Abstract An ultra-wideband measurement for arbitrary optical magnitude response is proposed and experimentally demonstrated by using optical carrier-suppressed double sideband modulation and fixed low-frequency detection. Compared with previous optical single sideband modulation-based methods, the proposed scheme doubles the measurement range. Moreover, the response can be detected at a fixed low frequency by incorporating microwave photonic frequency down-conversion. The proposed approach has the merit of measuring arbitrary response avoiding high-speed and wideband detectors. To verify the concept, simulation and experiment are carried out. The magnitude responses of two fiber Bragg gratings, which have bandwidths of 19.8 GHz and 67 GHz, are characterized with a resolution of 10 MHz by using a 43.5 GHz microwave signal source.

中文翻译：

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使用双边带调制和低频检测对任意频谱响应进行超宽带测量

摘要 提出了一种任意光幅度响应的超宽带测量方法，并通过使用光载波抑制双边带调制和固定低频检测进行了实验验证。与以前基于光单边带调制的方法相比，所提出的方案使测量范围加倍。此外，通过结合微波光子频率下变频，可以在固定的低频下检测响应。所提出的方法具有测量任意响应的优点，避免了高速和宽带检测器。为了验证该概念，进行了仿真和实验。两个光纤布拉格光栅的幅度响应具有 19.8 GHz 和 67 GHz 的带宽，通过使用 43.5 GHz 微波信号源具有 10 MHz 的分辨率。