Abstract
We present a comprehensive design, fabrication, and characterization analysis of compact
silicon-on-insulator bandpass filters with widely tunable bandwidth. The filter architecture is based on an unbalanced
Mach–Zehnder interferometer loaded with a pair of ring resonators. A wide bandwidth tunability (from 10%
to 90% FSR) can be achieved by controlling the resonant frequency of the rings while preserving a good filter
off-band rejection. Design rules are provided that take into account fabrication tolerances as well as losses.
Furthermore, the use of tunable couplers allows a more flexible shaping of the spectral response of the filter. The
sensitivity with respect to nonlinear effects is carefully investigated. Operation over a wavelength spectrum of
${20} \ {\rm n}{\rm m}$
is demonstrated, making the device
suitable for channel subset selection in WDM systems, reconfigurable filters for gridless networking and adaptive
filtering of signals.
© 2013 IEEE
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