Abstract
We demonstrate that channel spacing can be reduced to values smaller than the
Nyquist channel spacing over transoceanic distance. Modulation memory induced by
constrained transmitter bandwidth together with multisymbol detection can reduce
intersymbol interference for systems with sub-Nyquist channel spacing. We transmit
198 × 100 G bandwidth constrained polarization-division-multiplexed
return-to-zero quaternary phase shift keying channels with 400% spectral efficiency over
6860 km using 52 km spans of 150 μm<sup>2</sup> fiber and simple single-stage erbium-doped
fiber amplifiers without any Raman amplification. We also show that 100 G coherent
nonlinear performance scales differently with distance on uncompensated dispersion maps
compared with direct detection transmission.
© 2011 IEEE
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