Super-fast wifi 100 times faster than today is on the horizon using high-frequency radiation waves. US researchers have for the first time been able to send video signals using terahertz, rather than traditional microwaves. Terahertz waves, which are high-frequency radiation, allow data to travel at 50 gigabits a second. That offers streaming speeds about 100 times faster than those possible today, in which wireless networks reach a top speed of 500 megabytes. Professor Daniel Mittleman, from Brown University in the US, said: 'We showed that we can transmit separate data streams on terahertz waves at very high speeds and with very low error rates.
Never mind the possibilities opened up by millimeter wave 5G and other many-gigahertz technologies -- the FCC is already thinking about the next generation beyond that. The Commission has voted unanimously in favor of creating a category of experimental licenses that range from 95GHz to a whopping 3THz -- effectively, the limits of usable wireless technology. The Spectrum Horizons order would let companies experiment with this ultra-high frequency tech for as long as 10 years, and would make it easier for them to sell real-world products while they're in that test phase. The measure also sets aside 21.2GHz of spectrum to share for unlicensed devices. The airwaves in question were chosen to minimize possible interference with current "governmental and scientific" uses in those areas, such as space science.
Researchers at the Harvard School of Engineering and Applied Sciences have developed a method to wirelessly transmit radio frequency via a semiconductor laser. The breakthrough, published in Proceedings of the National Academy of Sciences, is a marked advancement on conventional lasers, which can only emit a single frequency of light. The researcher's development can use lasers to emit microwaves, modulate them and receive external radio frequency signals, which opens up the possibility for "ultra-high-speed WiFi." The development builds upon previous advances made by the lab, which found it was possible to use an infrared frequency comb in lasers to generate terahertz wavelengths capable of moving data -- and do it at speeds hundreds of times faster than today's wireless internet services. The latest findings make it possible to extract and transmit wireless signals from the frequency comb, which was made possible by creating a rabbit ears-style antenna that could receive and decipher the information being transmitted by the laser.
Sub-terahertz wavelengths, which are between microwave and infrared radiation on the electromagnetic spectrum, can be detected through fog and dust clouds with ease, whereas the infrared-based LiDAR imaging systems used in autonomous vehicles struggle. To detect objects, a sub-terahertz imaging system sends an initial signal through a transmitter; a receiver then measures the absorption and reflection of the rebounding sub-terahertz wavelengths. That sends a signal to a processor that recreates an image of the object. But implementing sub-terahertz sensors into driverless cars is challenging. Sensitive, accurate object-recognition requires a strong output baseband signal from receiver to processor.
The future depends on connectivity. From artificial intelligence and self-driving cars to telemedicine and mixed reality to as yet undreamt technologies, all the things we hope will make our lives easier, safer, and healthier will require high-speed, always-on internet connections. The FCC regulates who can use which ranges, or bands, of frequencies to prevent users from interfering with each other's signals. Low-Band Frequencies Bands below 1 GHz traditionally used by broadcast radio and television as well as mobile networks; they easily cover large distances and travel through walls, but those are now so crowded that carriers are turning to the higher range of the spectrum. Mid-Band Spectrum The range of the wireless spectrum from 1 GHz to 6 GHz, used by Bluetooth, Wi-Fi, mobile networks, and many other applications.