Numerical evaluation of the functional boundaries of digital backward propagation algorithm for mitigating non-linear impairments in phase encoded transmission

We numerically evaluate the robustness of digital backward propagation (DBP) algorithm for the mitigation of fiber transmission impairments in phase encoded transmission. We have investigated DBP algorithm by varying physical parameters of transmission i.e. bit rates, modulation formats, fiber transmission length and fiber spans of unequal length. The system performance is evaluated by Q-factor. Through the imperative evaluation of the effective transmission impairments mitigation at different instants, we identify functional limits of DBP algorithm. These methodological studies could be used in next generation optical networks to formulate flexibility in the algorithm to adopt and identify changes in the physical network paths.