DWDM takes advantage of a physical phenomenon that allows multiple wavelengths of light to travel simultaneously through a single-fiber cable.

FM audio transmitter for Hobby use

The presented plan is realized for hobby use, advised to the persons who want to approach electronics and in particular to experience the basics of radio frequency. To succeed to transmit the own voice or to listen if in the other room the children are crying or sleeping, can give an enormous satisfaction to the hobbyist.