Frequency-tunable microwave generation with parity-time symmetry period-one laser dynamics

Area of Science:

• Optics and Photonics
• Microwave Engineering
• Nonlinear Dynamics

Background:

• Semiconductor lasers are crucial for signal generation.
• Optically injected lasers exhibit complex dynamics like period-one (P1) oscillation.
• Parity-time (PT) symmetry offers unique properties for physical systems.

Purpose of the Study:

• To propose a novel frequency-tunable microwave signal generation method.
• To leverage PT symmetry and P1 laser dynamics for enhanced performance.
• To demonstrate the method's effectiveness in an experimental setup.

Main Methods:

• Incorporating PT symmetry into P1 laser dynamics in an optically injected semiconductor laser.
• Experimental demonstration of the proposed microwave signal generation technique.
• Tuning microwave signal frequency by adjusting optical injection strength.

Main Results:

• Achieved a wide frequency tuning range from 5.07 GHz to 15.22 GHz.
• Demonstrated excellent side-mode suppression ratio (58.4 dB) and low phase noise (-126.2 dBc/Hz at 10 kHz offset).
• Significant improvements in side-mode suppression and phase noise compared to previous methods.

Conclusions:

• The proposed PT symmetry P1 dynamics method enables highly tunable microwave signal generation.
• The method offers superior performance in terms of frequency range, side-mode suppression, and phase noise.
• Potential applications in high-performance wireless communication and radar systems.