Abstract
We have realized the first field transmission of 8 × 216.8-Gb/s Nyquist
wavelength-division-multiplexing (N-WDM) signals over 1750-km G.652 fiber consisting of
950-km real and 800-km lab fibers with erbium-doped fiber amplifier (EDFA)-only
amplification. The average loss per span is 21.6 dB. Each channel is modulated with
54.2-Gbaud (216.8-Gb/s) polarization-division-multiplexing carrier-suppressed
return-to-zero quadrature-phase-shift-keying (PDM-CSRZ-QPSK) data on a 50-GHz grid
giving a record spectral efficiency (SE) of 4 b/s/Hz. Digital post filtering and 1-bit
maximum likelihood sequence estimation (MLSE) are introduced into the offline digital
signal processing (DSP) at the receiver to suppress noise, linear crosstalk and
filtering effects. We have also investigated the co-transmission of 200 G PDM-CSRZ-QPSK
and 200 G PDM 16-ary quadrature-amplitude-modulation (PDM-16 QAM) signals on a 50-GHz
grid, and found that PDM-CSRZ-QPSK signals have better bit-error-rate (BER) performance
for both back-to-back and 700-km transmission cases. Meanwhile, PDM-16 QAM signals are
subject to larger crosstalk from the neighboring Nyquist QPSK channels.
© 2012 IEEE
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