High-precision Microwave Frequency Measurement Based on Stimulated Brillouin Scattering With Simple Configuration
High-precision Microwave Frequency Measurement Based on Stimulated Brillouin Scattering With Simple Configuration
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基于受激布里渊散射的高精度微波频率测量，配置简单
DOI：
10.1109/jlt.2022.3167853
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发表时间：
2022-07
影响因子：
4.7
通讯作者：
Junqiang Sun
中科院分区：
文献类型：
--
作者：
Wenting Jiao;Qiang Huang;Chukun Huang;Haotian Shi;Junqiang Sun
提出并实现了一种基于受激布里渊散射（SBS）和切趾光纤布拉格光栅（AFBG）的微波频率测量（MFM）方案，该方案以高度简化的结构实现了大范围的高精度测量。通过在SBS过程中扫描参考频率，建立了参考频率与MFM系统的监测输出光功率之间的频率-功率映射。未知频率可以通过未知频率、参考频率和布里渊频移（BFS）之间的特定数字关系来识别。利用AFBG的透射和反射特性，同时为SBS过程提供泵浦光和探测光，从而降低了MFM系统的复杂性。从理论上可以推导出，除了3/2 BFS之外，所有大于1 BFS的频率都可以被测量。利用两段具有不同BFS的单模光纤可以消除这种测量盲点。在所提出的MFM方法的概念验证实验中，在10.68 GHz至20 GHz范围内实现了小于±1 MHz的测量误差。该方法也被证明适用于微波双频测量。
We propose and implement a microwave frequency measurement (MFM) scheme based on stimulated Brillouin scattering (SBS) and an apodized fiber Bragg grating (AFBG), achieving high accuracy in a wide range of measurement with a highly simplified configuration. By sweeping a reference frequency during SBS process, a frequency-to-power mapping between the reference frequency and the monitored output optical power of the MFM system is established. Unknown frequencies can be identified through a specific numerical relationship among the unknown frequency, reference frequency, and Brillouin frequency shift (BFS). The transmission and reflection properties of the AFBG are exploited to offer pump light and probe light simultaneously for SBS process, thereby reducing complexity of the MFM system. It can be derived theoretically that all frequencies larger than one BFS can be measured except for 3/2 BFS. This measurement blind spot can be eliminated by utilizing two segments of single-mode fibers with different BFSs. A measurement error of less than ±1 MHz within 10.68 GHz to 20 GHz is achieved in a proof-of-concept experiment of the proposed MFM approach. This method has also been proved to be applied to dual microwave frequency measurements.