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Updated: Jan 30, 2026

Generation and Coherent Control of Pulsed Quantum Frequency Combs
Published on: June 8, 2018
Photonics-based reconfigurable multi-band linearly frequency-modulated signal generation
This study presents a novel photonics-based generator for multi-band linearly frequency-modulated (LFM) signals. The system offers reconfigurable center frequency, bandwidth, and duration, significantly enhancing the time-bandwidth product (TBWP).
Area of Science:
- Photonics
- Radio Frequency (RF) Signal Generation
- Optical Signal Processing
Background:
- Traditional RF signal generators face limitations in flexibility and performance.
- Photonics-based approaches offer potential for advanced signal generation.
- Optical frequency combs (OFCs) provide a stable and versatile optical reference.
Purpose of the Study:
- To propose and demonstrate a reconfigurable multi-band photonics-based LFM waveform generator.
- To achieve flexible control over center frequency, bandwidth, and time duration of LFM signals.
- To enhance the time-bandwidth product (TBWP) of generated RF signals.
Main Methods:
- Utilizing two coherent optical frequency combs (OFCs) with frequency shift and different free spectral ranges (FSRs).
- Modulating one OFC with an intermediate-frequency (IF) LFM signal to generate multi-frequency LFM signals.
- Employing time delays and signal combining to create frequency-stepped and bandwidth/duration-multiplied LFM signals.
Main Results:
- Demonstrated generation of LFM signals across L to Ka bands.
- Successfully produced frequency-stepped LFM signals with 10-20 GHz steps.
- Achieved multiplied bandwidth and duration, increasing TBWP by up to N×N (where N is the number of comb lines).
Conclusions:
- The proposed photonics-based generator offers high flexibility and reconfigurability for multi-band LFM signal generation.
- The system enables significant enhancement of the time-bandwidth product (TBWP).
- This technology has potential applications in advanced radar, electronic warfare, and communications systems.
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