Visible light communications: increasing data rates with polarization division multiplexing

Petr Chvojka; Andrew Burton; Petr Pesek; Xicong Li; Zabih Ghassemlooy; Stanislav Zvanovec; Paul Anthony Haigh

doi:10.1364/OL.392167

Optics Letters
Vol. 45,
Issue 11,
pp. 2977-2980
(2020)
•https://doi.org/10.1364/OL.392167

Visible light communications: increasing data rates with polarization division multiplexing

Petr Chvojka, Andrew Burton, Petr Pesek, Xicong Li, Zabih Ghassemlooy, Stanislav Zvanovec, and Paul Anthony Haigh

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Petr Chvojka, Andrew Burton, Petr Pesek, Xicong Li, Zabih Ghassemlooy, Stanislav Zvanovec, and Paul Anthony Haigh, "Visible light communications: increasing data rates with polarization division multiplexing," Opt. Lett. 45, 2977-2980 (2020)

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- Fiber Optics and Optical Communications
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About this Article
History
- Original Manuscript: March 9, 2020
- Revised Manuscript: April 17, 2020
- Manuscript Accepted: April 21, 2020
- Published: May 21, 2020

Abstract

In this Letter, we propose a new configuration for visible light communication systems, which results in doubling of the data rate due to the use of polarization division multiplexing. As light-emitting diodes are unpolarized incoherent light sources, we isolate both the perpendicular $s$ and parallel $p$ modes for independent modulation. For the first time, to the best of our knowledge, we show that it is possible to transmit and successfully recover two separate orthogonal frequency division multiplexing (OFDM) signals on each polarization (pol-OFDM). Furthermore, we compare the performance of the pol-OFDM system with the transmission of a single conventional OFDM signal without a polarizer over the same physical link. We show that similar bit error rates can be achieved while obtaining ${\sim}45\%$ improvement in both the data rate and spectral efficiency due to polarization multiplexing.

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Parameter	Value
Number of subcarriers, $N$	1024
Signal bandwidth, $B$	500 MHz
Sampling frequency of the AWG, $f_{s}$	5 GS/s
Focal length of the aspheric lens, $f_{L}$	16 mm
Bias current of the LED, $I_{b}$	90 mA
Wavelength of the LED, $λ_{r}$	630 nm
Link distance	1.6 m
Bandwidth of the photodetector	1 GHz
Sampling frequency of the oscilloscope, $f_{o}$	20 GS/s

Polarization	None	$p$	$s$
$R_{b} (Gb/s)$	2.50	1.85	1.78
		$\sum 3.63$
$η_{s e}$ (b/s/Hz)	5	7.26
BER	$2.9 \cdot 10^{- 3}$	$3 \cdot 10^{- 3}$	$3.8 \cdot 10^{- 3}$
$P_{r}$ (mW)	1.35	0.51	0.41

Parameter	Value
Number of subcarriers, $N$	1024
Signal bandwidth, $B$	500 MHz
Sampling frequency of the AWG, $f_{s}$	5 GS/s
Focal length of the aspheric lens, $f_{L}$	16 mm
Bias current of the LED, $I_{b}$	90 mA
Wavelength of the LED, $λ_{r}$	630 nm
Link distance	1.6 m
Bandwidth of the photodetector	1 GHz
Sampling frequency of the oscilloscope, $f_{o}$	20 GS/s

Polarization	None	$p$	$s$
$R_{b} (Gb/s)$	2.50	1.85	1.78
		$\sum 3.63$
$η_{s e}$ (b/s/Hz)	5	7.26
BER	$2.9 \cdot 10^{- 3}$	$3 \cdot 10^{- 3}$	$3.8 \cdot 10^{- 3}$
$P_{r}$ (mW)	1.35	0.51	0.41

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Optics Letters