Dual-polarisation Non-linear Frequency-division Multiplexed Transmission with b-Modulation

Recently, nonlinear frequency-division multiplexing has attracted a lot of attention as a potential transmission scheme for combating the fibre non-linearity. Up to date, most of the demonstrated NFDM schemes uses only a one polarisation for data transmission. Employing both polarisations can double the data rates of NFDM systems. In this paper, we proposed and investigated in simulation a dual-polarisation NFDM transmission with data modulated on the $b$-coefficient, achieving a record net data rate of 400 Gbps (SE of 7.2 bit/s/Hz) over 960 km. The proposed scheme shows 1 dB Q-factor improvement over $q_c$-modulation scheme. The advantages of $b$-modulation over $q_c$-modulation are analysed in terms of correlation and joint entropy. Further remarks on the algorithm and non-integrability of the channel are also included.