Abstract
We address perturbative models for the impact of nonlinear
propagation in uncompensated links. We concentrate on a recently-proposed
model which splits up the signal into spectral components and then resorts
to a four-wave-mixing-like approach to assess the generation of nonlinear
interference due to the beating of the signal spectral components. We put
its founding assumptions on firmer ground and we provide a detailed derivation
for its main analytical results. We then carry out an extensive simulative
validation by addressing an ample and significant set of formats encompassing
PM-BPSK, PM-QPSK, PM-8QAM, and PM-16QAM, all operating at 32 GBaud. We compare
the model prediction of maximum system reach and optimum launch power versus
simulation results, for all four formats, three different kinds of fibers
(PSCF, SMF, and NZDSF) and for several values of WDM channel spacing, ranging
from 50 GHz down to the symbol-rate. We found that, throughout all tests,
the model delivers accurate predictions, potentially making it an effective
general-purpose system design tool for coherent uncompensated
transmission systems.
© 2012 IEEE
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