Abstract
We present a fully tunable multistage narrowband optical pole-zero notch
filter that is fabricated in a silicon complementary metal oxide semiconductor
(CMOS) foundry. The filter allows for the reconfigurable and independent tuning
of the center frequency, null depth, and bandwidth for one or more notches
simultaneously. It is constructed using a Mach–Zehnder interferometer
(MZI) with cascaded tunable all-pass filter (APF) ring resonators in its arms.
Measured filter nulling response exhibits ultranarrow notch 3 dB BW of 0.6350
GHz, and nulling depth of 33 dB. This filter is compact and integrated in
an area of 1.75$~$mm$^{2}$. Using this device, a novel method to cancel undesired bands of
3 dB bandwidth of $<\,$910 MHz in microwave-photonic systems is demonstrated. The ultranarrow
filter response properties have been realized based on our developed low-propagation
loss silicon channel waveguide and tunable ring-resonator designs. Experimentally,
they yielded a loss of 0.25 dB/cm and 0.18 dB/round trip, respectively.
© 2009 IEEE
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