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Proceedings Paper

Study of the modulating efficiency of white LED with different rated powers
Author(s): Lin Gui; Su-zhen Song; Yu-xuan Zhu; Honglin Shen; Xueyi Cai; Zixin Zhu
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Paper Abstract

For a VLC system, it transmits information by modulating LED with electrical signal. To ensure the sufficient optical power at the receiver, the electrical signal with large amplitude is hope to be applied on the LED , however, the LED has the turn-on voltage and the saturated voltage, so large electrical signal in transmitter will lead to the clipping distortion on the LED in theory. In this paper, the modulating efficiencies of white light LED with the rated power 1W, 0.5W and 0.1W are measured in experiment with the biased voltage 3.4V, and their modulating property are compared when the peak-peak AC voltage of the frequency 500KHz are in the range 0.5V-2.1Vpp and 2.2-5Vpp. In the experiment, an Arbitrary waveform generator (AWG) with the voltage bias function is utilized to generate a biased sine waveform Experimental results show that the slopes of Pe-Vt curve(modulating efficiency) increase with the drop of the rated power of LED at the frequency 500KHz in region I. In region II, the slopes of 1W LED and 0.1W LED are larger than that of 0.5W LED. The modulating efficiency is higher in region II than that in region I. When LED operate at the clipping distortion region, it has large modulating efficiency. Data fitting analysis shows that the 1W LED has the poor linearity in both region because its R-squares in both regions are smaller than other LEDs. The nonlinearity of the Pe-Vt curve will affect the modulating efficiency.

Paper Details

Date Published: 20 December 2019
PDF: 4 pages
Proc. SPIE 11209, Eleventh International Conference on Information Optics and Photonics (CIOP 2019), 112092Q (20 December 2019); doi: 10.1117/12.2548544
Show Author Affiliations
Lin Gui, Shanghai Second Polytechnic Univ. (China)
Su-zhen Song, Shanghai Second Polytechnic Univ. (China)
Yu-xuan Zhu, Shanghai Second Polytechnic Univ. (China)
Honglin Shen, Shanghai Second Polytechnic Univ. (China)
Xueyi Cai, Shanghai Second Polytechnic Univ. (China)
Zixin Zhu, Shanghai Second Polytechnic Univ. (China)

Published in SPIE Proceedings Vol. 11209:
Eleventh International Conference on Information Optics and Photonics (CIOP 2019)
Hannan Wang, Editor(s)

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