A Photonically Enabled Compact 0.5–28.5 GHz RF Scanning Receiver
A Photonically Enabled Compact 0.5–28.5 GHz RF Scanning Receiver
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DOI：
10.1109/jlt.2018.2792304
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发表时间：
2018-05
影响因子：
4.7
通讯作者：
D. Onori;F. Scotti;F. Laghezza;M. Bartocci;A. Zaccaron;A. Tafuto;A. Albertoni;A. Bogoni;P. Ghelfi
中科院分区：
文献类型：
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作者：
D. Onori;F. Scotti;F. Laghezza;M. Bartocci;A. Zaccaron;A. Tafuto;A. Albertoni;A. Bogoni;P. Ghelfi
提出并演示了一种创新且有效的基于光子学的射频（RF）频谱扫描仪，可在0.5-28.5 GHz范围内进行检测。所提出的接收器以离散步骤扫描整个频率范围，在基带检测频谱的单个部分下变频，在那里它们可以精确地获取，而不使用射频带通滤波器或光学滤波器。宽带扫描是通过简单地调整光载波实现的，避免了使用射频合成器或多个并行本地振荡器。更详细地说，光载波被检测到的射频信号通过电光调制器调制，并与光学本振进行光混合，将调制边带下转换为基带。该光载波还馈入一个由固定射频振荡器驱动的光频梳发生器，其输出注入本振。这样，光载波和振荡器是锁相的，可以在1ghz的步长上调谐。开发的演示器实现了高达28.5 GHz的输入范围，仿真分析表明，使用商用设备的能力超过了0.5-40 GHz的范围。此外，它显示出160 dB/Hz的线性动态范围和109 dB/Hz2/3的无杂散动态范围，与最先进的宽带射频接收器一致。拟议的解决方案似乎满足了要求苛刻的电子支持措施应用的性能要求，并有可能大大减少接收器的尺寸。
An innovative and effective photonics-based radio frequency (RF) spectrum scanner is presented and demonstrated, enabling the detection in the 0.5–28.5 GHz range. The proposed receiver scans the whole frequency range at discrete steps, down-converting at baseband single portions of the detected spectrum, where they can be precisely acquired, without using RF bandpass filters nor optical filters. The wideband scansion is achieved by simply tuning an optical carrier only, avoiding the use of an RF synthesizer or of multiple parallel local oscillators. In more detail, the optical carrier is modulated by the detected RF signal through an electro-optical modulator, and photomixed with an optical local oscillator to down-convert the modulation sideband to baseband. The optical carrier also feeds an optical frequency comb generator—driven by a fixed RF oscillator at 1 GHz—whose output injects the local oscillator. This way, the optical carrier and oscillator are phase locked and can be tuned at steps of 1 GHz. The developed demonstrator achieves an input range up to 28.5 GHz, and a simulative analysis suggests the capability of exceeding the 0.5–40 GHz range employing commercially available devices. Moreover, it shows a linear dynamic range of 160 dB/Hz and a spuriousfree dynamic range of 109 dB/Hz2/3 , aligned with the state-of-the-art broadband RF receivers. The proposed solution appears to fulfill the performance requirements of the demanding electronic support measures applications, with the potentials for largely reducing the receiver size.