Simultaneous Generation of 1.024-Tb/s Nyquist-WDM Phase-Conjugated Twin Vector Waves through Polarization-Insensitive Optical Parametric Amplification Enabling Transmission over 4000-km Dispersion-Managed TWRS Fiber

We experimentally generate 1.024-Tb/s Nyquist-WDM phase-conjugated twin waves consisting of eight 128-Gb/s PDM-QPSK signals and their corresponding idlers, converted by a broadband polarization-insensitive optical parametric amplifier. The coherent superposition of the idlers and the signals after nonlinear transmission more than doubles the reach.