Norcia S, Tonda-Goldstein S, Dolfi D, Huignard J P, Frey R
Thales Research & Technology, Domaine de Corbeville, 91404 Orsay cedex, France.
Opt Lett. 2003 Oct 15;28(20):1888-90. doi: 10.1364/ol.28.001888.
We experimentally demonstrate efficient optical carrier reduction of microwave signals with a single-mode 1.5-microm wavelength Brillouin all-fiber ring laser. Because of the tunable optical coupling, the lasing threshold of the short-length (20-m) fiber cavity is lower than 5 mW, and high conversion efficiencies (up to 60%) are obtained at any pump power up to approximately 200 mW. Using the single-mode Stokes beam as a seed for the stimulated Brillouin scattering process allows up to 40-dB optical carrier depletion with almost no added noise for an optically carried microwave signal at 6 GHz. In addition, using this resonator, we provide evidence of generation of high-spectral-purity beatnotes.
我们通过一个单模1.5微米波长的布里渊全光纤环形激光器，通过实验证明了微波信号的高效光载波抑制。由于可调谐光耦合，短长度（20米）光纤腔的激光阈值低于5毫瓦，在高达约200毫瓦的任何泵浦功率下都能获得高转换效率（高达60%）。将单模斯托克斯光束用作受激布里渊散射过程的种子，对于6吉赫兹的光载微波信号，可实现高达40分贝的光载波耗尽，且几乎不增加噪声。此外，使用该谐振器，我们提供了产生高光谱纯度拍频的证据。
