title: Photonic generation of phase-stable and wideband chirped microwave signals based on phase-locked dual optical frequency combs.
abstract: A photonics-based scheme is presented for generating wideband and phase-stable chirped microwave signals based on two phase-locked combs with fixed and agile repetition rates. By tuning the difference of the two combs' repetition rates and extracting different order comb tones, a wideband linearly frequency-chirped microwave signal with flexible carrier frequency and chirped range is obtained. Owing to the scheme of dual-heterodyne phase transfer and phase-locked loop, extrinsic phase drift and noise induced by the separated optical paths is detected and suppressed efficiently. Linearly frequency-chirped microwave signals from 5 to 15 GHz and 237 to 247 GHz with 30 ms duration are achieved, respectively, contributing to the time-bandwidth product of 3×108. And less than 1.3×10-5linearity errors (RMS) are also obtained.
authors: Yitian
authors: Y
authors: Tong
authors: Qian
authors: Q
authors: Zhou
authors: Daming
authors: D
authors: Han
authors: Baiyu
authors: B
authors: Li
authors: Weilin
authors: W
authors: Xie
authors: Zhangweiyi
authors: Z
authors: Liu
authors: Jie
authors: J
authors: Qin
authors: Xiaocheng
authors: X
authors: Wang
authors: Yi
authors: Y
authors: Dong
authors: Weisheng
authors: W
authors: Hu