Experimental characterization of a 400 Gbit/s orbital angular momentum multiplexed free-space optical link over 120 m

Yongxiong Ren, Zhe Wang, Peicheng Liao, Long Li, Guodong Xie, Hao Huang, Zhe Zhao, Yan Yan, Nisar Ahmed, Asher Willner, Martin P.J. Lavery, Nima Ashrafi, Solyman Ashrafi, Robert Bock, Moshe Tur, Ivan B. Djordjevic, Mark A. Neifeld, Alan E. Willner

Research output: Contribution to journalArticle

85 Scopus citations

Abstract

We experimentally demonstrate and characterize the performance of a 400-Gbit/s orbital angular momentum (OAM) multiplexed free-space optical link over 120 m on the roof of a building. Four OAM beams, each carrying a 100-Gbit/s quadrature-phase-shift-keyed channel are multiplexed and transmitted. We investigate the influence of channel impairments on the received power, intermodal crosstalk among channels, and system power penalties. Without laser tracking and compensation systems, the measured received power and crosstalk among OAM channels fluctuate by 4.5 dB and 5 dB, respectively, over 180 s. For a beam displacement of 2 mm that corresponds to a pointing error less than 16.7 μrad, the link bit error rates are below the forward error correction threshold of 3.8 × 10-3for all channels. Both experimental and simulation results show that power penalties increase rapidly when the displacement increases.

Original languageEnglish (US)
Pages (from-to)622-625
Number of pages4
JournalOptics letters
Volume41
Issue number3
DOIs
StatePublished - Feb 1 2016

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

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    Ren, Y., Wang, Z., Liao, P., Li, L., Xie, G., Huang, H., Zhao, Z., Yan, Y., Ahmed, N., Willner, A., Lavery, M. P. J., Ashrafi, N., Ashrafi, S., Bock, R., Tur, M., Djordjevic, I. B., Neifeld, M. A., & Willner, A. E. (2016). Experimental characterization of a 400 Gbit/s orbital angular momentum multiplexed free-space optical link over 120 m. Optics letters, 41(3), 622-625. https://doi.org/10.1364/OL.41.000622