Abstract
In this paper, we outline the design of signal processing (DSP) algorithms
with blind estimation for 100-G coherent optical polarization-diversity
receivers in single-carrier systems. As main degrading optical propagation
effects, we considered chromatic dispersion (CD), polarization-mode
dispersion (PMD), polarization-dependent loss (PDL), and cross-phase
modulation (XPM). In the context of this work, we developed algorithms to
increase the robustness of the single DSP receiver modules against the
aforesaid propagation effects. In particular, we first present a new and
fast algorithm to perform blind adaptive CD compensation through
frequency-domain equalization. This low complexity equalizer component
inherits a highly precise estimation of residual dispersion independent from
previous or subsequent blocks. Next, we introduce an original
dispersion-tolerant timing recovery and illustrate the derivation of blind
polarization demultiplexing, capable to operate also in condition of high
PDL. At last, we propose an XPM-mitigating carrier phase recovery as an
extension of the standard Viterbi–Viterbi algorithm.
© 2009 IEEE
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