Beam splitters in PON networks are often made with single-mode optical fiber, by exploiting evanescent wave coupling between a pair of fibers to share the beam between them. Different types of beam splitters exist, as described in the. 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. It is a crucial component in Passive Optical Networks (PON) and Fiber to the Home (FTTH) deployments. Conversely, it can also combine multiple signals into one.