Optical proximity detector characteristics

Photocoupler

After the optical signal is transmitted through the optical fiber to the receiving end, there is an element at the receiving end that receives the optical signal. However, since our understanding of light has not yet reached the level of understanding of electricity, we cannot obtain the original signal by direct reduction of the optical signal. There is also a process between them that converts the optical signal into an electrical signal, which is then amplified by the electronic circuit, and finally restored to the original signal. This receiving conversion element is called a photodetector, or a photodetector, or simply a detector, also called a photodetector or a photodiode.