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Each dataset contains the received constellation signal to noise ratio as a function of the launch optical power into each span. Experiment: 10 spans, 100km of SSMF with launch VOA and post span EDFA. Signal 31.7 GBd PM-QPSK private signal modulated by Ciena WaveLogic3 and received by a 25 GHz ICR, 100GSa DSO, and private DSP. The data file in Matlab format 7.3, contains a single structure with: Results. Description-some notes Results. LP-launch powers into each span, and receiver [dBm] Results. mleSNR-constellation SNR [dB] Results. base_LP-prior knowledge or start point or sweep centre of optimum [dBm]