  We apply in simulation a reservoir computer based on evanescently coupled
GaAs microrings for real-time compensation of a nonlinear distortion of a 50
Gbaud 16-QAM signal with the launch power up to 12 dBm in a standard
single-mode optical fibre. We clearly evidence the crucial role of fast
nonlinear response in enabling all-optical signal recovery in real time. With
our system we are able to reduce the signal error rate below the forward error
correction limit for a 20 km fibre and 12 dBm launch power.
