In modern radar system, pulse compression technique has been widely used to increase the detection distance andrange resolution. To enlarge the pulse compression ratio, the microwave signals are often phase modulated, such asphase-coded or frequency chirped. Conventionally, the phase-modulated microwave signals generated by electricalmethods suffer from low microwave carrier frequency, limited bandwidth, low data rate and high transmission loss.Photonic-assisted generation and transmission of phase-modulated signals is a promising candidate to overcome theselimitations In this paper, we review our recent works about the photonic generation and transmission of phase-modulatedmicrowave signals, including the simultaneously frequency up-conversion and phase-coding, background-freefrequency-doubled phase-coded microwave signal generation, phase-coded microwave pulse generator by optoelectronicoscillation (OEO), as well as transmission of dual-chirped microwave signals with chromatic-dispersion-induced powerfading (CDIP) compensation and elimination technology. These works represent the new progresses in photonicapproaches to generate and transmit phase-modulated microwave signals, which has great potential in the modern radarsystem.
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