Low-noise microwave generation is crucial for advanced applications such as 6G millimeter-wave communica-tions,satellite communications,and synthetic aperture radar systems.Traditional microwave sources encounter chal...Low-noise microwave generation is crucial for advanced applications such as 6G millimeter-wave communica-tions,satellite communications,and synthetic aperture radar systems.Traditional microwave sources encounter challenges in meeting stringent performance requirements while maintaining low size,weight,and power con-sumption(SWaP)at ever-increasing high frequencies.Photonic microwave generation is a promising solution to overcome these limitations,particularly when implemented with chip-scale integration using a simple yet efficient architecture.Here,we propose a chip-scale integrated photonic microwave generator(IPMG)scheme that features a low-noise hybrid InP/Si_(3)N_(4)comb laser based on the self-injection locking mechanism,in conjunction with the optic-electro-optic feedback to further enhance the RF generation performance.The proof-of-concept IPMG prototype has demonstrated superior performance,highlighting an ultra-narrow RF intrinsic linewidth of 0.8 Hz,low single-sideband phase noises of-92.1 dBc/Hz at 10 kHz offset and-128.3 dBc/Hz at 1 MHz offset,and excellent frequency stability with only 16 kHz fluctuations over 5 min.This work marks a substantial advancement in the development of fully integrated photonic microwave generators by unifying good perfor-mance,architectural simplicity,and low SWaP.展开更多
基金National Natural Science Foundation of China(U22A6004)Pengcheng Laboratory-China Mobile Scientific and Technological Innovation Fund(2024ZY2A0020).
文摘Low-noise microwave generation is crucial for advanced applications such as 6G millimeter-wave communica-tions,satellite communications,and synthetic aperture radar systems.Traditional microwave sources encounter challenges in meeting stringent performance requirements while maintaining low size,weight,and power con-sumption(SWaP)at ever-increasing high frequencies.Photonic microwave generation is a promising solution to overcome these limitations,particularly when implemented with chip-scale integration using a simple yet efficient architecture.Here,we propose a chip-scale integrated photonic microwave generator(IPMG)scheme that features a low-noise hybrid InP/Si_(3)N_(4)comb laser based on the self-injection locking mechanism,in conjunction with the optic-electro-optic feedback to further enhance the RF generation performance.The proof-of-concept IPMG prototype has demonstrated superior performance,highlighting an ultra-narrow RF intrinsic linewidth of 0.8 Hz,low single-sideband phase noises of-92.1 dBc/Hz at 10 kHz offset and-128.3 dBc/Hz at 1 MHz offset,and excellent frequency stability with only 16 kHz fluctuations over 5 min.This work marks a substantial advancement in the development of fully integrated photonic microwave generators by unifying good perfor-mance,architectural simplicity,and low SWaP.
