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An '''optical transistor''', also known as an [[optical switch]] or a [[light valve]], is a device that switches or amplifies [[signal#Analog and digital signals|optical signals]]. Light occurring on an optical transistor's input changes the intensity of light emitted from the transistor's output while output power is supplied by an additional optical source. Since the input signal intensity may be weaker than that of the source, an optical transistor amplifies the optical signal. The device is the optical analog of the [[transistor|electronic transistor]] that forms the basis of modern electronic devices. Optical transistors provide a means to control light using only light and has applications in [[optical computing]] and [[fiber-optic communication]] networks. Such technology has the potential to exceed the speed of electronics{{Citation needed|date=March 2020}}, while conserving more [[Power (physics)|power]].
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