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

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(a) The BTB BER results versus the OSNR for 75 and 125-GBaud all-optical PDM-QPSK signals comparing with theoretical curves; (b) The transmission BER results of 75 and 125-GBaud all-optical PDM-QPSK signals versus the transmission distance.