Photodiode Light detector in a fiber optic signal transport system that generates an electric current in proportion to the intensity of the light falling on it. A device that converts electrical current to a DC voltage, for the monitoring of the optical power. In semiconductor technology, a way of creating a circuit pattern on a chip by exposing areas covered by a sensitive film to light. The light-sensitive film is known as a photoresist or resist. The fundamental unit of light and other forms of electromagnetic energy.
Photons are to optical fibers what electrons are to copper wires.
In communication technology, the use of fundamental particles of light, called photons, to form coded light pulses that convey information in digital form. Photophone One of Alexander Graham Bell's many bright ideas. The device used sunlight, reflected by mirrors, to transmit conversations. It worked fine, but only in good weather and daylight. In chip circuit design, light-sensitive material that is applied as a thin film on the surface of a wafer.