1. Onoprienko N. E-71

3. LED or light emitting diode - a semiconductor device with a pn junction created by the optical radiation by passing electric current through it in the forward direction.

4. Photodiode - optical receiver that converts the incident on the photosensitive area of its light into an electric charge

5. Laser - an optical quantum generator - a device that converts the energy of the pump (light, electrical, thermal, chemical, etc.) into the energy of the radiation flux.

6. FOR ELECTRICAL CIRCUITS ARE SEPARATE DEVICES OPTOELECTRONICS. Or optocoupler optocoupler - electronic device consisting of a light emitter and the photodetector associated optical channel and usually united in a common housing.