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<p>In this paper, we propose a photonic-assisted instantaneous frequency measurement (IFM) scheme based on frequency-phase mapping, which features an adjustable measurement range and low error. In this IFM method, a linear frequency-phase mapping is established by leveraging the phase difference between two radio-frequency (RF) output signals. Prior to inputting the signal under test (SUT) into the two RF ports of the DP-DDMZM, it is transmitted through coaxial cables with differing lengths. The relative delay introduced between the two SUT signals in this process maps the SUT frequency information to the phase of the 1st order optical sideband. The measurement range of the system can be adjusted by modifying the time delay induced by the length difference of the coaxial cable between the two RF paths. This reconstruction process does not affect the measurement error and frequency resolution of the system, thereby achieving frequency measurements that are both flexible and highly accurate. Simulation results demonstrate that the proposed scheme has a frequency resolution of 10.092 kHz and achieves a low measurement error within ± 0.08 GHz across a wide frequency range from 8 to 50 GHz.</p>

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Low-error, adjustable measuring range photonic-assisted instantaneous frequency measurement scheme based on frequency-phase mapping

  • 期刊论文

  • 发表日期：

    2026年4月1日

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  • Ning Zhang,
  • Jianxin Ma

摘要

In this paper, we propose a photonic-assisted instantaneous frequency measurement (IFM) scheme based on frequency-phase mapping, which features an adjustable measurement range and low error. In this IFM method, a linear frequency-phase mapping is established by leveraging the phase difference between two radio-frequency (RF) output signals. Prior to inputting the signal under test (SUT) into the two RF ports of the DP-DDMZM, it is transmitted through coaxial cables with differing lengths. The relative delay introduced between the two SUT signals in this process maps the SUT frequency information to the phase of the 1st order optical sideband. The measurement range of the system can be adjusted by modifying the time delay induced by the length difference of the coaxial cable between the two RF paths. This reconstruction process does not affect the measurement error and frequency resolution of the system, thereby achieving frequency measurements that are both flexible and highly accurate. Simulation results demonstrate that the proposed scheme has a frequency resolution of 10.092 kHz and achieves a low measurement error within ± 0.08 GHz across a wide frequency range from 8 to 50 GHz.