Visible light communication(VLC)technology is a new type of wireless communication technology,which employs a light source as the carrier of information to realize illumination and communication simultaneously.This pa...Visible light communication(VLC)technology is a new type of wireless communication technology,which employs a light source as the carrier of information to realize illumination and communication simultaneously.This paper adopts a single In Ga N/Ga N-base multi-quantum well blue micro-light emitting diode(LED)as the light source,designs pre-emphasis circuit,LED driver circuit,impedance matching network,etc.,and builds a high-speed real-time VLC system.It has been verified that the LED achieves a 3 d B modulation bandwidth of 450 MHz or more;and the real-time communication rate reaches over 800 Mbit/s at a distance of 2 m.The communication bit error rate(BER)is as low as 3.02×10^(-12)at a communication rate of 622 Mbit/s.Experimental indicators including 3 d B bandwidth,communication rate,and communication BER are all taken into account.Therefore,this VLC system supports high-quality high-speed real-time communication.展开更多
Aiming at the problem of high requirement for the signal generator in the Brillouin optical time-domain analysis(BOTDA)system,a quarter of the Brillouin frequency shift(BFS)of modulation is proposed to reduce the requ...Aiming at the problem of high requirement for the signal generator in the Brillouin optical time-domain analysis(BOTDA)system,a quarter of the Brillouin frequency shift(BFS)of modulation is proposed to reduce the required bandwidth of the sensing system.A functional model for solving the intensity of each-order sideband of the output light of electro-optic modulator(EOM)is proposed and applied,so the spectrum with suppressed the carrier and the first-order sidebands while maximizing the second-order sidebands is obtained.Compared with the latest scheme,the intensity of the second-order sidebands is increased by 21.1%based on this functional model.In the experiment,the second-order upper sideband and the second-order lower sideband are used as continuous wave(CW)probe light and pump pulse light,respectively,which ultimately reduces the required bandwidth of radio frequency(RF)signal sources to a quarter of the BFS(reduced from~11 GHz to~2.75 GHz),and the frequency sweep range is also reduced to a quarter of the original.展开更多
基金supported by the Science of Technology Program of Guangdong Province(No.2015B010110002)the Science Technology Program of Guangzhou(No.201804010166)
文摘Visible light communication(VLC)technology is a new type of wireless communication technology,which employs a light source as the carrier of information to realize illumination and communication simultaneously.This paper adopts a single In Ga N/Ga N-base multi-quantum well blue micro-light emitting diode(LED)as the light source,designs pre-emphasis circuit,LED driver circuit,impedance matching network,etc.,and builds a high-speed real-time VLC system.It has been verified that the LED achieves a 3 d B modulation bandwidth of 450 MHz or more;and the real-time communication rate reaches over 800 Mbit/s at a distance of 2 m.The communication bit error rate(BER)is as low as 3.02×10^(-12)at a communication rate of 622 Mbit/s.Experimental indicators including 3 d B bandwidth,communication rate,and communication BER are all taken into account.Therefore,this VLC system supports high-quality high-speed real-time communication.
文摘Aiming at the problem of high requirement for the signal generator in the Brillouin optical time-domain analysis(BOTDA)system,a quarter of the Brillouin frequency shift(BFS)of modulation is proposed to reduce the required bandwidth of the sensing system.A functional model for solving the intensity of each-order sideband of the output light of electro-optic modulator(EOM)is proposed and applied,so the spectrum with suppressed the carrier and the first-order sidebands while maximizing the second-order sidebands is obtained.Compared with the latest scheme,the intensity of the second-order sidebands is increased by 21.1%based on this functional model.In the experiment,the second-order upper sideband and the second-order lower sideband are used as continuous wave(CW)probe light and pump pulse light,respectively,which ultimately reduces the required bandwidth of radio frequency(RF)signal sources to a quarter of the BFS(reduced from~11 GHz to~2.75 GHz),and the frequency sweep range is also reduced to a quarter of the original.
