中文摘要：

提出基于8字型结构布里渊多波长光纤激光器的可调谐高频微波的产生方法,该结构耦合输出奇次阶斯托克斯光,从而实现间隔约为20GHz或0.16nm的双波长激光信号输出,第一阶斯托克斯光和第三阶斯托克斯光功率变化在±0.35dB以内。双波长激光信号通过外差的方式进入高速光电探测器产生21.39GHz的微波信号,所得到微波信号的信噪比约为20dB,通过拟合得到3dB线宽约为2MHz,微波信号功率变化在±0.75dB以内。并对比抽运光和第二阶斯托克斯光拍频的微波信号线宽,线宽约为2 MHz。通过调节抽运光的波长实现了微波信号可调谐,范围为±0.28GHz。实验结果说明,所提结构可实现近20GHz的可调谐微波信号,对进一步提高微波信号的质量进行了分析。

英文摘要：

A simple photonic approach to generate tunable microwave signal with a Brillouin fiber ring laser in a figure of eight configuration is proposed and experimentally demonstrated. A dual wavelength optical signal with about 20 GHz or 0.16 nm frequency spacing is achieved by removing the odd-order Stokes lines. The power variation of the first order Stokes and third order Stokes is less than ±0.35 dB. The optical signal is heterodyned at the high speed photodetector （PD） to produce a 21. 39 GHz microwave signal. The signal-to-noise rate （SNR） of the microwave signal is about 20 dB. The 3 dB linewidth is estimated as 2 MHz. The power variation of microwave signal is less than 20.75 dB. 3 dB linewidth of microwave signal is also about 2 MHz by beating Brillouin pump and the second order Stokes. Tunable microwave signal under ± 0.28 GHz can be obtained by adjusting the wavelength of pump laser. -20 GHz tunable microwave signal can be achieved by the proposed scheme, and the result can be used to improved microwave signal in future.