A black box phase sensitive amplifier based 3R regeneration scheme is proposed for non-return to zero quadrature phase shift keyed formatted signals. Performance improvements of more than 2 dB are achieved at the presence of input phase distortion.
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Funding: Marie Curie - IEF project ARTISTE (IEF 330697); EPSRC projects UNLOC and PEACE (EP/J017582/1 and EP/L000091/1); and EU-ICT project FOX-C (grant number 318415)