A fiber splitter, also known as a beam splitter, is an optical device that divides an incoming fiber optic signal into two or more separate output fibers. Unlike active devices (which require power), splitters operate without electricity, relying solely on the physics of. Fiber optic cables are essential components in modern telecommunications, offering high-speed data transmission over long distances. Splitting. DWDM/CWDM is like a two-edged sword. The downside is that once you loose your one-and-only fibre link (to a cable-hunting-buck-hoe) then you're in trouble. This ethernet will then go through a 1 Gbit/s switch, and rout two ethernet cables to each floor.