Speaker
Description
With many regions of the electromagnetic spectrum already being allocated for wireless communications in mobile, satellite and military sectors, there is a growing need to exploit new frequency regions. The terahertz (THz) band, which lies between the microwave and infrared regions, serves as a possible solution to achieve high data transfer rates at Terabytes/sec (Tbps). For transmission in atmospheric conditions, water vapour molecules attenuate the THz signal in certain frequency regions, primarily due to rotational resonances. There are a few spectral windows with negligible absorption, with some allowing signal propagation over several meters and others over several hundreds of meters. The short distance propagation windows can be used for secure communications in a small area with limited possibilities of eavesdropping. The latter can be used for transferring data over relatively long distances in turbulent atmospheres. We study the propagation distance of different spectral bands and investigate their potential for one of the above-mentioned applications. Our study relies on a nonlinear optical technique to achieve sensitive detection of THz signals. We demonstrate a parametric up conversion process allowing all information contained within a THz signal to be retrieved with a commercial optical detector sensitive to near-infrared light. Our optical configuration combines a monochromator and a single-photon avalanche diode to achieve spectral resolution up to 3 THz with a <0.2 THz resolution and an unprecedented detection sensitivity. These results pave the way towards the development of 6G wireless communication relying on new spectral bands above 1 THz, enabling higher data transfer rates and increasing the security of local networks.
| Keyword-1 | Wireless communication |
|---|---|
| Keyword-2 | 6G |
| Keyword-3 | parametric up conversion |
