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Ultra-low-noise microwave extraction from fiber-based optical frequency comb
1LNE-SYRTE, Observatoire de Paris, CNRS, UPMC, 61 Avenue de l'Observatoire, Paris, France.
Optics Letters
|December 3, 2009
Summary
Researchers developed an all-optical-fiber method for ultra-low-noise microwave signal generation. This technique achieves unprecedented phase noise using two phase-locked erbium fiber lasers, paving the way for advanced signal processing applications.
Area of Science:
- Physics
- Optical Engineering
- Signal Processing
Background:
- Microwave signal generation traditionally faces limitations in phase noise and stability.
- Optical frequency comb technology offers a path toward higher-performance microwave signals.
Purpose of the Study:
- To demonstrate an all-optical-fiber approach for generating ultra-low-noise microwave signals.
- To achieve unprecedented levels of phase noise and frequency instability in generated microwave signals.
Main Methods:
- Utilizing two erbium fiber mode-locked lasers.
- Phase locking the lasers to a common ultrastable laser source.
- Generating an 11.55 GHz microwave signal from the optical frequency combs.
Main Results:
- Achieved a relative phase noise of -111 dBc/Hz at 1 Hz from the carrier.
- Demonstrated residual frequency instability below 2.3x10(-16) at 1 s.
- Observed residual frequency instability of approximately 4x10(-19) at 6.5x10(4) s after three days of continuous operation.
Conclusions:
- The all-optical-fiber method provides a viable route to ultra-low-noise microwave signal generation.
- The achieved phase noise and frequency instability surpass previous benchmarks.
- This technique has significant implications for applications requiring highly stable microwave signals.
