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Balanced optical-microwave phase detectors for optoelectronic phase-locked loops
1Department of Electrical Engineering and Computer Science and Research Laboratory of Electronics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA.
Optics Letters
|November 30, 2006
Summary
This study introduces a novel optical-microwave phase detector that extracts high-quality microwave signals from optical pulses. The device achieves ultra-low timing jitter, ensuring drift-free performance for precise signal regeneration.
Area of Science:
- Optoelectronics
- Microwave Engineering
- Signal Processing
Background:
- Extracting microwave signals from optical pulse trains is crucial for various applications.
- Existing methods often suffer from jitter, drift, and detector nonlinearities.
- A robust and precise phase detection method is needed.
Purpose of the Study:
- To present a balanced optical-microwave phase detector.
- To achieve extraction of low-jitter, high-power, and drift-free microwave signals.
- To demonstrate the robustness of the regenerated microwave signal.
Main Methods:
- Utilizing electro-optic sampling with a differentially biased Sagnac loop.
- Transferring timing information in the optical domain for enhanced stability.
- Experimental implementation and characterization of the phase detector.
Main Results:
- Demonstrated a novel optical-microwave phase detector.
- Achieved ultra-low in-loop relative timing jitter of 3 fs (1 Hz to 10 MHz).
- Validated robustness against drifts and photodetector nonlinearities.
Conclusions:
- The developed phase detector effectively extracts high-quality microwave signals.
- Optical domain timing transfer ensures superior signal stability and reduced jitter.
- The technology holds promise for applications requiring precise microwave signal generation.
