Simultaneous turbulence mitigation and channel demultiplexing for two 100 Gbit/s orbital-angular-momentum multiplexed beams by adaptive wavefront shaping and diffusing

We experimentally demonstrate simultaneous turbulence mitigation and channel demultiplexing in a 200 Gbit/s orbital-angular-momentum (OAM) multiplexed link by adaptive wavefront shaping and diffusing (WSD) the light beams. Different realizations of two emulated turbulence strengths (the Fried parameter r 0 = 0.4 , 1.0 m m ) are mitigated. The experimental results show the following. (1) Crosstalk between OAM l = + 1 and l = − 1 modes can be reduced by > 10.0 and > 5.8 d B , respectively, under the weaker turbulence ( r 0 = 1.0 m m ); crosstalk is further improved by > 17.7 and > 19.4 d B , respectively, under most realizations in the stronger turbulence ( r 0 = 0.4 m m ). (2) The optical signal-to-noise ratio penalties for the bit error rate performance are measured to be ∼ 0.7 and ∼ 1.6 d B under weaker turbulence, while measured to be ∼ 3.2 and ∼ 1.8 d B under stronger turbulence for OAM l = + 1 and l = − 1 mode, respectively.