Abstract
A new high-resolution tunable RF/microwave photonic notch filter with
low-noise performance is presented. It is based on using a dual-input electro-optic
intensity modulator together with a frequency-shifting amplified recirculating
delay line loop. It can realize a very narrow notch, and also a wide and flat
passband to simultaneously excise interference with minimal impact on the
wanted signal. The notch filter can be integrated into optical fibre microwave
transmission systems. Experimental results are presented which demonstrate
a notch filter response with a very narrow notch width of 0.55% of the filter
free spectral range, a wide and flat passband, and a high signal-to-noise
ratio of 114 dB/Hz. The ability to tune the notch frequency of the filter
is also demonstrated.
© 2011 IEEE
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