不同可见光接收元件对LED调制效率影响研究

Study of Effects on LED Modulation Efficiency Under Different Light Receiving Elements

针对提升可见光通信(visible light communication,VLC)信息传输效率问题,研究了不同光接受元件下发光二极管(light emitting diode,LED)调制效率问题。VLC系统通过光接收元件接收发端的可见光信号,以确保信号的有效传输。在偏压为3.4 V,发射端与接收端之间距离为10 cm的实验条件下,测量并比较了接收端为LED、硅光电池和光电传感器时,白光LED的调制效率。根据实验数据和拟合的结果表明:当硅光电池为光接收元件时,发射端的LED调制效率最高,线性度较好,一次拟合的R 2数值可以达到0.95以上;当光电传感器为光接收元件时,其调制效率为硅光电池调制效率的66.15%∼82.67%;当LED为接收元件时,在调制效率较高的2.2∼5.0 V(峰-峰值)区域内,其调制效率仅仅为硅光电池的34.48%。

Aiming at improving the efficiency of visible light communication(VLC)information transmission,the problem of light emitting diode(LED)modulation efficiency under different light receiving elements is studied.The VLC system receives the visible light signal at the beginning through light receiving elements to ensure effective signal transmission.Under the experimental conditions that the bias voltage is 3.4 V and the distance between the transmitting and the receiving end is 10 cm,the modulation efficiency of the LED detector,silicon photocell and photoelectric sensor to the white light LED is measured and compared.According to the experimental data and fitting,when the silicon photocell is used as the light receiving element,the LED at the transmitting end has the highest modulation efficiency and good linearity.The R 2 value of a single fitting can reach more than 0.95.When the photoelectric sensor is used as an optical receiving element,its modulation efficiency is 66.15%∼82.67%of that of silicon photocell.When the LED is used as the receiving element,the modulation efficiency is only 34.48%of that of the silicon photocell in the region of 2.2∼5.0 V with high modulation efficiency.