Terahertz Communication

Terahertz communication – wireless data transfer at frequencies beyond 100 GHz.
Terahertz communication – wireless data transfer at frequencies beyond 100 GHz.
  • High-bandwidth communication via higher carrier frequencies
  • Data links > 120 GHz have been demonstrated
  • Possible scenarios: High-res movie download, satellite communication
  • Ongoing research on terahertz fiber cables / transmission lines

The communications sector represents another terahertz market with significant potential. Wireless communication systems continue to strive for higher bandwidths – and faster data transfer requires higher carrier frequencies. Present-day systems like Bluetooth or WLANs employ bandwidths between a few MHz and several GHz. However, judging from the ever-increasing growth in data rates, it is obvious that these frequency bands will not suffice in the long run, when transfer rates of several 10 Gigabits/second will be needed [1].
 

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Admittedly, technical challenges have to be met - there are, for instance, no suitable transmission lines, i.e. no terahertz equivalents to fiber-optics - but free-space communication channels (inter-satellite communication, or "hot spots" for wireless download of high-data videos) at frequencies of 100 GHz and above can certainly be envisaged.

During the 2008 Olympic Games in Beijing, scientists from Osaka University and NTT Corp. already demonstrated a 120 GHz data link to transmit uncompressed high-definition images of the game stadiums from the International Broadcasting Center to the Beijing Media Center, across a distance of 1 km [2].

For researchers in the field of terahertz communication, TOPTICA’s cw packages offer a perfect testbed, as the terahertz frequency can be set to any value between 50 and 1800 GHz. In particular, InP-based terahertz emitters unite a high frequency selectivity and record power levels on the µW scale.

References:
[1] Terahertz Communication Lab, Technical University of Braunschweig
[2] Y. Kado and T. Nagatsuma, PIERS Proceedings, Beijing, 42 (2009)
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Related Literature

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Brochures: Take a Look Inside: Terahertz Technologies
toptica_BR_terahertz_2012.pdf
Scientific Paper: Terahertz-time domain spectrometer with 90 dB peak dynamic range, Vieweg et al, J Infrared Milli Terahz Waves, 2014
toptica_vieweg_J_Infrared_Milli_Terahz_Waves_2014.pdf
Scientific Paper: Precisely tunable continuous-wave terahertz source with interferometric frequency control
toptica_ScPaper_Sci_Instr_2008.pdf
Scientific Paper: Coherent broadband continuous-wave terahertz spectroscopy on solid-state samples
toptica_ScPaper_New_J_Phys_2010.pdf
Scientific Paper: Using a fiber stretcher as a fast phase modulator in a continuous wave terahertz spectrometer
Roggenbuck_JOSA_B_2012.pdf
Scientific Paper: Compact cw Terahertz Spectrometer Pumped at 1.5 µm Wavelength
toptica_ScPaper_J_Infr_THz_Waves_2010.pdf
Overview article: Laser-based terahertz generation & applications
toptica_lang_deninger_photonik_2012.pdf

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