KAUST Team Reports Record-breaking UV LED Comms
LED-based communication system achieves line-of-sight data rates up to 71 Mbit/s using 8-QAM-OFDM technique
For free-space optical wireless communications, UV-light-based systems have many inherent advantages such as low background solar radiation and low device dark noise especially for the UV-C/B (100-280nm/280nm-315nm) band.
In addition, atmospheric scattering of UV radiation contributes to less restrictive requirements for pointing, acquisition, and tracking (PAT), making the technology suitable for diffuse line-of-sight (LOS) as well as non-line-of-sight (NLOS) communications.
Now researchers from King Abdullah University of Science and Technology (KAUST), led by Boon S. Ooi, have reported a record-breaking high-speed near-solar-blind UV communication system with a data rate up to 71 Mbit/s in a LOS link, and 23.6 Mbit/s at a 12-degree diffuse-LOS link.
They have achieved this high data rate by using orthogonal frequency-division multiplexing (OFDM) modulation technique and a 294-nm UVB-LED.
The figure below shows the testbed for the LED based UV communication measurement, comprising an Agilent 81150A Arbitrary Waveform Generator (AWG), a Tektronix DPO70404C Digital Phosphor Oscilloscope (DPO), a UVB-LED, Thorlabs LA4052-UV plano convex lens, as well as a Thorlabs APD 430A2/M avalanche photodetector.
The measured bit-error rate (BER) are 2.8 and 2.4 for LOS link and diffuse-LOS link, respectively, which are well below the forward error correction (FEC) criterion (3.8). The demonstration of an 8-QAMs OFDM near-solar-blind UV communication system with the highest data rate ever reported paves the way towards further development of UV NLOS communication link.
'71-Mbit/s ultraviolet-B LED communication link based on 8-QAM-OFDM modulation', by Xiaobin Sun et al; Optics Express, Vol. 25, No. 19, 18 Sep 2017.
AngelTech Live III: Join us on 12 April 2021!
AngelTech Live III will be broadcast on 12 April 2021, 10am BST, rebroadcast on 14 April (10am CTT) and 16 April (10am PST) and will feature online versions of the market-leading physical events: CS International and PIC International PLUS a brand new Silicon Semiconductor International Track!
Thanks to the great diversity of the semiconductor industry, we are always chasing new markets and developing a range of exciting technologies.
2021 is no different. Over the last few months interest in deep-UV LEDs has rocketed, due to its capability to disinfect and sanitise areas and combat Covid-19. We shall consider a roadmap for this device, along with technologies for boosting its output.
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