Geng Jihong, Staines Sean, Jiang Shibin
NP Photonics, Inc., 9030 S. Rita Road, Tucson, Arizona 85747, USA.
Opt Lett. 2008 Jan 1;33(1):16-8. doi: 10.1364/ol.33.000016.
We demonstrate a new approach, i.e., a cw dual-frequency Brillouin fiber laser pumped by two independent single-frequency Er-doped fiber lasers, for the generation of tunable low-noise rf/microwave optical signals. Its inherent features of both linewidth narrowing effect in a Brillouin fiber cavity and common mode noise cancellation between two laser modes sharing a common cavity allow us to achieve high frequency stability without using a supercavity. Beat frequency of the dual-frequency Brillouin fiber laser can be tuned from tens of megahertz up to 100 GHz by thermally tuning the wavelengths of the two pump lasers with tuning sensitivity of approximately 1.4 GHz/ degrees C. Allan variance measurements show the beat signals have the hertz-level frequency stability.
我们展示了一种新方法，即由两个独立的单频掺铒光纤激光器泵浦的连续波双频布里渊光纤激光器，用于产生可调谐的低噪声射频/微波光信号。其在布里渊光纤腔中的线宽变窄效应以及共享同一腔的两个激光模式之间的共模噪声消除的固有特性，使我们无需使用超腔就能实现高频稳定性。通过热调谐两个泵浦激光器的波长，双频布里渊光纤激光器的拍频可从几十兆赫兹调谐到100吉赫兹，调谐灵敏度约为1.4吉赫兹/摄氏度。阿伦方差测量表明拍频信号具有赫兹级的频率稳定性。
