Laser transmitter of radio frequency waves. Free Technical Library News

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RF Laser Transmitter

08.05.2019

A group of researchers from Harvard University managed to broadcast an audio recording of one of the pieces of music using a radio transmitter, the key component of which was a semiconductor laser.

This laser is used as a source of radio frequency waves, a generator, in addition, it also performs the functions of modulating the transmitted and demodulating the received signals. These studies are the first steps towards the creation of new types of hybrid electronic photo-optical devices that will become the basis for the operation of ultra-high-speed wireless communication systems, Wi-Fi of the next generation.

The creation of a laser radio transmitter was a continuation of the work carried out by the researchers in 2017. Then scientists discovered that an infrared frequency comb created by a quantum cascade laser could be used to produce radio signals in the terahertz range, the submillimeter range of the electromagnetic spectrum. Signals in this range have the potential to transmit data in large quantities and at speeds far exceeding the capabilities of modern wireless communications. And in 2018, scientists found that quantum cascade lasers can work simultaneously as receivers and transmitters, very effectively encoding information in the emitted signals.

Unlike conventional lasers, which emit light at a single frequency, laser frequency combs emit a whole range of fixed frequencies at the same time. These fixed frequencies are evenly spaced along the spectrum line and resemble the teeth of a comb. And if you extract certain frequencies from the comb created by the laser, then the electrons inside the laser cavity begin to oscillate with microwave frequencies that are within the spectrum that can be used for wireless communications.

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