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. 2021 Jul 22;21(15):4988. doi: 10.3390/s21154988

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© 2021 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).

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HG-similar mode field allocations in the WG (a–d) [163], WG configuration for concurrently managing l = ±1 OAM mode and l = ±2 OAM mode (e) [163], mode n_eff reliance on WG parameters (f) [163].