Researchers at the Harvard School of Engineering and Applied Sciences. John A. Paulson were the first to use a semiconductor laser to transmit microwave signals. They used a hybrid emitter - it emits photons at different frequencies, and those, under certain conditions, can enter into resonance. This generates oscillations of electrons at microwave frequencies in the communication spectrum, which made it possible to link laser radiation and radio waves.
In the course of the experiments, the scientists modernized one of the electrodes, making a slot in it and thereby turning it into an analog of a dipole antenna. The next stage was long experiments on modulating laser radiation in order to streamline its nature, to create patterns for coding information in pulses. It remains to add a horn antenna, as well as a signal decoding module, and we have a communication system.
Scientists have successfully managed to encode, transmit, receive and decode information in a new way. The advantage of this type of communication is obvious - the laser operates in the terahertz range, providing phenomenal data transfer rates. Plus, the device is made according to the "all-in-one" scheme, which promises prospects for further miniaturization and the use of new communication systems for the Internet of Things. However, the authors of the study admit that they are still only at the origins of the new technology.