Impact of nonlinear fibre impairments in 112 Gb/s PM-QPSK transmission with 43 Gb/s and 10.7 Gb/s neighbours

We numerically investigate the nonlinear tolerance of 112 Gb/s polarization multiplexed quadrature phase-shift keying co-propagating with 43 Gb/s differential quadrature phase shifted keying and 10.7 Gb/s amplitude modulated phased shifted keying and non-return-to-zero on-off keying neighbours under various dispersion maps. The results indicate that with phase-modulated neighbours, considerable tolerance to nonlinear effects is observed both with and without inline optical compensation whilst inline dispersion compensation greatly increases the influence of fibre nonlinearity arising from intensity-modulated low bit-rate neighbouring channels. No significant nonlinear cross polarization effects are observed with either single polarization or polarization multiplexed neighbouring channels due to the dominance of cross phase modulation.