Abstract
In this paper we show that, in hybrid wavelength division multiplexed
systems, the performance of high datatrate QPSK channels impaired by cross-phase
modulation (XPM) induced by the lower rate OOK channels can be simply estimated
by an extension of a well-known linear model for XPM, and novel analytical
expressions of the sensitivity penalty are provided. From such a model we
prove that the reported QPSK penalty decrease with QPSK baudrate increase
should be attributed to the action of the phase estimation process rather
than to the walkoff effect. The model also simply shows how coherent QPSK
is more affected by XPM than incoherent DQPSK, and allows to infer that even
more impact is expected when the baudrate is further reduced through polarization
multiplexing.
© 2009 IEEE
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