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. 2015 Sep 1;5:13649. doi: 10.1038/srep13649

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(a) The back-to-back BER vs. OSNR for 125-GBaud all-optical Nyquist PDM-16QAM signal, constellations at (i) X and (ii) Y pol. In the PDM case at OSNR of 33.4 dB; (b) the BER vs. symbol rate for all-optical Nyquist PDM-16QAM signals.