Abstract
This paper focuses on terabit superchannel transmission with enhanced
network reach by using an emerging noise-suppressed Nyquist wavelength division
multiplexing (NS-N-WDM) technique for polarization multiplexing quadrature
phase shift keying subchannels at different symbol rate to subchannel spacing
ratios up to 1.28, and for the first time, it was compared experimentally
with the transmission capability of no-guard-interval coherent optical orthogonal
frequency division multiplexing (NGI-CO-OFDM) on the same testbed. At 2 × 10<sup>-3</sup> bit
error ratio, the maximum reachable distance is 3200 and 2800 km SMF-28 with
erbium-doped-fiber-amplifier-only amplification for NGI-CO-OFDM and NS-N-WDM
terabit superchannels, respectively, at 100 Gb/s/ch. For 11 × 112 and 11 × 128 Gb/s/ch NS-N-WDM transmission
under assumption of different coding gain with hard-decision and soft-decision
forward error correction, their maximum achievable distance was found to be
equivalent, which are 2100 and 2170 km, respectively, both were achieved by
using digital noise filtering and 1-bit maximum likelihood sequence estimation
at the receiver DSP. In addition, the back-to-back characteristics of NS-N-WDM
superchannel such as analog-to-digital converter bandwidth requirement and
its tolerance to unequal subchannel power were experimentally evaluated and
studied.
© 2012 IEEE
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