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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...
We demonstrate thermo-optically tunable multiple-channel micro-ring resonators as an ultra-compact on-chip spectral shaper, and tunable multiple-ring all-pass filters as variable delay lines for photonic radio-frequency waveform generation. High quality radio-frequency pulsed signals were achieved.
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