Abstract
Non-uniform step-size distribution is implemented for split-step based
nonlinear compensation in single-channel 112-Gb/s 16 quadrature amplitude modulation
(QAM) transmission. Numerical simulations of the system including a 20 \times 80 km
uncompensated link are performed using logarithmic step size distribution to
compensate signal distortions. 50% of reduction in number of steps with respect to
using constant step sizes is observed. The performance is further improved by
optimizing nonlinear calculating position (NLCP) in case of using constant step
sizes while NLCP optimization becomes unnecessary when using logarithmic step sizes,
which reduces the computational effort due to uniformly distributed nonlinear phase
for all successive steps.
© 2012 Chinese Optics Letters
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