The transfer of data streams using the terahertz (THz) spectral region can meet the ever-growing demand for unprecedented data rates, i.e. However, it is very difficult to develop physical components that go beyond the most basic processing functionality to build future communication systems at THz frequencies. Postdoctoral fellow Junlian Dong and an international team of scientists led by Professor Roberto Marandotti of the Institute for National Research (INRS) have developed a new waveguide to overcome these limitations. Their work, the first in the field, was published in a journal The nature of communication.
In their work, the scientists proposed a new approach to the implementation of broadband THz signal processing in metal wire waveguides by designing wire surfaces. They act as tubes for electromagnetic waves and limit their propagation.
“We demonstrate that by engraving cleverly designed grooves with multiscale structures directly on metal wires, we can change which frequencies are displayed or transmitted (i.e., THz Bragg lattice) without adding material to the waveguide.”
This concept is used for the first time in THz mode. This provides unprecedented flexibility with respect to the manipulation of THz pulses propagating in waveguides, which in turn allows more complex functions to be handled. For example, we might think of “holographic messaging” in 6G, compared to SMS and voicemail in 1G and 2G.
In addition to transporting data streams, innovative THz waveguides can provide versatile signal processing functions. The distinctive advantages of metal wire waveguides, including structural simplicity, bending tolerance, and similarities with cables for connections, make them very promising. However, the strict restriction limits the possible ways of manipulating the propagation of THz waves.
As proof of the concept, researchers are introducing a completely new waveguide geometry: the four-wire waveguide (FWWG), which is capable of withstanding two independent waves that are polarized vertically and horizontally, so they do not interfere with each other. It is the first to discover polarization division multiplexing in THz waveguides. In other words, it allows you to transmit two channels of information on one transmission path. Most importantly, by combining Bragg grids with engraving, you can manipulate them yourself.
“Our device is the first THz waveguide architecture with a new metal design that supports polarization division multiplexing. In particular, the ability to implement such sophisticated signal processing functionality, i.e. independent manipulation of THz multiplexed signals, has never been achieved before. , – concludes Professor Marandoti.
This universal approach to the implementation of broadband processing of THz signals in combination with the new design of waveguides paves the way for the next generation network. This will create exciting application scenarios, such as multi-channel transmission of uncompressed ultra-high definition video, high-speed data transmission over short distances between devices, and communication between the chip.
Source of history:
Materials provided by Institut National de la Recherche Scientifique – INRS. The original was written by Audrey-Maud Vezina. Note: Content can be edited by style and length.