Beam splitters, including fiber optic splitters, are passive devices and do not require a power supply.

Beam splitters are optical devices designed to divide an incoming light beam into two or more separate beams, either by reflection and transmission or by polarization states . They are widely used in interferometers, fiber optic networks, and other optical systems. Standard types include plate beamsplitters, cube beamsplitters, pellicle beamsplitters, and fiber optic splitters . Passive Operation: Most beam splitters, including fiber optic splitters, operate passively. They do not contain electronic components and do not generate or require electrical power to function. The splitting of light occurs purely through optical mechanisms such as partial reflection, transmission, or polarization separation . Fiber Optic Splitters: In fiber optic networks, splitters divide light from one input fiber into multiple output fibers. These devices are entirely passive, meaning they rely solely on the optical properties of the materials and coatings used, without any external power supply . The output power in each branch depends on the splitting ratio, but no electrical input is needed. Exceptions: While standard beam splitters are passive, some specialized optical devices that incorporate active elements, such as modulators or variable attenuators, may require power. However, these are not typical beam splitters and are considered separate components. In summary, a conventional beam splitter does not require a power supply, and its operation is purely optical, making it a passive component in both free-space and fiber optic systems .