The split ratio indicates how the input signal is divided. The power of the input . A beam splitter (or beamsplitter, power splitter) is an optical device which can split an incident light beam (e. a laser beam) into two (or sometimes more) beams, which may or may not have the same optical power (radiant flux). It is a crucial part of many optical experimental and measurement systems, such as interferometers, also finding widespread application in fibre optic telecommunications. For example, in quantum information the beam splitter plays essential roles in teleportation, bell measure-ments, entanglement and in fundamental studies of the photon. Beamsplitters are often classified according to their construction: cube or plate. This principle allows a single input light beam to be split into N output light beams.
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