Photonic signal processing is a suitable alternative of electronics based processing for wideband frequency detection. We propose a novel technique for the detection of a wide range of frequencies based on photonic signal processing. The unknown frequency to be measured is used to modulate a tunable optical source by implementing single sideband suppressed carrier modulation. The modulated signal is combined with two fixed frequency optical carriers to perform heterodyne detection. The frequency of the tunable laser source is swept until significant power of the beat signal is observed after photodetection. A mathematical expression is presented that can be used to measure the frequency of the unknown electrical signal based on value of the center frequency of tunable laser source. The effect of increasing laser linewidth up to 100 MHz and instantaneous shift in laser center frequency up to 200 MHz has also been demonstrated. It has been shown that the proposed technique can measure almost any radio frequency by simply varying the frequency of the tunable laser source.

中文翻译：

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基于光子信号处理的新型宽带射频测量

光子信号处理是用于宽带频率检测的基于电子的处理的合适替代方案。我们提出了一种基于光子信号处理的宽范围频率检测的新技术。通过实现单边带抑制载波调制，将要测量的未知频率用于调制可调谐光源。调制信号与两个固定频率的光载波相结合，以执行外差检测。扫描可调谐激光源的频率，直到在光检测之后观察到拍信号的显着功率为止。提出了一种数学表达式，该表达式可用于基于可调激光源的中心频率值来测量未知电信号的频率。还已经证明了将激光线宽增加到100 MHz以及将激光中心频率的瞬时偏移增加到200 MHz的效果。已经表明，所提出的技术可以通过简单地改变可调激光源的频率来测量几乎任何射频。