Experimental characterization of a 400&#x2009;&#x2009;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

doi:10.1364/OL.41.000622

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, and Alan E. Willner

Optics Letters
Vol. 41,
Issue 3,
pp. 622-625
(2016)
•https://doi.org/10.1364/OL.41.000622

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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, and Alan E. Willner, "Experimental characterization of a 400 Gbit/s orbital angular momentum multiplexed free-space optical link over 120 m," Opt. Lett. 41, 622-625 (2016)

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Table of Contents Category
- Fiber Optics and Optical Communications
Optics & Photonics Topics
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Previously assigned OCIS codes
- Multiplexing (060.4230)
- Free-space optical communication (060.2605)

About this Article
History
- Original Manuscript: October 5, 2015
- Revised Manuscript: December 1, 2015
- Manuscript Accepted: December 9, 2015
- Published: January 29, 2016

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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 $3.8 \times 10^{- 3}$ for all channels. Both experimental and simulation results show that power penalties increase rapidly when the displacement increases.

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AveragePower	RX $ℓ = - 1$	RX $ℓ = + 1$	RX $ℓ = - 3$	RX $ℓ = + 3$
TX $ℓ = - 1$	−8.5	−29.0	−26.3	−34.1
TX $ℓ = + 1$	−27.5	−9.0	−27.5	−28.4
TX $ℓ = - 3$	−22.5	−32.5	−11.3	−45.8
TX $ℓ = + 3$	−34.5	−24.5	−43.2	−11

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