Fiber optic splitters, also referred to as optical splitters, fiber splitters, or beam splitters, are integrated waveguide optical power distribution devices that split an incident light beam into two or more light beams, and vice versa. It is a crucial part of many optical experimental and measurement systems, such as interferometers, also finding widespread application in fibre optic telecommunications. Additionally, beamsplitters can be used in reverse to combine two different beams into a single one. a laser beam) into two (or sometimes more) beams, which may or may not have the same optical power (radiant flux).