Abstract
In-band crosstalk, due to multiple interferers, has been identified as one
of the most severe impairments in optical transparent networks, especially
in the ones with a large number of nodes and a high wavelength density. Due
to its robustness to in-band crosstalk differential phase-shift keying
(DPSK) emerges as an attractive modulation scheme to be used in such
environments. This paper proposes a rigorous formulation to estimate the
performance of direct-detection DPSK receivers using an eigenfunction
expansion technique in the time domain. The method takes into account both
the in-band crosstalk, due to an arbitrary number of interfering terms, and
the amplified spontaneous emission noise and is able to deal with any
combination of optical and electrical filter shapes. Using this method the
accuracy of an approximation based on the wideband optical filtering
assumption was evaluated and shown that the approximation, although not
providing reliable results for the error probabilities, can be used with
confidence to compute power penalties due to in-band crosstalk. Furthermore,
the crosstalk tolerance of DPSK over on-off keying was quantified and shown
that this tolerance is reduced when the number of interferers
increases.
© 2010 IEEE
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