4.6 Article

Scalable mode division multiplexed transmission over a 10-km ring-core fiber using high-order orbital angular momentum modes

Journal

OPTICS EXPRESS
Volume 26, Issue 2, Pages 594-604

Publisher

OPTICAL SOC AMER
DOI: 10.1364/OE.26.000594

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Funding

  1. National Basic Research Program of China (Program 973) [2014CB340000]
  2. National Natural Science Foundations of China (NSFC) [61490715, 61505266, 61323001, 11690031, 51403244, 61575224, 61622510]
  3. Science and Technology Program of Guangzhou [201707020017]
  4. European Union Horizon (ROAM)

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We propose and demonstrate a scalable mode division multiplexing scheme based on orbital angular momentum modes in ring core fibers. In this scheme, the high-order mode groups of a ring core fiber are sufficiently de-coupled by the large differential effective refractive index so that multiple-input multiple-output (MIMO) equalization is only used for crosstalk equalization within each mode group. We design and fabricate a graded-index ring core fiber that supports 5 mode groups with low inter-mode-group coupling, small intramode- group differential group delay, and small group velocity dispersion slope over the Cband for the high-order mode groups. We implement a two-dimensional wavelength-and mode-division multiplexed transmission experiment involving 10 wavelengths and 2 mode groups each with 4 OAM modes, transmitting 32 GBaud Nyquist QPSK signals over all 80 channels. An aggregate capacity of 5.12 Tb/s and an overall spectral efficiency of 9 bit/s/Hz over 10 km are realized, only using modular 4x4 MIMO processing with 15 taps to recover signals from the intra-mode-group mode coupling. Given the fixed number of modes in each mode group and the low inter-mode-group coupling in ring core fibres, our scheme strikes a balance in the trade-off between system capacity and digital signal processing complexity, and therefore has good potential for capacity upscaling at an expense of only modularly increasing the number of mode-groups with fixed-size (4x4) MIMO blocks. (C) 2018 Optical Society of America under the terms of the OSA Open Access Publishing Agreement

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