Abstract
A demonstration of ultraviolet-B (UVB) communication link is implemented utilizing quadrature amplitude modulation (QAM) orthogonal frequency-division multiplexing (OFDM). The demonstration is based on a 294-nm UVB-light-emitting-diode (UVB-LED) with a full-width at half-maximum (FWHM) of 9 nm and light output power of 190 μW, at 7 V, with a special silica gel lens on top of it. A -3-dB bandwidth of 29 MHz was measured and a high-speed near-solar-blind communication link with a data rate of 71 Mbit/s was achieved using 8-QAM-OFDM at perfect alignment. 23.6 Mbit/s using 2-QAM-OFDM when the angle subtended by the pointing directions of the UVB-LED and photodetector (PD) is 12 degrees, thus establishing a diffuse-line-of-sight (LOS) link. The measured bit-error rate (BER) of 2.8 ×10-4 and 2.4 ×10-4, respectively, are well below the forward error correction (FEC) criterion of 3.8 ×10-3. The demonstrated high data-rate OFDM-based UVB communication link paves the way for realizing high-speed non-line-of-sight free-space optical communications.
Highlights
Communication systems based on UV-band have many inherent advantages
We report a high-speed near-solar-blind UV communication system with a data rate up to 71 Mbit/s in LOS link, and 23.6 Mbit/s at a 12 degrees diffuse-LOS link, based on orthogonal frequency-division multiplexing (OFDM) modulation technique
BModulation scheme: pulse position modulation (PPM) stands for pulse-position modulation; frequency-shift keying (FSK) stands for Frequency-shift keying modulation; OOK stands for on-off keying modulation; OFDM stands for Orthogonal frequency-division multiplexing modulation
Summary
Communication systems based on UV-band have many inherent advantages. There are low background solar radiation and low device dark noise for UV-band, especially for the UVC/B band (100-280nm/280-315nm) [1]. The effect of large obstacle for NLOS channel characterization was evaluated in [7] by utilizing a low-pressure mercury lamp and a PMT combined with a solar-blind filter. As for data communication link, a data rate of ~1.2 kbps based on frequency-shift keying (FSK) was achieved using a 254-nm mercury lamp and a PMT with a solar-blind filter [11]. To the best of our knowledge, the record data rate in UV-LED based communication link is 2.4 kbps [28], which is considerably low. We report a high-speed near-solar-blind UV communication system with a data rate up to 71 Mbit/s in LOS link, and 23.6 Mbit/s at a 12 degrees diffuse-LOS link, based on orthogonal frequency-division multiplexing (OFDM) modulation technique. 265-nm mercury-xenon lamp 253-nm mercury-argon lamp 254-nm low pressure mercury 265-nm LED arrays
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