Abstract
We 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.
© 2011 IEEE
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