TY - JOUR
T1 - Optical Filter-Less WDM for Visible Light Communications Using Defocused MIMO
AU - Burton, Andrew
AU - Chvojka, Petr
AU - Haigh, Paul Anthony
AU - Ghassemlooy, Zabih
AU - Zvánovec, Stanislav
N1 - Funding Information:
Funding: This project is supported by the UK EPSRC grant EP/P006280/1: MARVEL and the EU Cost Action NEWFOCUS CA19111 and CTU project SGS20/166/OHK3/3T/13.
Publisher Copyright:
© 2021 by the authors. Licensee MDPI, Basel, Switzerland.
Copyright:
Copyright 2021 Elsevier B.V., All rights reserved.
PY - 2021/5/1
Y1 - 2021/5/1
N2 - This paper experimentally investigates, for the first time, a new wavelength-division multiplexing-based visible light communications link based on a defocused non-imaging multiple-input multiple-output (MIMO), which removes the need for tuned optical bandpass filters paired with each receiver. The proposed system is based on using the natural diversity of the individual light emitting diodes (LEDs) within a single light source to generate an H-matrix, which is independent of spatial diversity. We show that, by transmitting K-independent sets of non-return to zero on-and-off keying signals on separate wavelengths, the received superposed symbols can be demultiplexed. The non-imaging MIMO diversity is achieved by considering the power-current characteristics of the light emitting diode, the responsivity of the photodetector array, and the defocused beam spot. The system is empirically verified for K = 3 using red, green, and blue LEDs with Q-factors of 7.66, 7.69, and 4.75 dB, respectively.
AB - This paper experimentally investigates, for the first time, a new wavelength-division multiplexing-based visible light communications link based on a defocused non-imaging multiple-input multiple-output (MIMO), which removes the need for tuned optical bandpass filters paired with each receiver. The proposed system is based on using the natural diversity of the individual light emitting diodes (LEDs) within a single light source to generate an H-matrix, which is independent of spatial diversity. We show that, by transmitting K-independent sets of non-return to zero on-and-off keying signals on separate wavelengths, the received superposed symbols can be demultiplexed. The non-imaging MIMO diversity is achieved by considering the power-current characteristics of the light emitting diode, the responsivity of the photodetector array, and the defocused beam spot. The system is empirically verified for K = 3 using red, green, and blue LEDs with Q-factors of 7.66, 7.69, and 4.75 dB, respectively.
KW - visible light communications
KW - MIMO
KW - WDM
UR - https://www.scopus.com/pages/publications/85105012155
U2 - 10.3390/electronics10091065
DO - 10.3390/electronics10091065
M3 - Article
SN - 2079-9292
VL - 10
JO - Electronics
JF - Electronics
IS - 9
M1 - e1065
ER -