Abstract
Coherent optical orthogonal frequency-division multiplexed (OFDM) systems
with uniform chromatic dispersion can efficaciously combat both fiber dispersion
by utilizing the properties of the cyclic prefix and four-wave mixing (FWM)
among the individual subcarriers via the phased-array effect in dispersive
fiber links. Such excellent performance, however, often implies appreciable
sacrifices in data rate, since a long cyclic prefix is required to compensate
for the dispersion accumulated at the receiver.The spectral efficiency of such OFDM systems may be substantially improved
by dispersion management. Dispersion-compensating fibers placed periodically
along the transmission line can significantly shorten the channel memory thereby
allowing a reduction in the cyclic prefix overhead. However, the FWM tolerance
of such dispersion-managed (DM) links may suffer considerably.In this work, the application of optical phase conjugation (OPC) to
DM OFDM systems is investigated. Several systems set-ups are considered, and
the degrees of inter-subcarrier FWM suppression are estimated analytically
for arbitrary dispersion map parameters. A comparison is also made against
links with uniform chromatic dispersion. Despite their inherently inferior
FWM tolerance properties, DM OFDM systems can be made quite competitive with
the application of OPC.
© 2011 IEEE
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