Optical phase conjugation for nonlinearity compensation of 1.21-Tb/s pol-mux coherent optical OFDM

We experimentally demonstrate mid-span spectral inversion for fiber nonlinearity compensation of a 1.21-Tb/s polarization multiplexed coherent optical OFDM system. For 800-km link, the nonlinear threshold was improved by 2.8 dB. To our knowledge, this is the first demonstration of all-optical nonlinearity compensation of a dual polarization coherent optical OFDM system.