750 Mb/s monochromatic LED-based real-time visible light communication system employing a low-complexity cascaded post-equalizer

Jiabin Luo; Yi Tang; Huiping Jia; Qingwei Zhu; 唯 薛

doi:10.3788/COL201614.120604

Journals >Chinese Optics Letters >Volume 14 >Issue 12 >Page 120604 > Article

Chinese Optics Letters
Vol. 14, Issue 12, 120604 (2016)

750 Mb/s monochromatic LED-based real-time visible light communication system employing a low-complexity cascaded post-equalizer

Jiabin Luo^1、2, Yi Tang^1、2、*, Huiping Jia³, Qingwei Zhu^1、2, and 唯薛^1、2

Author Affiliations

¹Key Laboratory of Photoelectronic Imaging Technology and System, Ministry of Education of China, Beijing 100081, China

²School of Optoelectronics, Beijing Institute of Technology, Beijing 100081, China

³Department of Materials Science and Engineering, Erik Jonsson School of Engineering and Computer Science, University of Texas at Dallas, Richardson, Texas 75083, USA

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DOI: 10.3788/COL201614.120604 Cite this Article Set citation alerts

Jiabin Luo, Yi Tang, Huiping Jia, Qingwei Zhu, 唯薛. 750 Mb/s monochromatic LED-based real-time visible light communication system employing a low-complexity cascaded post-equalizer[J]. Chinese Optics Letters, 2016, 14(12): 120604 Copy Citation Text

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Frequency response of four commercially available monochromatic LEDs. R-LED: red LED (LXM2-PD01-0050); G-LED: green LED (LXML-PM01-0100); B-LED: blue LED (LXML-PB02); Y-LED: yellow LED (LXML-PL01-0060).

Fig. 1. Frequency response of four commercially available monochromatic LEDs. R-LED: red LED (LXM2-PD01-0050); G-LED: green LED (LXML-PM01-0100); B-LED: blue LED (LXML-PB02); Y-LED: yellow LED (LXML-PL01-0060).

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Fig. 2. Proposed two-cascaded NPN transistors-based post-equalizer with different frequency-selecting networks.

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Fig. 3. (a) The block diagram of our VLC system and (b) the VLC experimental link.

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Fig. 4. Frequency responses of post-equalizers and monochromatic LED-based VLC link with and without post-equalizers: (a) R-LED, (b) G-LED, (c) B-LED, and (d) Y-LED.

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Fig. 5. BER versus data rate of monochromatic LED-based VLC links with post-equalizer.

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Fig. 6. Eye diagrams of monochromatic LED-based VLC system with proposed post-equalizer at different data rates with a BER below 1×10−6: (a) R-LED at 750 Mb/s, (b) G-LED at 690 Mb/s, (c) B-LED at 730 Mb/s, and (d) Y-LED at 650 Mb/s.

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LED	R-LED	G-LED	B-LED	Y-LED
$R_{1}$ , $R_{6}$	150 Ω	150 Ω	150 Ω	150 Ω
$R_{2}$ , $R_{7}$	75 Ω	75 Ω	75 Ω	75 Ω
$R_{3}$ , $R_{8}$	100 Ω	83 Ω	83 Ω	100 Ω
$R_{4}$ , $R_{9}$	100 Ω	83 Ω	83 Ω	100 Ω
$R_{5}$	10 Ω	11 Ω	7 Ω	11 Ω
$C_{1}$	5 pF	12 pF	15 pF	9 pF
$C_{3}$	100 pF	100 pF	100 pF	100 pF
VCC	7.8 V	7.8 V	7.8 V	7.8 V

Table 1. Proper Parameters in Post-Equalizers for LEDs

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System length/mm	61
System diameter/mm	35
Focal length of first lens/mm	63
Focal length of second lens/mm	12.5
Field of view/deg.	10
Relative illumination	50
Optical gain	80
Wavelength range/μm	0.44–0.63