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We report on a set of transmission experiments over seven different uncompensated fiber links carrying a 22-channel Nyquist-WDM signal comb based on polarization-multiplexed 16-quadrature amplitude modulation at Rₒ=15. 625~ GBd (R₁=125~ Gb/ s). The channel spacing was f=16~ GHz. The experimental transmission performance was compared with analytical GN-model predictions showing a good agreement for all seven considered fiber types. Moreover, we used the experimental results for the validation of a fiber figure of merit based on the maximum reach, showing its effectiveness for approximate fiber performance prediction. Within the experimental tests, a maximum transmission distance of 3810 km at a bit error-rate of 1. 5 10^{-2} was achieved using a pure-silica-core fiber with 150 m^{2} effective area, at a net spectral-efficiency-distance product of 24700 (b km) / (s~ Hz), in a good agreement with the GN-model forecast.
Nespola et al. (Wed,) studied this question.
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