Abstract
We investigate experimentally and theoretically the statistics of optical signal-to-noise ratio (OSNR) and Q-factor after 1800 km of propagation with three channel spacings in a typical terrestrial wavelength-division-multiplexing (WDM) system with a fixed loop polarization-dependent loss (PDL) level of 0.75 dB. Comparisons between measured and simulated results show that fiber drift contributes significantly to the OSNR and Q fluctuations, and decreasing channel spacing reduces the PDL-induced performance fluctuations, but increases the interchannel crosstalk-induced performance fluctuations, especially at the 50-GHz channel spacing. The combination of these factors leads to comparable performance statistics with these channel spacings.
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