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Photonics might play a key role in future wireless communication systems thatoperate at THz carrier frequencies. A prime example is the generation of THzdata streams by mixing optical signals in high-speed photodetectors. Over theprevious years, this concept has enabled a series of wireless transmissionexperiments at record-high data rates. Reception of THz signals in theseexperiments, however, still relied on electronic circuits. In this paper, weshow that wireless THz receivers can also greatly benefit from optoelectronicsignal processing techniques, in particular when carrier frequencies beyond 0.1THz and wideband tunability over more than an octave is required. Our approachrelies on a high-speed photoconductor and a photonic local oscillator foroptoelectronic down-conversion of THz data signals to an intermediate frequencyband that is easily accessible by conventional microelectronics. By tuning thefrequency of the photonic local oscillator, we can cover a wide range ofcarrier frequencies between 0.03 THz and 0.34 THz. We demonstrate line rates ofup to 10 Gbit/s on a single channel and up to 30 Gbit/s on multiple channelsover a distance of 58 m. To the best of our knowledge, our experimentsrepresent the first demonstration of a THz transmission link that exploitsoptoelectronic signal processing techniques both at the transmitter and thereceiver.

Wireless THz link with optoelectronic transmitter and receiver