Nonlinear tolerance of 112-Gb/s DP-QPSK in a live field upgrade trial over a 848km 10G DWDM link

An in-service field trial with coherently detected DP-QPSK at 112 Gb/s was performed over a Telefónica live link of 848km, testing long term stability and determining noise margin and optimum launch power of the format.

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