The main function of the coupler is to split a portion of the power, which is named after the size of the coupling port.
In a microwave system, it is often necessary to split the microwave power in proportion to several paths. This is a problem of power distribution. The component that implements this function is called a power distribution component, that is, a coupler, and mainly includes: a directional coupler, a power splitter, and various microwave branch devices.
An optocoupler is an electro-optical-electrical conversion device that transmits electrical signals using light as a medium. It consists of a light source and a light receiver. The light source and the light receiver are assembled in the same sealed housing, separated from each other by a transparent insulator. The pin of the light source is the input end, and the pin of the light receiver is the output end. The common light source is the light emitting diode, the light receiver is the photodiode, the phototransistor and the like. There are many types of optocouplers, such as photodiodes, phototransistors, photoresistors, photocontrol thyristors, photodarlingtons, and integrated circuits.