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Low latency microwave photonic RTFT processing based on bandwidth slicing and equivalent dispersion.
Optics Letters
|June 15, 2023
Summary
This study presents a novel microwave photonic real-time Fourier transformation (RTFT) technique. It achieves low latency and high frequency resolution for microwave spectrum analysis using bandwidth slicing and equivalent dispersion.
Area of Science:
- Photonics
- Microwave Engineering
- Signal Processing
Background:
- Microwave photonic real-time Fourier transformation (RTFT) is crucial for spectrum analysis.
- Traditional RTFT methods suffer from limited frequency resolution and high processing latency.
Purpose of the Study:
- To demonstrate a low-latency microwave photonic RTFT processing method.
- To overcome the limitations of conventional RTFT techniques in terms of resolution and latency.
Main Methods:
- Utilizing bandwidth slicing to divide the input RF signal into multiple channels.
- Employing a fiber-loop based frequency-to-time mapping with equivalent dispersion for analysis.
- Implementing a 0.44-m fiber-loop to achieve high equivalent dispersion (6 × 10^5 ps/nm).
Main Results:
- Achieved a wide instantaneous bandwidth of 1.35 GHz.
- Obtained a high frequency resolution of approximately 20 MHz.
- Reached a high acquisition frame rate of approximately 450 MHz with a total latency under 200 ns.
Conclusions:
- The proposed method significantly reduces latency in microwave photonic RTFT.
- Bandwidth slicing and equivalent dispersion effectively enhance frequency resolution and acquisition speed.
- This approach offers a promising solution for high-performance microwave spectrum analysis.
