Abstract
Fiber nonlinearity limits the use of coherent optical orthogonal frequency division
multiplexing (CO-OFDM) to upgrade wavelength-division multiplexing (WDM) systems using legacy
non-return-to-zero-on-off-keying (NRZ-OOK) channels. This letter proposes to compensate for the
fiber nonlinearity of CO-OFDM with NRZ-OOK neighbors by combining digital signal processing
(DSP)-based self-phase modulation (SPM) post-compensation with pilot-tone-based cross-phase
modulation (XPM) compensation. The simulation results demonstrate that the optimum low-pass filter
bandwidth for pilot-tone-based XPM compensation depends on the pilot-to-signal ratio value and
launch optical power. Our method allows a 4-dB increase in the launch power for a 40-Gb/s single
polarization CO-OFDM channel placed in the middle of six 10.7-Gb/s NRZ channels in a 50-GHz space
and 1 200-km WDM system.
© 2012 Chinese Optics Letters
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