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Simple photonics-based microwave frequency and power measurement system.

Chongjia Huang, Helong Zhang, Kun Zhi

|August 13, 2025

Summary

This summary is machine-generated.

This study introduces a microwave photonic system for RF signal analysis. It accurately measures radio frequency (RF) signal frequency and power using a dual-parallel Mach-Zehnder modulator and optical filter.

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Area of Science:

Photonics
Microwave Engineering
Signal Processing

Background:

Accurate measurement of radio frequency (RF) signal parameters is crucial in modern communication systems.
Existing methods for RF signal frequency and power measurement can be complex or limited in range.
Microwave photonic systems offer potential for high-performance signal analysis.

Purpose of the Study:

To present a novel microwave photonic system for simultaneous RF signal frequency and power measurement.
To demonstrate a system with a simple structure, fast response, and wide operating range.
To validate the system's performance through experimental measurements.

Main Methods:

Utilizing a dual-parallel Mach-Zehnder modulator (DP-MZM) and an optical bandpass filter (OBPF).
Employing a sawtooth wave to sweep modulator bias voltage, generating a low-frequency sinusoidal wave post-photodetection.
Measuring the peak voltage and phase of the sinusoidal wave using a gain and phase detector.

Main Results:

Successfully measured RF signal frequencies in the range of 5 to 20 GHz.
Accurately determined RF signal power levels from -10 to 17 dBm.
The system exhibited a simple, compact design with robust performance.

Conclusions:

The proposed microwave photonic system provides an effective solution for RF signal frequency and power measurement.
The system's design offers advantages in terms of simplicity, speed, and operational range.
Experimental validation confirms the system's capability for practical RF signal analysis.