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High-Precision Photonics-Assisted Two-Step Microwave Frequency Measurement Combining Time and Power Mapping Method.

Zhangyi Yang1, Zuoheng Liu1, Yuqing Jiang1

  • 1State Key Laboratory on Integrated Optoelectronics, College of Electronic Science and Engineering, Jilin University, Changchun 130012, China.

Sensors (Basel, Switzerland)
|October 16, 2024
PubMed
Summary

This study introduces a novel two-step method for photonics-assisted microwave frequency measurement (MFM). It combines frequency-to-time mapping (FTTM) and frequency-to-power mapping (FTPM) for enhanced precision and real-time performance.

Keywords:
frequency measurementfrequency-to-power mappingfrequency-to-time mappingmicrowave photonics

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Area of Science:

  • Photonics and Microwave Engineering
  • Optical Signal Processing

Background:

  • Photonics-assisted microwave frequency measurement (MFM) offers advantages over electronic methods, including wider bandwidth and electromagnetic interference immunity.
  • Existing methods like frequency-to-time mapping (FTTM) and frequency-to-power mapping (FTPM) have limitations in measurement error, range, and signal type compatibility.

Purpose of the Study:

  • To propose a novel two-step MFM method combining FTTM and FTPM.
  • To achieve a balance between real-time performance, measurement precision, and resolution in MFM.
  • To overcome the limitations of existing FTTM and FTPM techniques.

Main Methods:

  • Utilized high-speed optical sweeping and a stimulated Brillouin scattering (SBS) optical filter for the FTTM step.
  • Employed the FTPM principle with additional sampling points for precise measurement after initial FTTM identification.
  • Integrated FTTM and FTPM in a two-step approach for multi-signal identification and high-precision measurement.

Main Results:

  • Demonstrated a system capable of optical sweeping at 20 GHz/μs within the 1-18 GHz range.
  • Achieved a measurement error of less than 10 MHz.
  • Obtained a frequency resolution of 40 MHz.

Conclusions:

  • The proposed two-step MFM method effectively balances real-time performance with high measurement precision and resolution.
  • This hybrid approach enhances the capability for measuring multiple microwave signals compared to standalone FTTM or FTPM.
  • The method shows significant potential for applications in radar and communication systems requiring accurate microwave frequency measurement.