Underwater wireless transmission of high-speed QAM-OFDM signals using a compact red-light laser
2016; Optica Publishing Group; Volume: 24; Issue: 8 Linguagem: Inglês
10.1364/oe.24.008097
ISSN1094-4087
AutoresJing Xu, Yuhang Song, Xiangyu Yu, Aobo Lin, Meiwei Kong, Jun Han, Ning Deng,
Tópico(s)Water Quality Monitoring Technologies
ResumoWe first study the transmission property of red light in water in terms of extinction coefficient and channel bandwidth via Monte Carlo simulation, with an interesting finding that red light outperforms blue-green light in highly turbid water. We further propose and experimentally demonstrate a broadband underwater wireless optical communication system based on a simple and cost-effective TO56 red-light laser diode. We demonstrate a 1.324-Gb/s transmission at a bit error rate (BER) of 2.02 × 10-3 over a 6-m underwater channel, by using 128-QAM OFDM signals and a low-cost 150-MHz positive-intrinsic-negative photodetector, with a record spectral efficiency higher than 7.32 bits/Hz. By using an avalanche photodetector and 32-QAM OFDM signals, we have achieved a record bit rate of 4.883 Gb/s at a BER of 3.20 × 10-3 over a 6-m underwater channel.
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