http://www.acsu.buffalo.edu/~jmjornet/papers/2014/j1.pdf

Full length article: Terahertz band: Next frontier for wireless communications

Science and technologies based on terahertz frequency electromagnetic radiation (100 GHz–30 THz) have developed rapidly over the last 30 years. For most of the 20th Century, terahertz radiation, then referred to as sub-millimeter wave or far-infrared radiation, was mainly utilized by astronomers and some spectroscopists. Following the development of laser based terahertz time-domain spectroscopy in the 1980s and 1990s the field of THz science and technology expanded rapidly, to the extent that it now touches many areas from fundamental science to 'real world' applications. For example THz radiation is being used to optimize materials for new solar cells, and may also be a key technology for the next generation of airport security scanners. While the field was emerging it was possible to keep track of all new developments, however now the field has grown so much that it is increasingly difficult to follow the diverse range of new discoveries and applications that are appearing. At this point in time, when the field of THz science and technology is moving from an emerging to a more established and interdisciplinary field, it is apt to present a roadmap to help identify the breadth and future directions of the field. The aim of this roadmap is to present a snapshot of the present state of THz science and technology in 2017, and provide an opinion on the challenges and opportunities that the future holds. To be able to achieve this aim, we have invited a group of international experts to write 18 sections that cover most of the key areas of THz science and technology. We hope that The 2017 Roadmap on THz science and technology will prove to be a useful resource by providing a wide ranging introduction to the capabilities of THz radiation for those outside or just entering the field as well as providing perspective and breadth for those who are well established. We also feel that this review should serve as a useful guide for government and funding agencies.

https://iopscience.iop.org/article/10.1088/1361-6463/50/4/043001/pdf

The 2017 terahertz science and technology roadmap

A wireless communication system with a maximum data rate of 100 Gbit s−1 over 20 m is demonstrated using a carrier frequency of 237.5 GHz. The photonic schemes used to generate the signal carrier and local oscillator are described, as is the fast photodetector used as a mixer for data extraction.

Wireless sub-THz communication system with high data rate

The 2016 terahertz science and technology roadmap

There has been an increasing interest in the application of terahertz (THz) waves to broadband wireless communications. In particular, use of frequencies above 275 GHz is one of the strong concerns among radio scientists and engineers, because these frequency bands have not yet been allocated at specific active services, and there is a possibility to employ extremely large bandwidths for ultra-broadband wireless communications. Introduction of photonics technologies for signal generation, modulation and detection is effective not only to enhance the bandwidth and/or the data rate, but also to combine fiber-optic (wired) and wireless networks. This paper reviews recent progress in THz wireless communications using telecom-based photonics technologies towards 100 Gbit/s.

http://foresight.ifmo.ru/ict/shared/files/201311/1_144.pdf

Terahertz wireless communications based on photonics technologies

A wireless data link operating at a carrier frequency of 220 GHz is supporting a data rate of up to 25 Gbit/s in on-off-keyed PRBS as well as complex 256-QAM (quadrature amplitude modulation) transmission. The millimeter-wave transmit and receive frontends consist of active multi-functional millimeter-wave microwave integrated circuits (MMICs), realized in 50 nm mHEMT technology and packaged into split-block waveguide modules. The paper presents system considerations for wireless links in the 200-300-GHz range, discusses the design and performance of dedicated broadband transmit and receive MMICs, and presents link experiments. With an RF transmit power of -3.4-1.4 dBm in the IF frequency range from 0 to 20 GHz , a receiver conversion gain of better than -4.8 dB up to 270 GHz and an estimated noise figure of less than 7.5 dB at 220 GHz, a 231-1 PRBS with a data rate of up to 25 Gbit/s is transmitted over 50 cm and received with an eye diagram quality factor >;3 . At 10 Gbit/s, an uncorrected bit-error rate (BER) of 1.6·10-9 is measured over a distance of 2 m. A 256-QAM signal with approx. 14 Mbit/s is received with an uncorrected BER of 9.1·10-4.

All Active MMIC-Based Wireless Communication at 220 GHz

Based on active millimeter-wave monolithic integrated circuits (MMICs), a pair of receiver and transmitter modules have been developed and used for wireless data transmission experiments at 240 GHz with data rates of up to 40 Gbit/s Both modules are driven with a subharmonic local oscillator, located at 120 GHz and feature broadband quadrature I/Q IF terminals The receiver module has a maximum conversion gain of 38 dB at 240 GHz The I/Q imbalance stays below 19 dB in the frequency range from 200 to 280 GHz The transmitter achieves a maximum output power of -36 dBm

A 240 GHz quadrature receiver and transmitter for data transmission up to 40 Gbit/s

A system concept for a high data rate wireless link in the frequency range from 200 to 280 GHz is presented. The link is based on fully integrated millimeter wave circuits (MMICs) and promises data rates up to 40Gbit/s over a distance of one kilometer. A demonstrator working at a carrier frequency of 220 GHz serves as a proof-of-concept. Measurements with this demonstrator show data rates up to 25 Gbit/s for a coherent receiving scheme over a distance of 60 cm as well as a bit error rate of 5 × 10−4 at 25Gbit/s.

System concept and implementation of a mmW wireless link providing data rates up to 25 Gbit/s

In this paper, we present the wireless data transmission of incoherent non-return to zero on-off keying (NRZ-OOK) signals with a data rate of 10 Gbit/s at a carrier frequency of 240 GHz. The transmitter (Tx) and receiver (Rx) are separated by a distance of 10 m. For a realistic, incoherent scenario, two independent, unsychronized local oscillators (LOs) are used at the transmitter and receiver side. To recover the baseband signal, the radio frequency (RF) is down-converted to a near zero intermediate frequency (IF) of 200 kHz. A complex power detection is performed on the in-phase (I) and quadrature (Q) channels to obtain the amplitude information of the transmit signal and hence to recover the sent data.

Multi-gigabit data transmission at 240 GHz with complex baseband power detection

Im Rahmen eines universitätsübergreifenden Projekts soll eine universell einsetzbare Fertigungsstraße konzipiert werden [1]. Diese gestaltet die gesamte Produktion mithilfe von baugleichen Maschinen mit einer roboterähnlichen Kinematik. Ein Teilprozess dieser Fertigungsstraße ist die Herstellung eines Batteriegehäuses. Hierbei wird unter anderem ein Aluminiumwerkstück zerspanend bearbeitet. Die Zerspanung läuft mittels Fräsen und unter der Zuhilfenahme eines oder mehrerer gekoppelter Industrieroboter ab.

F. Kurz

Papers

All Active MMIC-Based Wireless Communication at 220 GHz

A 240 GHz quadrature receiver and transmitter for data transmission up to 40 Gbit/s

System concept and implementation of a mmW wireless link providing data rates up to 25 Gbit/s

Multi-gigabit data transmission at 240 GHz with complex baseband power detection

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