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Optical filter-less wdm for visible light communications using defocused mimo

Lookup NU author(s): Dr Paul HaighORCiD



This work is licensed under a Creative Commons Attribution 4.0 International License (CC BY 4.0).


© 2021 by the authors. Licensee MDPI, Basel, Switzerland.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.

Publication metadata

Author(s): Burton A, Chvojka P, Haigh PA, Ghassemlooy Z, Zvanovec S

Publication type: Article

Publication status: Published

Journal: Electronics

Year: 2021

Volume: 10

Issue: 9

Online publication date: 30/04/2021

Acceptance date: 29/04/2021

Date deposited: 17/05/2021

ISSN (electronic): 2079-9292

Publisher: MDPI AG


DOI: 10.3390/electronics10091065


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