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Appl. Sci. 2018, 8(3), 326; https://doi.org/10.3390/app8030326

Capacity Enhancement of Few-Mode Fiber Transmission Systems Impaired by Mode-Dependent Loss

LTCI, Télécom ParisTech, 46 Rue Barrault, 75013 Paris, France
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Received: 24 January 2018 / Revised: 16 February 2018 / Accepted: 17 February 2018 / Published: 26 February 2018
(This article belongs to the Special Issue DSP for Next Generation Fibre Communication Systems)
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Abstract

Space-division multiplexing over few-mode fibers is a promising solution to increase the capacity of the future generation of optical transmission systems. Mode-dependent loss (MDL) is known to have a detrimental impact on the capacity of few-mode fiber systems. In the presence of MDL, spatial modes experience different attenuations which results in capacity reduction. In this work, we propose a digital signal processing solution and an optical solution to mitigate the impact of MDL and improve the channel capacity. First, we show that statistical channel state information can be used for a better power allocation for spatial modes instead of equal launch power to increase the system capacity. Afterwards, we propose a deterministic mode scrambling strategy to efficiently reduces the impact of MDL and improves few-mode fiber systems capacity. This scrambling strategy can be efficiently combined with the optimal power allocation to further enhance the capacity. Through numerical simulations of the average and outage capacities, we show that the proposed techniques bring significant capacity gains. View Full-Text
Keywords: optical communications; space-division multiplexing; few-mode fibers; mode-dependent loss; multiple-input multiple-output (MIMO); channel state information; mode scrambling optical communications; space-division multiplexing; few-mode fibers; mode-dependent loss; multiple-input multiple-output (MIMO); channel state information; mode scrambling
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Amhoud, E.-M.; Rekaya-Ben Othman, G.; Jaouën, Y. Capacity Enhancement of Few-Mode Fiber Transmission Systems Impaired by Mode-Dependent Loss. Appl. Sci. 2018, 8, 326.

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