Abstract
A microwave photonic filter (MPF) with reconfigurability and tunability resulting from the
superposition of the transfer functions is proposed. Based on the Vernier effect between the optical frequency
combs and the periodic optical filters, each comb line can be mapped into a sub-filter in the electronic
field. The sub-filters are superposed to obtain the total transfer function of the MPF. By manipulating a few
comb lines, we can reconfigure the passband shape, tune the bandwidth, and adjust the center frequency
independently. Experiments verify that the bandwidth can be tuned from 224.8 to 674.3 MHz, and that the center
frequency ranges from 1 to 4 GHz.
© 2013 Chinese Optics Letters
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