Science Daily November 13, 2020 Researchers in Japan took advantage of the high electro-optic activities, low dielectric constant, low propagation loss and ultra-high glass transition temperature of the developed side-chain electro-optic polymers to fabricate silicon-polymer hybrid modulator. It supports ultra-fast single-lane data rates up to 200 gigabits per second, excellent reliability, and exceptional signal fidelity at extremely high ambient temperatures up to 110 °C even after long-term exposure to high temperatures. It could provide ultra-fast and reliable interconnects for datacenters, 5G/B5G, autonomous driving, and aviation systems, effectively addressing the energy consumption issue for the next-generation optical communication…read more. Open Access TECHNICAL […]
Category Archives: Communications technology
Physicists develop efficient modem for a future quantum internet
Phys.org November 5, 2020 A central research object is the interface between local quantum devices and light quanta that enable the remote transmission of highly sensitive quantum information. Researchers in Germany integrated a thin crystal of erbium-doped yttrium orthosilicate a cryogenic Fabry-Perot resonator leading to 56-fold enhancement of the emission rate with an out-coupling efficiency of 46%. They demonstrated that the emitter properties are not degraded. They observed ensemble-averaged optical coherence up to 0.54 ms, which exceeds the 0.19 ms lifetime of dopants at the cavity field maximum. The approach is also applicable to other solid-state quantum emitters, such as […]
Generating photons for communication in a quantum computing system
Phys.org October 10, 2020 Realizing a fully connected network of quantum processors requires the ability to distribute quantum entanglement. For distant processing nodes, this can be achieved by generating, routing, and capturing spatially entangled itinerant photons. Researchers at MIT and MIT Lincoln Laboratory have demonstrated the deterministic generation of such photons using superconducting transmon qubits that are directly coupled to a waveguide. They generated two-photon N00N states and showed that the state and spatial entanglement of the emitted photons are tunable via the qubit frequencies. Using quadrature amplitude detection, they reconstructed the moments and correlations of the photonic modes and […]
5G wireless may lead to inaccurate weather forecasts
Rutgers University September 24, 2020 The signals from the 5G frequency bands potentially could leak into the band used by weather sensors on satellites that measure the amount of water vapor in the atmosphere and affect weather forecasting and predictions. Researchers at Rutgers University used computer modeling to examine the impact of 5G “leakage” on forecasting the deadly 2008 Super Tuesday Tornado Outbreak in the South and Midwest. Based on modeling, 5G leakage power of -15 to -20 decibel Watts affected the accuracy of forecasting of precipitation (by up to 0.9 millimeters) during the tornado outbreak and temperatures near ground […]
Breakthrough Could Lead to Amplifiers for 6G Signals
IEEE Spectrum September 24, 2020 Researchers at UC Santa Barbara have been developing a device that could be critical to efficiently pushing 6G’s terahertz-frequency signals out of the antennas of future smartphones and other connected devices. They show that N-polar GaN deep recess HEMTs grown on sapphire match the power performance of a device on SiC up to 14 V with 5.1 W/mm of output power density. At 16 V the device on sapphire starts to suffer from thermal effects but still demonstrated 5.5 W/mm with an associated 20.6% power-added efficiency. This work also examines the impact of encapsulating the […]
Inflatable Antennas for High Data Rate Satellite and 5G Communications
Next Big Future September 22, 2020 The inflatable antenna system enables big data from cubesats and small low-cost spacecraft. The 3-dimensional phased array antenna technology can provide high data rate communication at virtually any frequency at a fraction of the size and cost of any existing solution. They have a 5G communication antenna which is superior for communication in a city. The 5G antenna can replace 3-4 traditional antennas. The antenna has a fully electronic beam steering, 360-degree coverage eliminates moving parts to dramatically reduce cost and complexity. It is small, lightweight, reliable, provides low-cost access to large volumes of […]
Space communication: developing a one photon-per-bit receiver using near-noiseless phase-sensitive amplification
Phys.org September 17, 2020 Phase-sensitive optical amplifiers (PSAs) with their uniquely low noise figure of 0 dB promise to provide the best possible sensitivity for Gb/s-rate long-haul free-space links. An international team of researchers (Sweden, USA – MIT, UC San Diego, industry, Japan) demonstrate a novel approach using a PSA-based receiver in a free-space transmission experiment with an unprecedented bit-error-free, black-box sensitivity of 1 photon-per-information-bit (PPB) at an information rate of 10.5 Gb/s. The system adopts a simple modulation format (quadrature-phase-shift keying, QPSK), standard digital signal processing for signal recovery and forward-error correction and is straightforwardly scalable to higher data rates…read more. […]
Terahertz receiver for 6G wireless communications
Phys.org September 8, 2020 Future 6G wireless networks will consist of a multitude of small radio cells that need to be connected by broadband communication links. An international team of researchers (Germany, USA – industry) has developed a novel concept for low-cost terahertz receivers that consist of a Schottky barrier diode that offers large bandwidth and that is used as an envelope detector to recover the amplitude of the terahertz signal. To overcome the problem of losing the time-dependent phase of the terahertz wave that is usually lost during rectification, they use digital signal processing techniques in combination with a […]
Revolutionary quantum breakthrough paves way for safer online communication
Phys.org September 2, 2020 An international team of researchers (UK, Austria, Croatia) used multiplexing which splits the light particles, emitted by a single system, so they can be received by multiple users efficiently. They designed a network for eight users using just eight receiver boxes As the user numbers grow, the logistics become increasingly unviable—for instance 100 users would take 9,900 receiver boxes. To demonstrate its functionality across distance the receiver boxes were connected to optical fibres via different locations across Bristol. The ability to transmit messages via quantum communication was tested using the city’s existing optical fibre network. The […]
Beating noise via superposition of order
Phys.org August 25, 2020 Classically no information can be transmitted through a completely noisy channel. But with quantum mechanics, adding a second channel actually provides a way to successfully get the information through. Researchers in Australia have shown that by combining the noisy channels such that you don’t know which noisy channel was applied first, it becomes possible to transmit some information. They considered two limiting cases – when both channels are fully depolarising, the ideal limit is communication of 0.049 bits;, when one channel is fully depolarising the ideal limit is communication of 1 bit. Their results offer intriguing […]