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. 2017 Sep 28;8:729. doi: 10.1038/s41467-017-00877-x

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© The Author(s) 2017

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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Fig. 3 — Schematic diagram and multiplexing/demultiplexing of two THz channels. a Schematic showing the measurement setup, with two different transmitters at 264.7 GHz and 332.5 GHz at fixed angular positions, and with the receiver mounted on a pivoting rail to vary the measurement angle. Power pattern and BER performance for both real-time links at 264.7 GHz and 332.5 GHz are measured after mux-demux with data rate at 1.5 Gb/s. b View of the mux-demux in the experimental setup. c Power pattern measured when channel 1 (264.7 GHz) is on while channel 2 (322.5 GHz) is off (red curve), channel 2 is on, whereas channel 1 is off (blue curve), and both channels are on (black curve). d BER performance for channel 1 only (red), channel 2 only (blue), channel 1 when channel 2 is on (light green) and channel 2 when channel 1 is on (dark green). Error-free operation can be achieved in both channels even with both signals on. (e, f) Two real-time videos (HD-TV broadcast) transmitted by the two THz links at 264 GHz and 332.5 GHz, each with a data rate of 1.5 Gb/s. The video signals are taken from two different TV broadcast channels and connected to the transmitters. In the monitor connected to the detector, the channel switches when the angular position of the receiver changes. This THz mux/demux can be observed in operation in the Supplementary Movie, showing excellent stability and reproducibility