Jia Qingsong, Zhang Peng, Wang Tianshu, Li Xiaoyan, Bo Baoxue
Appl Opt. 2017 Jul 1;56(19):5323-5328. doi: 10.1364/AO.56.005323.
A novel approach to generating 40 GHz narrow linewidth frequency-switched microwave signals is proposed and demonstrated. In this scheme, a single-longitudinal-mode (SLM) double-Brillouin-frequency spaced Brillouin fiber laser with dual-ring configuration and unpumped erbium-doped fiber (EDF) is used to generate dual-wavelength lasers, and a fiber Bragg grating is used to select the laser for different Brillouin frequency spacings. Dual-ring configuration and unpumped EDF are designed to select the mode for the SLM laser. Dual-wavelength lasers are inserted into a photodetector, and microwave signals at 10.66, 21.39, 32.12, or 42.85 GHz can be obtained. The linewidth of the generated microwave signals is less than 69 kHz. The frequency drift at each frequency is less than 0.83 MHz. The frequency noise and linewidth of Stokes signals are measured, and the linewidth broadening effect of microwave signals is analyzed.
提出并演示了一种产生40GHz窄线宽频率切换微波信号的新方法。在该方案中，采用具有双环配置和未泵浦掺铒光纤（EDF）的单纵模（SLM）双布里渊频率间隔布里渊光纤激光器来产生双波长激光器，并使用光纤布拉格光栅来选择不同布里渊频率间隔的激光器。双环配置和未泵浦EDF用于选择SLM激光器的模式。将双波长激光器插入光电探测器中，可获得10.66、21.39、32.12或42.85GHz的微波信号。所产生微波信号的线宽小于69kHz。每个频率处的频率漂移小于0.83MHz。测量了斯托克斯信号的频率噪声和线宽，并分析了微波信号的线宽展宽效应。
