Experimental characterization of a 400 Gbit/s orbital angular momentum multiplexed free-space optical link over 120 m
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- 29 January 2016
- journal article
- Published by Optica Publishing Group in Optics Letters
- Vol. 41 (3), 622-625
- https://doi.org/10.1364/ol.41.000622
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 for all channels. Both experimental and simulation results show that power penalties increase rapidly when the displacement increases.
Keywords
Funding Information
- Air Force Office of Scientific Research (AFOSR)
- NxGen Partners
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