研究目的
Review key problems in microresonator frequency comb generation for RF photonic applications and demonstrate preliminary results based on mode-locked and low-noise Kerr combs.
研究成果
Microcombs have shown great potentials for RF photonics, with preliminary systems including complex-tap signal processing and true-time-delay beamforming demonstrated. Future research should focus on microcomb generation with extraordinarily low noise and high efficiency for RF photonic applications.
研究不足
The study notes that the number of comb lines decreases with larger line spacing for a given spectral range, requiring a trade-off between comb line spacing and usable line number in practical applications. The frequency response of a discrete-delay-line filter is periodic, imposing a limitation on the maximum RF frequency that can be processed.
1：Experimental Design and Method Selection:
The study reviews microresonator frequency comb generation, focusing on comb intensity noise and power conversion efficiency. It demonstrates preliminary results using mode-locked and low-noise Kerr combs for programmable complex-tap signal processing and true-time-delay beamforming.
2：Sample Selection and Data Sources:
Silicon nitride (SiN) microring resonators are used for comb generation, with microheaters fabricated for thermal tuning and control.
3：List of Experimental Equipment and Materials:
Silicon nitride microring resonators, microheaters, single mode fiber, optical spectral shaper, MEMs optical switches.
4：Experimental Procedures and Operational Workflow:
The setup includes a complex-tap RF photonic filter based on a mode-locked dark pulse microcomb and a microcomb based RF photonic true-time-delay beamformer. The process involves introducing differential time delays between comb lines and using spectral shaping for filter and beam pattern control.
5：Data Analysis Methods:
The study analyzes the frequency response of the RF photonic filter and the beam patterns of the beamformer, focusing on noise figure, spurious-free dynamic range, and conversion loss.
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