Qu Shaolin, Zhou Weinan, Zhou Yu, Dong Wei
Appl Opt. 2021 Aug 1;60(22):6554-6559. doi: 10.1364/AO.426368.
We propose a novel optoelectronic oscillator (OEO) based on stimulated Brillouin scattering (SBS) and a Mach-Zehnder interferometer (MZI). The SBS and MZI form a microwave photonic filter (MPF), which completes the frequency selection of the OEO. The width of the MPF passband can be changed by adjusting the DC voltage of the MZI. When the gap between the passbands is aligned with the side mode, the side mode can be suppressed; in this way, a single-mode optoelectronic oscillator is achieved. Compared with the previous structure, the proposed structure is more stable and easier to integrate. A stable frequency signal at 9.4 GHz is obtained with a phase noise of -84.05/ at 10 kHz, the side-mode-suppression ratio is 42 dB, and the frequency drift is below 50 kHz within 420 s. By adjusting the wavelength of the tunable laser source, a 280 MHz tuning range from 9.25 to 9.53 GHz is obtained. If an independent pump is introduced, a large tuning range is achieved from 9.4 to 24.9 GHz.
我们提出了一种基于受激布里渊散射（SBS）和马赫-曾德尔干涉仪（MZI）的新型光电振荡器（OEO）。SBS和MZI构成一个微波光子滤波器（MPF），它完成了OEO的频率选择。MPF通带的宽度可以通过调整MZI的直流电压来改变。当通带之间的间隙与边模对齐时，可以抑制边模；通过这种方式，实现了单模光电振荡器。与先前的结构相比，所提出的结构更稳定且更易于集成。获得了一个9.4 GHz的稳定频率信号，在10 kHz处的相位噪声为-84.05 dBc，边模抑制比为42 dB，并且在420 s内频率漂移低于50 kHz。通过调整可调谐激光源的波长，获得了从9.25到9.53 GHz的280 MHz调谐范围。如果引入一个独立的泵浦源，则可以实现从9.4到24.9 GHz的大调谐范围。
