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. 2014 Aug 21;4:6156. doi: 10.1038/srep06156

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(a) shows the off-line DSP blocks for the Nyquist QPSK signal recovery. (b) shows the back-to-back BER performance of the generated all-optical Nyquist 62.5, 75 and 125-GBaud QPSK signal versus the optical signal-noise-ratio (OSNR in 0.1 nm reference bandwidth) is measured compared with the theoretical values.