Linearly chirped microwave waveforms(LCMWs)are indispensable in advanced radar systems.Our study introduces and validates,through extensive experimentation,the innovative application of a thin-film lithium niobate(TFL...Linearly chirped microwave waveforms(LCMWs)are indispensable in advanced radar systems.Our study introduces and validates,through extensive experimentation,the innovative application of a thin-film lithium niobate(TFLN)photonic integrated circuit(PIC)to realize a Fourier domain mode-locked optoelectronic oscillator(FDML OEO)for generating high-precision LCMW signals.This integrated chip combines a phase modulator(PM)and an electrically tuned notch micro-ring resonator(MRR),which functions as a rapidly tunable bandpass filter,facilitating the essential phase-to-intensity modulation(PM-IM)conversion for OEO oscillation.By synchronizing the modulation period of the applied driving voltage to the MRR with the OEO loop delay,we achieve Fourier domain mode-locking,producing LCMW signals with an impressive tunable center frequency range of18.55 GHz to 23.59 GHz,an adjustable sweep bandwidth from 3.85 GHz to 8.5 GHz,and a remarkable chirp rate up to 3.22 GHz/μs.Unlike conventional PM-IM based FDML OEOs,our device obviates the need for expensive tunable lasers or microwave sources,positioning it as a practical solution for generating high-frequency LCMW signals with extended sweep bandwidth and high chirp rates,all within a compact and cost-efficient form factor.展开更多
基金Natural Science Foundation of Hebei Province(F2024201002)Interdisciplinary Research Program of Natural Science of Hebei University(DXK202204)Research Start-up Foundation of High-Level Talents Introduction(8012605)。
文摘Linearly chirped microwave waveforms(LCMWs)are indispensable in advanced radar systems.Our study introduces and validates,through extensive experimentation,the innovative application of a thin-film lithium niobate(TFLN)photonic integrated circuit(PIC)to realize a Fourier domain mode-locked optoelectronic oscillator(FDML OEO)for generating high-precision LCMW signals.This integrated chip combines a phase modulator(PM)and an electrically tuned notch micro-ring resonator(MRR),which functions as a rapidly tunable bandpass filter,facilitating the essential phase-to-intensity modulation(PM-IM)conversion for OEO oscillation.By synchronizing the modulation period of the applied driving voltage to the MRR with the OEO loop delay,we achieve Fourier domain mode-locking,producing LCMW signals with an impressive tunable center frequency range of18.55 GHz to 23.59 GHz,an adjustable sweep bandwidth from 3.85 GHz to 8.5 GHz,and a remarkable chirp rate up to 3.22 GHz/μs.Unlike conventional PM-IM based FDML OEOs,our device obviates the need for expensive tunable lasers or microwave sources,positioning it as a practical solution for generating high-frequency LCMW signals with extended sweep bandwidth and high chirp rates,all within a compact and cost-efficient form factor.
