  We report a novel class microwave photonic (MWP) notch filter with a very
narrow isolation bandwidth (10 MHz), an ultrahigh stopband rejection (> 60 dB),
a wide frequency tuning (1-30 GHz), and flexible bandwidth reconfigurability
(10-65 MHz). This record performance is enabled by a new concept of sidebands
amplitude and phase controls using an electro-optic modulator and an optical
filter. This new concept enables energy efficient operation in active MWP notch
filters, and opens up the pathway to enable low-power nanophotonic devices as
high performance RF filters.
