论文标题
通过扩大过滤器带宽来打破过滤器和频率映射的时间和频率获取方法的准确性和分辨率限制
Breaking the accuracy and resolution limitation of filter- and frequency-to-time mapping-based time and frequency acquisition methods by broadening the filter bandwidth
论文作者
论文摘要
在本文中，全面分析了基于光子学的时间和频率映射（FTTM）的光子学辅助时间和频率采集方法，并通过扩大过滤器带宽来打破快速扫描方案中的准确性和分辨率限制。发现当扫描速度非常快时，通过FTTM生成的脉冲的宽度主要取决于过滤器的脉冲响应。在这种情况下，适当增加过滤器带宽可以显着降低脉冲宽度，以提高测量精度和分辨率。通过比较有或没有SBS增益频谱扩大的结果，可以很好地证明基于FTTM的短时傅立叶变换（STFT）和微波频率测量，并通过比较有或没有SBS增益频谱扩大的结果来证明，并提高了测量精度和频率分辨率的提高。与以前的扫描速度相比，与以前的工作相比，系统的频率测量精度提高了25倍，而与以前的结果相比，STFT的频率分辨率也得到了很大提高。
In this paper, the filter- and frequency-to-time mapping (FTTM)-based photonics-assisted time and frequency acquisition methods are comprehensively analyzed and the accuracy and resolution limitation in the fast sweep scenario is broken by broadening the filter bandwidth. It is found that when the sweep speed is very fast, the width of the generated pulse via FTTM is mainly determined by the impulse response of the filter. In this case, appropriately increasing the filter bandwidth can significantly reduce the pulse width, so as to improve the measurement accuracy and resolution. FTTM-based short-time Fourier transform (STFT) and microwave frequency measurement using the stimulated Brillouin scattering (SBS) effect is demonstrated by comparing the results with and without SBS gain spectrum broadening and the improvement of measurement accuracy and frequency resolution is well confirmed. The frequency measurement accuracy of the system is improved by around 25 times compared with the former work using a similar sweep speed, while the frequency resolution of the STFT is also much improved compared with our former results.
