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High-speed ADC based on photonic time-stretched technology with dispersion-tunable CFBG
Optics Express
|March 2, 2023
Summary
We developed a cost-effective photonic time-stretched analog-to-digital converter (PTS-ADC) using tunable fiber gratings. This system achieves a high equivalent sampling rate of 288 GSa/s for radio frequency signals, enabling multi-channel effects with a single channel.
Area of Science:
- Photonics
- Electrical Engineering
- Signal Processing
Background:
- High-speed analog-to-digital converters (ADCs) are crucial for modern electronic systems.
- Traditional multi-channel ADCs are complex and expensive.
- Photonic time-stretching offers a promising approach for enhanced sampling rates.
Purpose of the Study:
- To propose and demonstrate a cost-effective photonic time-stretched analog-to-digital converter (PTS-ADC).
- To achieve a high equivalent sampling rate using a single channel.
- To enable tunable sampling points for versatile signal acquisition.
Main Methods:
- Utilizing a dispersion-tunable chirped fiber Bragg grating (CFBG) as the core component.
- Implementing a photonic time-stretching technique to increase sampling points.
- Demonstrating tunability of stretch factors from 1.882 to 2.206.
Main Results:
- Achieved seven different stretch factors, equivalent to multiple sampling points.
- Successfully recovered radio frequency (RF) signals from 2 GHz to 10 GHz.
- Increased sampling points by 14.4 times, reaching an equivalent sampling rate of 288 GSa/s.
Conclusions:
- The proposed PTS-ADC offers a low-cost, high-performance solution for high-speed signal acquisition.
- The dispersion-tunable CFBG enables flexible adjustment of sampling characteristics.
- This technology is well-suited for commercial microwave radar systems requiring high sampling rates.
