Abstract: A spatial light modulator (SLM) has electrically controllable microelectromechanical reflectors arranged in a chain-like manner along an axis such that an optical beam propagates by reflection from an input down the chain to an output. Each reflector can be moved to a selected one of a number of discrete switching positions. The position determines the angle at which the beam is reflected toward the next reflector in the chain. The combination of positions in which the reflectors are oriented is determinative of the angle at which the signal exits the output. The SLM can be included in a switch. An SLM in the input section of the switch can be adjusted to direct the beam such that it impinges upon a selected switch output. Multiple SLMs can be included in an array to provide a cross-connect or crossbar switch.