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. 2014 Sep 16;5:4876. doi: 10.1038/ncomms5876

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(a) Constellations of the received 1-Gbaud 16-QAM signals for OAM channel ℓ=+3 under single Y-pol and dual-pol conditions. The SNR is 19 dB. (b) Measured BER curves of 1-Gbaud 16-QAM signals for (i) a single OAM channel (no crosstalk), (ii) four OAM channels on Y-pol (with crosstalk, Y-pol) and (iii) eight OAM channels on both X-and Y-pol (with crosstalk, X-pol and Y-pol).