Abstract
We present digital signal processing techniques and
algorithms for improving the tolerance of polarization-division multiplexed
(PDM) coherent optical orthogonal frequency-division multiplexing (CO-OFDM)
to fiber nonlinear effects, in both single-channel and wavelength-division
multiplexed (WDM) transmission. For single-channel transmission, we discuss
a self-phase modulation (SPM) compensation method that jointly processes two
polarization components of a PDM CO-OFDM signal. For WDM transmission, we
describe a novel OFDM channel estimation scheme that reduces the
cross-phase-modulation (XPM) penalty among the WDM channels. The nonlinear
tolerance improvements enabled by these signal processing techniques are
quantified through numerical simulations for both dispersion-unmanaged and
dispersion-managed long-haul optical fiber transmission with 112-Gb/s PDM
CO-OFDM wavelength channels.
© 2009 IEEE
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