Abstract
Coherent
optical frequency-division multiplexing (CO-OFDM) is one of the promising
pathways toward future ultrahigh capacity transparent optical networks. In
this paper, numerical simulation is carried out to investigate the
feasibility of 1 Tb/s per channel CO-OFDM transmission. We find that, for
1Tb/s CO-OFDM signal, the performance difference between
single channel and wavelength division multiplexing (WDM) transmission is
small. The maximum Q is 13.8 and 13.2 dB respectively for single channel and
WDM transmission. We also investigate the CO-OFDM performance on the upgrade
of 10-Gb/s to 100-Gb/s based DWDM systems with 50-GHz channel spacing to
100-Gb/s systems. It is shown that due to the high spectral efficiency and
resilience to dispersion, for 100-Gb/s CO-OFDM signals, only
1.3dB Q penalty is observed for 10 GHz laser frequency
detuning. A comparison of CO-OFDM system performance under different data
rate of 10.7 Gb/s, 42.8 Gb/s, 107 Gb/s and 1.07 Tb/s with and without the
impact of dispersion compensation fiber is also presented. We find that the
optimum fiber launch power increases almost linearly with the increase of
data rate. 7 dB optimum launch power difference is observed between 107 Gb/s
and 1.07 Tb/s CO-OFDM systems.
© 2009 IEEE
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