Abstract
This paper provides new theoretical insights into the properties of direct
detection differential phase-shift keying (DPSK) signals impaired by
coherent and incoherent crosstalk. Coherent crosstalk is due to multiple
replicas originated while a data signal is routed through an optical
network, whereas the source of incoherent crosstalk resides on the
interference from other DPSK signals. A special emphasize has been put on
modeling the multipath coherent crosstalk, with analytical expressions being
derived and presented for both the moment generating function of the
decision variable and the average error probability. A rigorous analysis,
capable of dealing with arbitrary filtering, is also presented, which is
used afterwards to assess the accuracy of the analytical formulas. A
detailed comparison with incoherent crosstalk is also performed. Using also
an exact treatment for this type of crosstalk it is shown that for low OSNR
penalties the coherent crosstalk leads, in some circumstances, to slightly
worse results than the incoherent one, but this situation is reversed when
the total crosstalk level and the number of interferers increase.
© 2010 IEEE
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