High-fidelity spatial mode transmission through a 1-km-long multimode fiber via vectorial time reversal

Yiyu Zhou (), Boris Braverman, Alexander Fyffe, Runzhou Zhang, Jiapeng Zhao, Alan E. Willner, Zhimin Shi and Robert W. Boyd
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Yiyu Zhou: University of Rochester
Boris Braverman: University of Ottawa
Alexander Fyffe: University of South Florida
Runzhou Zhang: University of Southern California
Jiapeng Zhao: University of Rochester
Alan E. Willner: University of Southern California
Zhimin Shi: University of South Florida
Robert W. Boyd: University of Rochester

Nature Communications, 2021, vol. 12, issue 1, 1-7

Abstract: Abstract The large number of spatial modes supported by standard multimode fibers is a promising platform for boosting the channel capacity of quantum and classical communications by orders of magnitude. However, the practical use of long multimode fibers is severely hampered by modal crosstalk and polarization mixing. To overcome these challenges, we develop and experimentally demonstrate a vectorial time reversal technique, which is accomplished by digitally pre-shaping the wavefront and polarization of the forward-propagating signal beam to be the phase conjugate of an auxiliary, backward-propagating probe beam. Here, we report an average modal fidelity above 80% for 210 Laguerre-Gauss and Hermite-Gauss modes by using vectorial time reversal over an unstabilized 1-km-long fiber. We also propose a practical and scalable spatial-mode-multiplexed quantum communication protocol over long multimode fibers to illustrate potential applications that can be enabled by our technique.

Date: 2021
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DOI: 10.1038/s41467-021-22071-w

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