An optical coupler helps split or join light signals in a fiber network. A detector. The answer is yes, and it's a practice widely used in the industry to distribute signals to multiple destinations without degrading the signal quality significantly. What is Fiber Line. 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. The role of these splitters in optical networks is crucial as they allow a single optical signal to be shared. Optical cables, also known as fiber optic cables, consist of thin strands of glass or plastic fibers surrounded by a protective casing.