Multiple microwave frequency measurement system based on a sawtooth-wave-modulated non-flat optical frequency comb.

Area of Science:

• Photonics
• Microwave Engineering
• Signal Processing

Background:

• Accurate and rapid measurement of multiple microwave frequencies is crucial for various applications.
• Existing systems may face limitations in speed, bandwidth, or the ability to handle multiple signals simultaneously.

Purpose of the Study:

• To demonstrate and analyze a novel photonic-assisted instantaneous microwave measurement system.
• To enable the measurement of multiple frequency signals concurrently and with high accuracy.

Main Methods:

• Utilizing a combination of a channelizer and frequency-to-power mapping.
• Proposing an effective generation method for a non-flat optical frequency comb based on sawtooth wave modulation.
• Employing two low-speed post-processing devices for frequency measurements.

Main Results:

• Successful demonstration and simulation-based verification of the photonic measurement system.
• Achieved frequency measurements up to 32 GHz.
• The proposed sawtooth wave modulation method provides more comb lines and adjustable comb spacing for the optical frequency comb.

Conclusions:

• The developed photonic system offers a viable solution for instantaneous, multi-signal microwave frequency measurement.
• The proposed optical frequency comb generation method enhances system flexibility and performance.
• Further analysis of factors affecting system performance was conducted.