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1614km link over TrueWave-RS fibre carrying 10G live traffic was successfully upgraded to 40Gb/s. XPM affecting 40G channels is simulated and experimentally measured for different channel powers and channel allocations. Upgrade to 100G is discussed.
An in-service field trial with coherently detected DP-QPSK at 112 Gb/s was performed over a Telefónica live link of 848 km, testing long term stability and determining noise margin and optimum launch power of the format.
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