title: Highly stable wideband microwave extraction by synchronizing widely tunable optoelectronic oscillator with optical frequency comb.
abstract: Optical frequency combs (OFCs), based on mode-locked lasers (MLLs), have attracted considerable attention in many fields over recent years. Among the applications of OFCs, one of the most challenging works is the extraction of a highly stable microwave with low phase noise. Many synchronisation schemes have been exploited to synchronise an electronic oscillator with the pulse train from a MLL, helping to extract an ultra-stable microwave. Here, we demonstrate novel wideband microwave extraction from a stable OFC by synchronising a single widely tunable optoelectronic oscillator (OEO) with an OFC at different harmonic frequencies, using an optical phase detection technique. The tunable range of the proposed microwave extraction extends from 2 GHz to 4 GHz, and in a long-term synchronisation experiment over 12 hours, the proposed synchronisation scheme provided a rms timing drift of 18 fs and frequency instabilities at 1.2 × 10(-15)/1 s and 2.2 × 10(-18)/10,000 s.
authors: Department of Electronics, Peking University, Beijing 100871, China, State Key Laboratory of Advanced Optical Communication Systems and Networks, Peking University, Beijing 100871, China.
authors: D
authors: D
authors: Hou
authors: Department of Electronics, Peking University, Beijing 100871, China, State Key Laboratory of Advanced Optical Communication Systems and Networks, Peking University, Beijing 100871, China.
authors: X P
authors: XP
authors: Xie
authors: Department of Electronics, Peking University, Beijing 100871, China, State Key Laboratory of Advanced Optical Communication Systems and Networks, Peking University, Beijing 100871, China.
authors: Y L
authors: YL
authors: Zhang
authors: Department of Electronics, Peking University, Beijing 100871, China, State Key Laboratory of Advanced Optical Communication Systems and Networks, Peking University, Beijing 100871, China.
authors: J T
authors: JT
authors: Wu
authors: Department of Electronics, Peking University, Beijing 100871, China, State Key Laboratory of Advanced Optical Communication Systems and Networks, Peking University, Beijing 100871, China.
authors: Z Y
authors: ZY
authors: Chen
authors: Department of Electronics, Peking University, Beijing 100871, China, State Key Laboratory of Advanced Optical Communication Systems and Networks, Peking University, Beijing 100871, China.
authors: J Y
authors: JY
authors: Zhao