Dual-polarization 2×2 IFFT/FFT optical signal processing for 100-Gb/s QPSK-PDM all-optical OFDM

Dual-polarization operation of all-optical IFFT/FFT elements is demonstrated for the first time employing coupler interferometry. All-optical OFDM transmission at 100-Gb/s for two QPSK-PDM sub-carriers was experimentally performed using two matched 25 G DMZIs and coherent detection.