Impact of bi-directional crosstalk on power budget in wavelength reuse DWDM systems

A detailed investigation of multigigabit wavelength reuse DWDM system tolerance to bidirectional crosstalk, conditioned by the maximum seed power budget and channel spacing, was preformed. Maximum tolerated seed powers were measured for DSF and SMF, for 10 Gb/s NRZ US signal. We demonstrated that high power regime reveals that the most dominant nonlinear impairment arises for the seed frequency shift coinciding with the SBS anti-Stokes. We assess the optimal seed frequency shift range, allowing a successful trade-off between the seed power budget and enabled spectral efficiency.