It consists of three layers: substrate, waveguide and cover. Waveguides play a key role in the splitting process that allows a specific percentage of light to pass through. So the signal can be divided equally. 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 optical network system uses an optical signal coupled to the branch distribution.