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Impact of four-wave-mixing in polarisation multiplexed 12.5 GHz channel spacing WDM systems

The impact of four-wave-mixing (FWM) induced crosstalk in medium haul WDM systems with 12.5 GHz channel spacing is investigated. Adjacent channel polarisation and channel powers are varied. By using an orthogonal polarisation scheme, FWM efficiency is significantly reduced. Differential Group Delay (DGD) has no significant impact on FWM efficiency in the investigated polarisation multiplexed system.