Abstract
Microresonators with a high Kerr nonlinearity show great potential to generate optical frequency combs
with ultrabroad spectra, high repetition rate, and high coherence between comb lines. The compact size and possibility
of chip-level integration make the Kerr combs attractive for many applications, especially including photonic
radiofrequency (RF) filters. In this paper we report the first demonstration of a programmable photonic RF filter
based on the Kerr comb from a silicon nitride microring. A novel scheme enabled by the large frequency spacing of the
Kerr comb is introduced in order to suppress unwanted RF passbands including the image and periodic passbands. As a
result, a single passband is achieved. To the best of our knowledge, this is the first demonstration of a
single-bandpass photonic RF filter employing a discrete-wavelength comb source.
© 2014 IEEE
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