What is the optical receiver connected to
Modern fiber-optic communication systems generally include optical transmitters that convert electrical signals into optical signals, to carry the signal, optical amplifiers, and optical receivers to convert the signal back into an electrical signal. It's the endpoint of any fiber optic link, sitting at the far end of the cable and translating pulses of infrared light into the ones. The light is a form of carrier wave that is modulated to carry information.
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