Infrared wireless systems require that each device have two components: an emitter, which
transmits a signal, and a detector, which receives the signal. (These two components are
almost always combined into one device.) An emitter is usually a laser diode or a lightemitting
diode (LED). Infrared wireless systems send data by the intensity of the light wave
instead of whether the light signal is on or off. To transmit a 1, the emitter increases the
intensity of the electrical current and, consequently, the intensity of the infrared light, which
indicates a pulse to the receiver. The detector senses the higher-intensity pulse of light and
produces a proportional electrical current