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Raman-amplification-assisted twisted light multiplexing transmission over large-core fiber

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Abstract

Twisted light-carrying orbital angular momentum (OAM) with a helical phase front and doughnut intensity profile has been widely investigated in fiber-optic communications. To facilitate long-distance OAM mode multiplexing transmission, an efficient OAM (de)multiplexer and a suitable inline OAM amplifier are highly desired. Here, we demonstrate three OAM modes and 22 wavelength channels multiplexing transmission with an OAM distributed Raman amplifier (DRA) over 110-km large-core fiber assisted by a homemade all-fiber OAM (de)multiplexer. To characterize the performance of the OAM DRA, two pump configurations including the first-order bidirectional pumping and second-order backward pumping are proposed and demonstrated. The obtained results indicate the successful implementation of the long-distance OAM mode multiplexing transmission assisted by the DRA and an all-fiber OAM (de)multiplexer with favorable performance. These demonstrations may open up new perspectives for ultra-long-haul capacity scaling fiber-optic communications employing OAM modes.

© 2023 Optica Publishing Group

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Data availability

The authors declare that the data supporting the findings of this paper are available within the article. Any source data deemed relevant is available from the corresponding author on request.

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