced a new class of fusion splicer technology designed to support emerging optical fiber types, including hollow-core fibers (HCF) and multi-core fibers (MCF). The FITEL S185-ROF range of splicers offers rapid and precise rotational alignment for both multi-core and hollow core ecosystems, in a compact package. Hollow core fiber is a type of optical fiber that guides light through an air core rather than solid glass. Top-rated models. When it comes to optical fiber fusion splicers, no other company in the world can match Sumitomo Electric Lightwave for innovation, speed, and performance.