Abstract
We propose and experimentally demonstrate a scheme of high-Q microwave
photonic filter (MPF) using the techniques of self-phase modulation (SPM) spectrum
broadening and third-order dispersion (TOD) compensation. The optical pulses from a
mode-locking laser are spectrally broadened by the SPM in the highly nonlinear
fiber. A wideband optical frequency comb with 365 spectral lines within 10-dB power
variation from the highest spectral power is obtained. By applying a cubic phase
modulation via a waveshaper, the effect of TOD which broadens the MPF passband is
eliminated. The final implemented MPF has a Q-value as high as 296 and a tuning
range of 700 MHz.
© 2014 Chinese Optics Letters
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