Abstract
In this paper, the impact of the simultaneous presence of input and
add signals in add/drop filters realized with microring resonators is numerically
investigated. It is shown that the notch spectral response of output ports
is responsible for the intraband crosstalk appearing on the dropped signals
in add/drop operation. The investigation of the filter performance is performed
with modulated signals at both the input and the add port. The analysis highlights
the strong competition between the levels of induced intraband crosstalk and
the wavelength selectivity at high bit rate add/drop operation, even in higher
order filters. Multistage add/drop topologies that address the inefficiencies
of the single-stage add/drop filters are proposed, and successful operation
at 40 Gbps nonreturn to zero and return to zero signals is numerically demonstrated.
© 2009 IEEE
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