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Kerr nonlinearity mitigation: Mid-link spectral inversion versus digital backpropagation in 5x28-GBd PDM 16-QAM signal transmission

: Sackey, I.; Da Ros, F.; Fischer, J.K.; Richter, T.; Jazayerifar, M.; Peucheret, C.; Petermann, K.; Schubert, C.


Journal of Lightwave Technology 33 (2015), Nr.9, S.1821-1827
ISSN: 0733-8724
Deutsche Forschungsgemeinschaft DFG
GR 3774/11
Deutsche Forschungsgemeinschaft DFG
PE 319/26-1
Bundesministerium für Bildung und Forschung BMBF
Fraunhofer HHI ()

We experimentally investigate Kerr nonlinearity mitigation of a 28-GBd polarization-multiplexed 16-QAM signal in a five-channel 50-GHz spaced wavelength-division multiplexing (WDM) system. Optical phase conjugation (OPC) employing the mid-link spectral inversion technique is implemented by using a dual-pump polarization-independent fiber-optic parametric amplifier and compared to digital backpropagation (DBP) compensation over up to 800-km in a dispersion-managed link. In the single-channel case, the use of the DBP algorithm outperformed the OPC with a Q-factor improvement of 0.9 dB after 800-km transmission. However, signal transmission was not possible with DBP in the WDM scenario over the same link length while it was enabled by the OPC with a maximum Q-factor of 8.6 dB.