Abstract
New high-order microring filter architectures based on the coupling between counterpropagating modes in the
microring resonators are proposed and analyzed. The dual-mode nature of the resonators is exploited to maximize the
spectral response order, thereby enabling novel reflection filters to be realized with a superior performance than
conventional single-mode microring filters in terms of flat passband and steep skirt rolloff. Filter topologies for
two general classes of devices, the serial and parallel reflection filters, will be presented along with general
techniques for synthesizing their spectral responses. It is shown that a serial reflection filter consisting of N microring resonators can realize a filter response order of
up to 2(N - 1), while the parallel reflection type can be used
to realize "superflat" filters, which exhibit a much flatter bandpass response than conventional
maximally flat filters having the same number of cavities.
© 2007 IEEE
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