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Replacing electronic switches with purely optical ones will become the technological linchpin for networks that transmit trillions of bits each second. One photonic device for optical switching is the MicroElectroMechanical System (MEMS) in which a tilted mirror bounces a lightwave from an incoming fibre on to a reflector, off another mirror and into an outgoing fibre. Other devices, such as liquid crystal switches and nonlinear optical switches, are also described. (Abstract quotes from original text)