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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。
A tunable high-frequency microwave generation method based on a 8-shaped Brillouin multi-wavelength fiber laser is proposed. The structure couples the odd order Stokes light to realize a dual-wavelength laser signal with an interval of about 20 GHz or 0.16 nm Output, first-order Stokes light and third-order Stokes optical power changes within ± 0.35dB. The dual-wavelength laser signal enters the high-speed photodetector to generate 21.39GHz microwave signal through heterodyne. The signal-to-noise ratio of the microwave signal is about 20dB. The 3dB line width is about 2MHz through the fitting. The power of the microwave signal changes within ± 0.75dB or less. And compared with the pump light and second-order Stokes light beat microwave signal line width, line width of about 2 MHz. The microwave signal is tunable by adjusting the wavelength of the pump light and has a range of ± 0.28 GHz. Experimental results show that the proposed structure can achieve nearly 20GHz tunable microwave signal, to further improve the quality of microwave signals were analyzed.