Zou Weiwen, Long Xin, Li Xing, Xin Guangyao, Chen Jianping
Opt Lett. 2019 Apr 15;44(8):2045-2048. doi: 10.1364/OL.44.002045.
We demonstrate an arbitrary-response Brillouin instantaneous frequency measurement (IFM) based on the principle of the frequency-to-power mapping in stimulated Brillouin scattering (SBS), which is named Brillouin IFM. The arbitrary response is realized by periodically sweeping the frequency of the local pump lightwave, and the response's amplitude depends on the sweeping slope. The Brillouin IFM is achieved by the control of the sweeping period lower than the double of the flight-of-time in the SBS interaction length. A Costas frequency coded pulse is experimentally measured to verify the feasibility of the proposed Brillouin IFM scheme. The bandwidth of the digital sampling in the scheme is reduced to 50 MHz. The Brillouin IFM range without averaging reaches 6 GHz at Ku band.
我们基于受激布里渊散射（SBS）中的频率 - 功率映射原理演示了一种任意响应布里渊瞬时频率测量（IFM），其被命名为布里渊IFM。通过周期性地扫描本地泵浦光波的频率来实现任意响应，并且响应的幅度取决于扫描斜率。通过将扫描周期控制为低于SBS相互作用长度中飞行时间的两倍来实现布里渊IFM。通过实验测量了科斯塔斯频率编码脉冲，以验证所提出的布里渊IFM方案的可行性。该方案中数字采样的带宽降低到了50 MHz。在Ku波段，无需平均的布里渊IFM范围达到了6 GHz。
