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Harmonic active mode-locking optoelectronic oscillator with suppressed supermode noise based on pulse intensity
Optics Letters
|March 1, 2024
Summary
A novel harmonic active mode-locking optoelectronic oscillator (HAML-OEO) uses pulse intensity feedback to generate uniform microwave pulses with suppressed noise. This method achieves tunable repetition rates and enhanced signal quality for advanced applications.
Area of Science:
- Optoelectronics
- Microwave Engineering
- Signal Processing
Background:
- Harmonic active mode-locking optoelectronic oscillators (HAML-OEOs) are crucial for generating high-quality microwave signals.
- Traditional HAML-OEOs often struggle with supermode noise and intensity fluctuations.
- Achieving uniform pulse intensity and suppressed supermode noise simultaneously remains a challenge.
Purpose of the Study:
- To propose and experimentally demonstrate a HAML-OEO with integrated pulse intensity feedback.
- To achieve suppressed supermode noise and uniform pulse intensity in generated microwave pulses.
- To enable tunable repetition rates for versatile microwave signal generation.
Main Methods:
- Utilizing a dual-drive Mach-Zehnder modulator (DDMZM) for simultaneous active mode-locking and pulse intensity feedback.
- Implementing synchronous feedback of generated microwave pulses to the DDMZM.
- Employing 5th- and 10th-order HAML-OEO configurations for experimental validation.
Main Results:
- Successfully generated intensity-equalized microwave pulse trains.
- Achieved tunable repetition rates of 499 kHz and 998 kHz.
- Demonstrated supermode noise suppression ratios exceeding 40 dB.
Conclusions:
- The proposed HAML-OEO with pulse intensity feedback effectively suppresses supermode noise and equalizes pulse intensity.
- The use of DDMZM enables simultaneous mode-locking and feedback for enhanced performance.
- This technique offers a promising approach for generating high-quality, tunable microwave pulses.
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