What is optical coupler/Optical coupling ?

The medium of optical coupler to transmit electrical signals. It has good isolation effect to input and output electric signal, so it has been widely used in all kinds of circuit. Optical coupler has become the most species, use one of the most popular photoelectric device. Optocoupler generally consists of three parts: optical transmitter, optical receiving and signal amplification. Input signal drive light-emitting diodes (leds), to a certain wavelength of light, by the light detector and photocurrent generation, again after further amplification output. This completes the transformation of electricity, light, electricity, which have the effect of input, output, isolation. By the optical coupler isolation from each other between input and output, electrical signal transmission has many characteristics, such as one-way, thus has good electrical insulating ability and anti-interference ability. So it as the end in the long term transport information isolation device can greatly improve the signal-to-noise ratio. In computer digital communication and real time control as signal isolation interface device, can greatly improve the reliability of the computer.
And by the optical coupler work belong to the input end of the current model of low resistance components, thus has strong common mode rejection capability.