Crosstalk mitigation in a free-space orbital angular momentum multiplexed communication link using 4×4 MIMO equalization

Hao Huang, Yinwen Cao, Guodong Xie, Yongxiong Ren, Yan Yan, Changjing Bao, Nisar Ahmed, Mark A. Neifeld, Samuel J. Dolinar, Alan E. Willner

Research output: Contribution to journalArticlepeer-review

78 Scopus citations

Abstract

We demonstrate crosstalk mitigation using 4 × 4 multiple-input- multiple-output (MIMO) equalization on an orbital angular momentum (OAM) multiplexed free-space data link with heterodyne detection. Four multiplexed OAM beams, each carrying a 20 Gbit/s quadrature phase-shift keying signal, propagate through weak turbulence. The turbulence induces inter-channel crosstalk among each beam and degrades the signal performance. Experimental results demonstrate that with the assistance of MIMO processing, the signal quality and the bit-error-rate (BER) performance can be improved. The power penalty can be reduced by >4 dB at a BER of 3.8 × 10-3.

Original languageEnglish (US)
Pages (from-to)4360-4363
Number of pages4
JournalOptics letters
Volume39
Issue number15
DOIs
StatePublished - Aug 1 2014

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

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