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Wireless communications on THz carriers takes shape

: Freude, W.; König, S.; Lopez-Diaz, D.; Antes, J.; Boes, F.; Henneberger, R.; Leuther, A.; Tessmann, A.; Schmogrow, R.; Hillerkuss, D.; Palmer, R.; Zwick, T.; Koos, C.; Ambacher, O.; Leuthold, J.; Kallfass, I.


Institute of Electrical and Electronics Engineers -IEEE-; IEEE Photonics Society:
16th International Conference on Transparent Optical Networks, ICTON 2014 : Graz, Austria, 6 July 2014 - 10 July 2014
Piscataway, NJ: IEEE, 2014
ISBN: 978-1-4799-5600-5
ISBN: 978-1-4799-5601-2
ISBN: 978-1-4799-5602-9
International Conference on Transparent Optical Networks (ICTON) <16, 2014, Graz>
Fraunhofer IAF ()
Terahertz radiation; microwave photonics; high-speed wireless transmission; photomixing; electro-optical gateway; photonic network

High carrier frequencies in the terahertz range 0.1...30 THz are required for wireless data transmission at line rates at or beyond 100 Gbit/s. Here we demonstrate a system with one to three carriers near 237GHz for (75...100) Gbit/s single-polarization transmission over distances of (20...40) m. The narrow-band THz carrier is generated by photomixing of highly stable mode-locked laser lines in a uni-travelling-carrier photodiode. The electrical photodiode output is radiated over a lensed horn antenna. Besides a receiving lensed horn antenna, the receiver comprises monolithic integrated circuits with mixers and amplifiers. This synergetic use of THz photon-ics and electronics ("teratronics") should be scalable to wireless Tbit/s transmission over 1 km. Such a wireless link could bridge the last mile to a subscriber, or could connect two spatially separated fibre gateways.