It is an optical fiber tandem device with many input and output terminals, especially applicable to a passive optical network (EPON, GPON, BPON, FTTX, FTTH etc. Fiber optic splitter, also referred to as optical splitter, fiber splitter or beam splitter, is an integrated waveguide optical power distribution device that can split an incident light beam into two or more light beams, and vice versa, containing multiple input and output ends. Optical splitter. In the intricate web of modern fiber optic networks, where data travels at the speed of light across continents, fiber optic splitters play a silent yet pivotal role. Conversely, it can also combine multiple signals into one. They carry data at the speed of light.