Nonlinear limitations in a joint transmission of 100Gb/s O-OFDM and 40Gb/s DPSK over a 50 GHz channel grid

We evaluate the nonlinearity impact of neighbouring DPSK DWDM channels on one 100 Gb/s PDM-OFDM channel. A new DSP-based SPM correction scheme enables complete compensation of the degradation of the nonlinear threshold of 1.8 dB.