Free-space optical communication link with shape-invariant orbital angular momentum Bessel beams

Nokwazi Mphuthi; Lucas Gailele; Igor Litvin; Angela Dudley; Roelf Botha; Andrew Forbes

doi:10.1364/AO.58.004258

Applied Optics
Vol. 58,
Issue 16,
pp. 4258-4264
(2019)
•https://doi.org/10.1364/AO.58.004258

Free-space optical communication link with shape-invariant orbital angular momentum Bessel beams

Nokwazi Mphuthi, Lucas Gailele, Igor Litvin, Angela Dudley, Roelf Botha, and Andrew Forbes

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Nokwazi Mphuthi, Lucas Gailele, Igor Litvin, Angela Dudley, Roelf Botha, and Andrew Forbes, "Free-space optical communication link with shape-invariant orbital angular momentum Bessel beams," Appl. Opt. 58, 4258-4264 (2019)

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Table of Contents Category
- Fiber Optics, Fiber Sensors, and Optical Communications
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About this Article
History
- Original Manuscript: April 3, 2019
- Revised Manuscript: May 3, 2019
- Manuscript Accepted: May 3, 2019
- Published: May 23, 2019

Abstract

We present an alternative orbital angular momentum (OAM) solution for free-space optical communications in the form of shape-invariant Bessel beams. We use a generalized approach for generating these long-range self-healing beams with a phase-only element encoded on a spatial light modulator and imbue them with OAM. We study the performance of helical OAM beams as well as these long-range Bessel-like OAM beams over a real-world outdoor optical link of 150 m and show comparable performance. In the process, we characterize the link and its impact on modal cross-talk.

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$n = 1$ , $m = 2$	$n = 2$ , $m = 3$	$n = 1$ , $m = 3$
$α_{c} (z) = \frac{r_{1} a}{a z - r_{1}}$	$α_{c} (z) = \frac{r_{1}}{12 a z^{2}} (1 + 10 a z + F (a, z))$	$α_{c} (z) = \frac{r_{1}}{6 a z^{2}} (r_{1} + 4 a z + G (a, w, z))$
$α_{c} (z) = \frac{r_{1} a}{a z - r_{1}}$	$F (a, z) = \sqrt{1 + 20 a z + 4 a^{2} z^{2}}$	$G (a, w, z) = \sqrt{r_{1}^{2} + 8 a r_{1} z + 4 a^{2} z^{2}}$

Parameters	Value
Transmitter aperture diameter	50.8 mm
Receiver aperture diameter	152.4 mm
Wavelength	532 nm
Link range	150 m
Height above ground	9 m
Laser power	17 dBm
Number of lenses	8
Number of mirrors	11
Camera sensitivity	−40 dBm
Receiver focal length	1.5 m
Transmitter power	13.6 dBm

$n = 1$ , $m = 2$	$n = 2$ , $m = 3$	$n = 1$ , $m = 3$
$α_{c} (z) = \frac{r_{1} a}{a z - r_{1}}$	$α_{c} (z) = \frac{r_{1}}{12 a z^{2}} (1 + 10 a z + F (a, z))$	$α_{c} (z) = \frac{r_{1}}{6 a z^{2}} (r_{1} + 4 a z + G (a, w, z))$
$α_{c} (z) = \frac{r_{1} a}{a z - r_{1}}$	$F (a, z) = \sqrt{1 + 20 a z + 4 a^{2} z^{2}}$	$G (a, w, z) = \sqrt{r_{1}^{2} + 8 a r_{1} z + 4 a^{2} z^{2}}$

Parameters	Value
Transmitter aperture diameter	50.8 mm
Receiver aperture diameter	152.4 mm
Wavelength	532 nm
Link range	150 m
Height above ground	9 m
Laser power	17 dBm
Number of lenses	8
Number of mirrors	11
Camera sensitivity	−40 dBm
Receiver focal length	1.5 m
Transmitter power	13.6 dBm

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