Generation of highly pure lower-order Laguerre–Gaussian radial beams using an all-fiber multimode interference method

Nitin Bhatia

doi:10.1364/JOSAB.409000

Journal of the Optical Society of America B
Vol. 38,
Issue 4,
pp. 1069-1077
(2021)
•https://doi.org/10.1364/JOSAB.409000

Generation of highly pure lower-order Laguerre–Gaussian radial beams using an all-fiber multimode interference method

Nitin Bhatia

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Nitin Bhatia, "Generation of highly pure lower-order Laguerre–Gaussian radial beams using an all-fiber multimode interference method," J. Opt. Soc. Am. B 38, 1069-1077 (2021)

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Abstract

We show that the output beam exiting from the end facet of a single-mode–multimode–few-mode device can be designed to be a highly pure $\textit{LG}_0^0$ or $\textit{LG}_1^0$ mode. Our investigation provides a method to generate $\textit{LG}$ beams in free space using a low-cost, all-fiber solution that also shows potential for an integrated device.

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Parameters	Design 1	Design 2	Design 3	Design 4
Wavelength	1550 nm	1550 nm	1550 nm	1551 nm
MMF Length ( $L_{1}$ )	$49388 µ m$	$29480 µ m$	$49398 µ m$	$49355 µ m$
FMF Length ( $L_{2}$ )	$35816 µ m$	$35665 µ m$	$34180 µ m$	$35816 µ m$
FMF mode	$99.99 %$ $L P_{0, 1}$	$99.46 %$ $L P_{0, 2}$	$99.99 %$ $L P_{0, 1}$	$99.70 %$ $L P_{0, 1}$
Free-space mode	$99.25 %$ ${LG}_{0}^{0}$	$98.13 %$ ${LG}_{1}^{0}$	$99.52 %$ ${LG}_{0}^{0}$	$99.45 %$ ${LG}_{0}^{0}$
$ω_{0}$	$10.1 µ m$	$8.8 µ m$	$9.5 µ m$	$9.6 µ m$

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Journal of the Optical Society of America B