All-optical 3R regeneration at 40 Gb/s in a recirculating loop utilizing raman amplification, nonlinear phase modulation, and offset filtering

The performance of an all-optical 3R regenerator for 40 Gb/s RZ-OOK signals is investigated experimentally using a recirculating loop. A power penalty of 1.2 dB is obtained for 100 loops (8,000 km).