1.2 Tb/s Superchannel Transmission Over 80 $\,\times\,$100 km ULAF Using Nyquist FDM DP-QPSK

Employing 8-bit 65GSps digital-to-analog converters with pre-equalization and Nyquist pulse-shaping, we generated a terabit superchannel based on both low-baud-rate Nyquist frequency-division-multiplexing (FDM) dual polarization quadrature-phase-shift-keying (DP-QPSK) and high-baud-rate Nyquist DP-QPSK signals. The 1.2-Tb/s superchannel transmission over 80
$\,\times\,$
100 km ultra-large-area fiber with effective area
$(A_{\rm eff})$
of 125
$\mu{\rm m}^{2}$
was demonstrated using erbium doped fiber amplifier only spans. We further discussed the roll-off factor
$(\alpha)$
in Nyquist pulse-shaping on the system optimization. It has been found that the Nyquist FDM DP-QPSK signal outperforms the high-baud-rate Nyquist DP-QPSK. Given the same data capacity, the Nyquist FDM DP-QPSK scheme exhibits better tolerance to fiber nonlinearities.