An optical transistor, also known as photonic transistor, optical switch or light valve, is a device that switches or amplifies optical signals. At their simplest, they operate as on/off gates, allowing light to pass with low insertion loss in the open state and blocking transmission (causing high insertion loss) when closed. They're a core component in fiber-optic networks, where data travels as pulses of light through glass fibers. The basic principle behind an optical switch is to control the direction of light propagation through various mechanisms, such as mechanical movement, electro-optic effects, or thermo-optic. An Optical Circuit Switch is a network switch where signals stay in the optical domain from source to destination, avoiding the power-hungry Optical-Electrical-Optical (O-E-O) conversions typical in standard switches. Unlike traditional switches that process packets electrically, OCS devices act as.
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