High Speed Polarization-Division Multiplexing Transmissions Based on the Nonlinear Fourier Transform

Polarization-division multiplexing(PDM) with modulation in the nonlinear frequency domain consisting of the discrete and/or continuous spectrum has been recently regarded as a useful method to be utilized in optical fiber communication system. It can compensate the optical fiber nonlinearity based on the nonlinear Fourier transform(NFT). In this paper, we combine PDM with the method of nonlinear frequency division multiplexing(NFDM) and demonstrate the achievable transmission rate by increasing the number of multiplexing nonlinear channels. For the selected subcarriers(i.e. 32, 64, and 128), the transmission rates are 64 Gbit/s, 76.8 Gbit/s, and 109.7 Gbit/s respectively by applying 64-quadrature amplitude modulation(64-QAM) on the nonlinear continuous spectrum. For the transmission distance shorter than 1 200 km, the transmission rate of 128-NFDM PDM system can even reach up to 153.6 Gbit/s.