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Photonics-based interference mitigation filters

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3 Author(s)
Minasian, R.A. ; Sch. of Electr. & Inf. Eng., Sydney Univ., NSW, Australia ; Alameh, K.E. ; Chan, E.H.W.

New photonic filter structures for interference mitigation of microwave signals are presented. These fiber filters have a parallel topology, and comprise a grating based photonic bandpass filter, or a dual offset cavity structure based on a new noncommensurate delay-line approach. The new topologies overcome the problem of synthesizing both a narrow stopband and a very-wide and flat passband, to simultaneously excise interference with minimal impact on the wanted signal over a wide microwave range. Results demonstrate stopbands of around 1% of center frequency, wide-band flat transmission, and a shape factor of 10.5 that is the lowest reported for a photonic notch filter, in excellent agreement with predictions

Published in:

Microwave Theory and Techniques, IEEE Transactions on  (Volume:49 ,  Issue: 10 )