A standard laboratory beamsplitter often employs a 50/50 ratio, meaning half the incident light is reflected and half is transmitted. This ratio is precisely controlled by applying specialized thin-film coatings to the optical surface. The device is purely. By dividing a single optical signal from a central Optical Line Terminal (OLT) into multiple outputs for Optical Network Terminals (ONTs) at users' homes, splitters eliminate the need for dedicated fibers to each residence—slashing infrastructure costs while scaling network reach. It is a crucial part of many optical experimental and measurement systems, such as interferometers, also finding widespread application in fibre optic telecommunications.