Kuo, Bill P.-P.Myslivets, EvgenyWiberg, Andreas O. J.Zlatanovic, SanjaBrès, CamilleMoro, SlavenGholami, FaezehPeric, anaAlic, NikolaRadic, Stojan2011-12-122011-12-122011-12-12201110.1109/JLT.2010.2103354https://infoscience.epfl.ch/handle/20.500.14299/73076We report the first demonstration of 640-Gb/s return-to-zero ON-OFF keying channel transmission over a 100-km standard single-mode fiber link employing midspan phase conjugation. A frequency-degenerate conjugate field spanning more than 20 nm is created in a low-birefringence parametric mixer for the first time. Physical separation of the conjugate field from the original field is enabled by utilizing pump polarization nondegeneracy. Rigorous link characterization using a high-quality 640-Gb/s transmitter and a high-sensitivity receiver revealed error-free (bit error ratio <;10-9) performance, eliminating the need for impractical fiber length control or electronic signal processing. The compatibility of wavelength-transparent conjugation with spectrally inefficient channel implies that channels with higher bit rates and better spectral efficiency can also be compensated.Dispersion compensationfour-wave mixingoptical time-division multiplexingphase conjugationtext::journal::journal article::research article