Abstract
For 112 Gb/s dual-polarization 16-ary quadrature amplitude
modulation systems, the performance and complexity of the low-pass filter
(LPF)-assisted digital back-propagation (DBP) algorithm for mitigating intrachannel
fiber nonlinearity are investigated. Comparison is made with both linear equalization
and the standard DBP algorithm for single-channel transmission (simulation
and experiment) and for wavelength division multiplexed (WDM) transmission
with channel spacings of 50 and 35 GHz (simulation). With optimized values
for the algorithm parameters, the simulation results show that, compared to
linear equalization, the 0.2 steps/span LPF-assisted DBP algorithm can increase
the transmission distance by 84%, 40%, and 17% for a single-channel, 50 GHz
channel-spaced WDM, and 35 GHz channel-spaced WDM transmission, respectively.
These improvements in the transmission distance are 54%, 75%, and 77% of those
achieved with the 4 steps/span standard DBP algorithm but at considerably
lower complexity. Single-channel experimental results show that the 0.25 steps/span
LPF-assisted DBP algorithm can increase the transmission distance by 43%,
which is 68% of the improvement achieved with the 4 steps/span standard DBP
algorithm. Compared to the standard DBP algorithm, the LPF-assisted DBP algorithm
can allow a reduction in the number of steps/span, but with an increased computational
complexity for each step. The two DBP algorithms are compared in terms of
the number of real multiplications per bit, thus allowing the algorithm with
lower complexity to be determined at a given level of performance.
© 2012 IEEE
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