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

Guoxuan Zhu, Ziyang Hu, Xiong Wu, Cheng Du, Wenyong Luo, Yujie Chen, Xinlun Cai, Jie Liu*, Jiangbo Zhu, Siyuan Yu

*Corresponding author for this work

Research output: Contribution to journalArticle (Academic Journal)peer-review

65 Citations (Scopus)
467 Downloads (Pure)

Abstract

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 intra-mode-group differential group delay, and small group velocity dispersion slope over the C-band 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.
Original languageEnglish
Pages (from-to)594-604
Number of pages11
JournalOptics Express
Volume26
Issue number2
Early online date8 Jan 2018
DOIs
Publication statusPublished - 22 Jan 2018

Keywords

  • Fiber optics
  • Multiplexing
  • Optical communications
  • Optical vortices

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