Benefiting from the high spectrum efficiency and power efficiency, 6PolSK-QPSK (6-ary polarization-shift keying quadrature phase-shift keying) is a promising modulation format in coherent optical communication. We proposed a novel structure to generate the 6PolSK-QPSK with two dual-drive MZMs. Simulation results show that the proposed structure can generate 6PolSK-QPSK effectively and the perfo...

We show for the first time, to the best of our knowledge, that, in a coherent communication system that employs a phase-shift-keying signal and Raman amplification, besides the pump relative intensity noise (RIN) transfer to the amplitude, the signal's phase will also be affected by pump RIN through the pump-signal cross-phase modulation. Although the average pump power induced linear phase cha...

We use a recent numerical security proof approach to calculate tight secure key rates in the presence of collective attacks for continuous-variable (CV) eight-state phase-shift keying (8PSK) protocol with heterodyne detection asymptotic limit. The results are compared achievable QPSK obtained same technique. Furthermore, we investigate influence radial postselection on rate and examine recently...