We numerically optimise in-span signal power asymmetry in different advanced Raman amplification schemes, achieving a 3% asymmetry over 62 km SMF using random DFB Raman laser amplifier. We then evaluate the impact of such asymmetry on the performance of systems using mid-link OPC by simulating transmission of 7 x 15 Gbaud 16QAM Nyquist-spaced WDM-PDM signals. (C) 2015 Optical Society of America
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Funding: EU through the Marie Skłodowska-Curie IF CHAOS for P. Rosa (658982) and FP7 ITN programme ICONE (608099), Spanish MICINN Grant RAMAS (TEC2011-27314), SINFOTON (S2013/MIT-2790-SINFOTON-CM) and UK EPSRC
Programme Grant UNLOC (EP/J017582/1).