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High-quality frequency-modulated continuous-wave generation based on a semiconductor laser subject to
Optics Express
|October 7, 2021
Summary
This study presents an improved photonic scheme for high-quality frequency-modulated continuous-wave (FMCW) generation using cascade-modulated optical injection. The new method enhances tunability and bandwidth while reducing phase noise for superior FMCW signals.
Area of Science:
- Photonics
- Optical Engineering
- Laser Physics
Background:
- Frequency-modulated continuous-wave (FMCW) generation is crucial for various applications.
- Existing methods using distributed feedback semiconductor lasers (DFB-SLs) with single Mach-Zehnder modulator (MZM) modulation have limitations.
Purpose of the Study:
- To propose and demonstrate an improved photonic scheme for high-quality FMCW generation.
- To enhance the tunability and bandwidth of FMCW signals.
- To reduce phase noise and improve frequency comb contrast.
Main Methods:
- Utilizing a distributed feedback semiconductor laser (DFB-SL) operating at period-one (P1) oscillation.
- Implementing cascade-modulated optical injection with two Mach-Zehnder modulators (MZMs).
- Introducing optical feedback to suppress phase noise.
Main Results:
- The proposed scheme enables widely tunable central frequencies for FMCW signals.
- Achieved a larger modulation bandwidth compared to single MZM modulation.
- Optical feedback significantly improved the frequency comb contrast by suppressing phase noise.
Conclusions:
- The cascade-modulated optical injection scheme offers a superior method for generating high-quality FMCW signals.
- The enhanced system provides wider tunability and bandwidth with reduced phase noise.
- This technique is promising for advanced optical sensing and communication systems.
