Abstract
A pragmatic coded modulation system is presented that incorporates signal shaping
and exploits the excellent performance and efficient high-speed decoding architecture of
staircase codes. Reliable communication within 0.62 bits/s/Hz of the estimated capacity
(per polarization) of a system with <i>L</i>=2000 km is provided by the proposed system,
with an error floor below 10<sup>-20</sup>. Also, it is shown that digital
backpropagation increases the achievable spectral efficiencies—relative to linear
equalization—by 0.55 to 0.75 bits/s/Hz per polarization.
© 2012 IEEE
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