Abstract
We develop a theoretical expression to predict the ultimate back-to-back
performance of coherent optical orthogonal frequency-division multiplexing
(CO-OFDM) systems that rely on four-wave mixing to achieve phase conjugation
for mid-span spectral inversion. Our analysis shows that two different two-stage
nonlinear processes produce strong noise-like products in the conjugated signal
band. We verify our theoretical results with simulations and experiments;
these both show excellent agreement with the analytical theory. We identify
the optimal design parameters and predict that optical phase conjugation of
10 THz wide orthogonal frequency-division multiplexing signals could be possible,
given appropriate dispersion management of the nonlinear element. We also
experimentally demonstrate the benefit of MSSI in an 800 km transmission of
CO-OFDM.
© 2012 IEEE
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