Functions of a Three-Port Fiber Optic Circulator
An optical circulator is a three- or four-port designed such that entering any port exits from the next. This means that if light enters port 1 it is emitted from port 2, but if some of the emitted light is reflected back to the circulator, it does not come out of port 1 but. Circulators are integrated into Optical Amplifiers, such as Erbium-Doped Fiber Amplifiers (EDFAs), where they manage the high-power pump light required for signal boosting.
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