Abstract

We demonstrate a 2Tbit/s free-space data link using two orthogonal orbital angular momentum beams each carrying 25 different wavelength-division-multiplexing channels. We measure the performance for different modulation formats, including directly detected 40Gbit/s nonreturn-to-zero (NRZ) differential phase-shift keying, 40Gbit/s NRZ on-off keying, and coherently-detected 10 Gbaud NRZ quadrature phase-shift keying, and achieve low bit error rates with penalties less than 5 dB.

© 2012 Optical Society of America

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