The rapid development of radar technology requires RF transmitters with high working frequency, broad tuning bandwidth, flexible reconfigurability, and the ability of generating large time-bandwidth product signals. In this paper, we reviewed the main architecture and research status of high-frequency, broadband, multi-format radar waveform generation technology based on optical frequency combs (OFCs) in the context of microwave photonics, and we highlighted the technical route and the main problems that exist for the purpose of practical engineering applications. The main challenges and development trends of microwave photonic radar RF front-end based on optical frequency comb in future applications are also presented.
A new type of electro-optic crystal (PIN-PMN-PT) has been discovered. It has similar transmission wavelength range and transmittance with the traditional lithium niobate crystal. It has higher electro-optic coefficient and refractive index than lithium niobate crystal. We used this material to make a disk-shaped whispering gallery structure and studied it.
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