Hao Tengfei, Tang Jian, Shi Nuannuan, Li Wei, Zhu Ninghua, Li Ming
Opt Lett. 2019 Apr 15;44(8):1912-1915. doi: 10.1364/OL.44.001912.
Optoelectronic oscillators (OEOs) have been widely investigated to generate ultra-pure single-frequency microwave signals. Here, we propose and experimentally demonstrate a dual-chirp Fourier domain mode-locked (FDML) OEO to generate dual-chip microwave waveforms. In the proposed FDML OEO, a frequency-scanning dual-passband microwave photonics filter based on phase-modulation-to-intensity-modulation conversion using an optical notch filter and two laser diodes is incorporated into the OEO cavity. Fourier domain mode-locking operation is achieved by synchronizing the scanning period of the filter to the cavity round-trip time. Tunable dual-chirp microwave waveforms with a large time-bandwidth product are generated directly from the FDML OEO cavity in the experiment, which can be used in modern radar systems to improve its range-Doppler resolution.
光电振荡器（OEO）已被广泛研究用于产生超纯单频微波信号。在此，我们提出并通过实验证明了一种双啁啾傅里叶域锁模（FDML）OEO，用于产生双芯片微波波形。在所提出的FDML OEO中，基于使用光学陷波滤波器和两个激光二极管的相位调制到强度调制转换的频率扫描双通带微波光子滤波器被并入OEO腔中。通过使滤波器的扫描周期与腔往返时间同步来实现傅里叶域锁模操作。实验中直接从FDML OEO腔产生具有大时间带宽积的可调谐双啁啾微波波形，其可用于现代雷达系统以提高其距离 - 多普勒分辨率。
